46 results on '"M. Mezghanni"'
Search Results
2. Novel digital pre-distortion techniques for low-extinction ratio Mach-Zehnder modulators.
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Antonio Napoli, Mahdi M. Mezghanni, Danish Rafique, Vincent A. J. M. Sleiffer, Bernhard Spinnler, and Marc Bohn
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- 2015
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3. Novel DAC digital pre-emphasis algorithm for next-generation flexible optical transponders.
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Antonio Napoli, Mahdi M. Mezghanni, Danish Rafique, Vincent A. J. M. Sleiffer, Talha Rahman, Bernhard Spinnler, Stefano Calabrò, and Marc Bohn
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- 2015
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4. Digital pre-compensation techniques enabling high-capacity bandwidth variable transponders
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Johannes Karl Fischer, Ginni Khanna, Bernhard Spinnler, Lennart Gardian, Stefanos Dris, Bernd Sommerkorn-Krombholz, Pablo Wilke Berenguer, Stefano Calabro, Mahdi M. Mezghanni, Talha Rahman, Antonio Napoli, Anna Chiadò Piat, Emilio Riccardi, Andre Richter, and Publica
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business.industry ,Computer science ,Bandwidth (signal processing) ,Digital-to-analog converter ,High capacity ,02 engineering and technology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,010309 optics ,020210 optoelectronics & photonics ,Optics ,law ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Digital signal ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,Transceiver ,business ,Telecommunications ,Digital signal processing ,Transponder - Abstract
Digital pre-compensation techniques are among the enablers for cost-efficient high-capacity transponders. In this paper we describe various methods to mitigate the impairments introduced by state-of-the-art components within modern optical transceivers. Numerical and experimental results validate their performance and benefits.
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- 2018
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5. Digital Predistortion Techniques for Finite Extinction Ratio IQ Mach–Zehnder Modulators
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Robert Palmer, Stefano Calabro, Guido Saathoff, Mahdi M. Mezghanni, Bernhard Spinnler, and Antonio Napoli
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Polynomial (hyperelastic model) ,Extinction ratio ,business.industry ,02 engineering and technology ,Topology ,Mach–Zehnder interferometer ,Atomic and Molecular Physics, and Optics ,Predistortion ,020210 optoelectronics & photonics ,Optics ,Modulation ,Distortion ,0202 electrical engineering, electronic engineering, information engineering ,Gradient descent ,business ,Quadrature amplitude modulation ,Mathematics - Abstract
We present a digital predistortion (DPD) technique to compensate for in-phase and quadrature (IQ) Mach–Zehnder modulators (MZM) with finite extinction ratio (ER). The proposed method significantly improves the system performance by reducing the impairments introduced by the component imperfections. Our technique is performed in two steps: First, the $\arcsin$ predistorts the nonlinear sinusoidal transfer function of the modulator; second, a constrained optimization method, that utilizes the gradient descent algorithm, predistorts the modulator driving signals, thus mitigating the distortion induced by the finite ER. Since the optimal gradient calculation is rather complex, we introduce a simplified polynomial-based approximation that achieves comparable performance. The DPD gain is assessed via numerical simulations by varying modulation format and ER in an optical back-to-back configuration. The results are presented as required optical signal-to-noise ratio versus the modulator output power ( $\text{P}_{\text{MZM}}$ ) normalized with respect to the MZM input power (continuous wave of the laser, $\text{P}_{\text{CW}}$ ). A considerable improvement is showed when compared to the case without DPD or with the $\arcsin$ module for ERs $\leq$ 20 dB and 32/64QAM.
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- 2017
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6. Digital Compensation of Bandwidth Limitations for High-Speed DACs and ADCs
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Robert Palmer, Maxim Kuschnerov, Antonio Napoli, Mahdi M. Mezghanni, Talha Rahman, Bernhard Spinnler, Marc Bohn, Danish Rafique, Carlos Castro, and Stefano Calabro
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Signal processing ,Computer science ,Successive approximation ADC ,02 engineering and technology ,Delta-sigma modulation ,Noise (electronics) ,Atomic and Molecular Physics, and Optics ,Compensation (engineering) ,020210 optoelectronics & photonics ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Bandwidth (computing) ,Symbol rate ,Quadrature amplitude modulation - Abstract
In this paper, we present a novel digital preemphasis algorithm to compensate for the electrical bandwidth limitations at the transceiver also by taking into account the quantization noise introduced by the signal digitalization. The proposed method is based on the minimization of the mean square error between the desired input signals and the output signals of the digital-to-analog converter/analog-to-digital converter (DAC/ADC), when assuming the knowledge of the DAC/ADC frequency responses. Though this paper focuses on the DAC/ADC compensation, the introduced method could be applied to electrical bandwidth limitations caused by any other component within the transponder. The performance of the algorithm is assessed in optical back-to-back configuration by comparing it against the case without digital preemphasis and with a previously published method to compensate for DAC bandwidth limitations. Our analysis shows that when utilizing realistic descriptions of the DAC/ADC, the proposed digital preemphasis (at the transmitter) or digital compensation (at the transmitter and receiver) can considerably increase the maximum transmittable symbol rate for the case of advanced modulation formats. For example, the maximum symbol rate can be ideally increased up to $\sim$ 60% for the case of 16QAM when employing the high-speed DAC with a $-$ 3 dB electrical bandwidth of $\sim$ 16 GHz and with six effective number of bits. Furthermore, we evaluate the impact of additional noise sources, based on experimental measurements, envisioning potential for further improvements of the digital preemphasis module. Finally, we experimentally verified our algorithm, for the specific case of polarization-multiplexed 16QAM, showing a considerable match between simulation and lab results.
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- 2016
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7. Depression screening in primary care patients
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Mouna Turki, N. Charfi, J. Ben Thabet, N. Zouari, M. Mezghanni, M. Maalej, S. Omri, M. Maalej Bouali, and Lobna Zouari
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medicine.medical_specialty ,Suicide attempt ,business.industry ,Beck Depression Inventory ,Primary care ,Depression screening ,Psychiatry and Mental health ,Antidepressant ,Medicine ,School level ,business ,Psychiatry ,Depression (differential diagnoses) ,Social functioning - Abstract
IntroductionDepression is a common mental disorder that can be associated with more functional disability than most chronic medical illnesses and the increased reporting of medically unexplained somatic symptoms.AimTo assess the prevalence of depression in a Tunisian population, as well as the associated factors.MethodsWe conducted a cross-sectional, descriptive and analytic study, among 707 subjects consulting in 20 primary care units in Sfax and Tunis, Tunisia. These participants, randomly chosen, were asked to answer a questionnaire after their consent. Depressive symptoms were evaluated using the “Beck Depression Inventory” (BDI).ResultsThe mean age of participants was 39.84 years. Among them, 38.6% had a low educational level (illiterate or primary school level); 45.3% were professionally inactive and 92.9% had a low to medium socio economic level. Medical, psychiatric and suicide attempt histories were reported respectively in 51.2%, 7.6% and 1.8% of cases. According to BDI, a mild depression was noted in 22.9%; moderate 16.1%; severe 4.1%. Among those presenting a moderate to severe depression (MSD), only 16.8% were followed up in psychiatry, 4.2% were receiving antidepressant and 9.8% benzodiazepine. MSD was associated with low educational level (P < 0.001); low to medium socio economic level (P < 0.001); psychiatric histories (P < 0.001); suicide attempt histories (P < 0.001); somatic histories (P < 0.001).ConclusionOur study highlighted a high prevalence of depression that is still under diagnosed and therefore poorly managed. General practitioners should be made aware of the importance of screening for depression in medical patients because it not only complicates their overall medical treatments, but also impedes their physical and social functioning.Disclosure of interestThe authors have not supplied their declaration of competing interest.
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- 2017
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8. Apport de l’arthrodistension dans la prise en charge de la capsulite rétractile primitive de l’épaule : étude comparative versus rééducation
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O. Kharrat, S. Ghroubi, M H Elleuch, M Mezghanni, A. Yahia, and K. Ayedi
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medicine.medical_specialty ,Rehabilitation ,business.industry ,Visual analogue scale ,medicine.medical_treatment ,General Medicine ,Distension ,medicine.disease ,Surgery ,Capsulitis ,medicine.anatomical_structure ,Severity of illness ,Medicine ,Orthopedics and Sports Medicine ,Shoulder joint ,Functional ability ,business ,Prospective cohort study - Abstract
OBJECTIVES To describe the epidemiological and clinical features of patients with primitive adhesive capsulitis of the shoulder treated by capsular distension and then rehabilitation; to evaluate the short-, mid- and long-term efficiency of this therapeutic protocol and compare it with rehabilitation alone. MATERIALS AND METHODS This was a two-year prospective study. Sixty patients were included and divided into populations P1 (capsular distension and rehabilitation) and P2 (rehabilitation only). Assessment of the treatments' efficacy was based on the following parameters: pain on a visual analogue scale (VAS), joint motion in several axes, a simplified Constant score (functional ability) and the SF-36 quality of life score. RESULTS Thirty patients (mean age: 56) underwent capsular distension. The Constant score was judged to be poor in over half of the patients. All the quality of life parameters were modified. When compared with P2, the P1 group showed a statistically significant improvement in terms of the pain score (p=0.005), anterior elevation (p=0.001), lateral elevation (p=0.005), external rotation (p=0.006) and the Constant score (p
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- 2008
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9. Knee osteoarthritis in 50 former top-level footballers: A comparative (control group) study
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Sameh Ghroubi, S. Baklouti, H. Fki, M. Mezghanni, S. Mefteh, M.H. Elleuch, S. Sellami, and M. Guermazi
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medicine.medical_specialty ,Cross-sectional study ,business.industry ,Visual analogue scale ,Rehabilitation ,Traumatology ,General Medicine ,Football ,Osteoarthritis ,medicine.disease ,Arthropathy ,Physical therapy ,Medicine ,Left axis deviation ,Orthopedics and Sports Medicine ,business ,human activities ,Body mass index - Abstract
Objectives To study the prevalence of knee osteoarthritis in a group of former top-level football players and to assess the condition's impact on joint function and structure, compared with a control group. Materials and methods A cross-sectional, descriptive study was performed on a group of male former top-level football players (group G1), aged over 45 and with no history of knee trauma, arthritis, arthropathy or surgery. A second group of otherwise matched nonsporting subjects (group G2) was compared with the first group. For each subject, we specified age, weight, height, body mass index (BMI), dominant foot, the presence of knee axis deviation, the presence of pain and functional impairment. The pain level was assessed using a visual analogue scale (VAS). The functional assessment was performed using the Arabic version of the Lequesne index. Moreover, for each former player, we specified a number of sporting parameters, including those related to their playing career. The diagnosis of knee osteoarthritis was made using standard radiological and clinical criteria. The radiological severity of knee osteoarthritis was assessed using the Kellgren and Lawrence classification. We compared the two groups in terms of the frequency of knee osteoarthritis, the severity of pain and disability and the severity of structural impairment. Results Our study included two groups of patients: a group of 50 former football players (G1) with a mean age of 49.2. Overweight was noted in 40 subjects. The mean number of training hours a week was 14 ± 3.5 during their professional career and 2.5 during their retirement. Half of the sportsmen had taken part in more than 200 matches. Knee axis deviation was observed in 29 former players (i.e. 58% of the cases) and 27 displayed genuvarum. A group of 50 nonsporting volunteers (G2) was matched to the G1 group in terms of age, BMI and frequency of axis deviation. Knee osteoarthritis was more common in the football players than in the nonsporting subjects (80% versus 68%), although the difference was not statistically significant. Whereas pain was noted in only six footballers (with an average VAS score of 25.4 ± 6.3 mm) and was observed in 50% of controls (with a mean VAS score of 39.2 mm ± 7.3) (P = 0.001). Disability was recorded in six sportsmen, with a mean Lequesne score of 0.38 ± 1.27. Disability was more frequent (23 subjects) and more intense (with a mean Lequesne score of 1.71 ± 3.2) in the nonsportsmen (P = 0.001). The Kellgreen and Lawrence radiological classification revealed that 57.5% of the sportsmen had scores of III or IV, compared with just 29.4% in the control group. Conclusion Knee osteoarthritis is common in male football players. However, our study shows that the condition is less painful and less likely to cause functional disability (but paradoxically more destructive) than in nonsportsmen.
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- 2008
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10. L’arthrose du genou chez des anciens footballeurs de haut niveau (à propos de 50 cas)
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H. Fki, M.H. Elleuch, S. Baklouti, S. Sellami, S. Mefteh, M. Guermazi, M. Mezghanni, and Sameh Ghroubi
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Rehabilitation ,Orthopedics and Sports Medicine ,General Medicine - Abstract
Resume Objectifs Etudier la prevalence de la gonarthrose chez un groupe d’anciens footballeurs de haut niveau et evaluer son retentissement algofonctionnel et structural en le comparant a un groupe temoin. Materiel et methodes Etude descriptive transversale effectuee aupres d’un groupe d’anciens footballeurs de haut niveau (G1), de sexe masculin, âges de plus de 45 ans, sans antecedents de traumatisme, d’arthrite ou d’arthropathie et de chirurgie du genou. Un deuxieme groupe de sujets non sportifs (G2), comparable au premier a servi pour l’etude comparative. Pour chaque sujet, nous avons precise l’âge, le poids, la taille, l’indice de masse corporelle (IMC), le cote dominant, l’existence d’une deformation axiale des genoux, l’existence d’une douleur et l’eventuel retentissement fonctionnel. L’evaluation de la douleur a repose sur l’echelle visuelle analogique (EVA Dl). L’evaluation de la fonction a ete effectuee a l’aide de la version arabe de l’indice de Lequesne. Par ailleurs, nous avons precise pour chaque ancien joueur des parametres concernant leur parcours sportif. Le diagnostic de gonarthrose a ete porte sur des criteres cliniques et radiologiques standard. La severite radiologique de la gonarthrose a ete evaluee par la classification de Kellgreen et Lawrence. La comparaison entre les deux groupes a porte sur la frequence de la gonarthrose, l’importance de la douleur, l’impact sur la fonction, ainsi que la gravite de l’atteinte structurale. Resultats Dans le premier groupe de 50 anciens footballeurs de haut niveau (G1), dont l’âge moyen est de 49,2 ans, un surpoids a ete retrouve chez 40 sujets, une deformation axiale a ete observee chez 29 sujets (58 % des cas), dont 27 genuvarum. Tous les sujets etaient des footballeurs de haut niveau. Le nombre d’heures d’entrainement par semaine a ete en moyenne de 14 heures et 3,5 (limites neuf a 18 heures) pendant la periode professionnelle et en moyenne de deux heures et demi a la periode de la retraite. La moitie des sportifs ont participe a plus de 200 competitions. Le groupe de 50 volontaires non sportifs (G2) est comparable au precedent du point de vue de l’âge, IMC et frequence des deformations axiales. La gonarthrose a ete plus frequente chez les sportifs que les sujets non sportifs (80 % contre 68 %) sans que la difference soit statistiquement significative. La douleur a ete notee chez seulement six footballeurs avec une EVA Dl moyenne de 25,4 et 6,3 mm alors qu’elle a ete presente chez 50 % des temoins avec une EVA Dl moyenne de 39,2 mm et 7,3 (p = 0,01). Un retentissement fonctionnel a ete objective chez six sujets sportifs avec un score moyen de Lequesne de 0,38 + 1,27. Ce retentissement a ete observe chez 23 sujets du G2 avec un score moyen de 1,71 + 3,2 (p = 0,001). La classification radiologique de Laurence et Kellgreen trouve un stade III et IV dans 57,5 % des sujets sportifs contre 29,4 % chez le groupe temoin (p = 0,05). Conclusion La gonarthrose chez le footballeur de sexe masculin est frequente. Notre etude montre qu’elle est moins douloureuse et moins pourvoyeuse d’incapacite fonctionnelle que chez les hommes non sportifs. Paradoxalement, elle est plus destructrice sur le plan structural.
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- 2008
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11. Novel digital pre-distortion techniques for low-extinction ratio Mach-Zehnder modulators
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Mahdi M. Mezghanni, Antonio Napoli, Bernhard Spinnler, Marc Bohn, Vincent A. J. M. Sleiffer, and Danish Rafique
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Physics ,Optics ,Optical modulator ,Transmission (telecommunications) ,Extinction ratio ,Extinction (optical mineralogy) ,business.industry ,Modulation ,Electro-optic modulator ,Optical modulation amplitude ,business ,Mach–Zehnder interferometer ,GeneralLiterature_MISCELLANEOUS - Abstract
A novel digital pre-distortion technique for low-extinction ratio modulators is presented. Penalty-free transmission in back-to-back system configuration is reported for 16- and 64QAM at 32GBaud with modulator extinction ratios as low as 14dB.
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- 2015
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12. Novel DAC digital pre-emphasis algorithm for next-generation flexible optical transponders
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Stefano Calabro, Bernhard Spinnler, Vincent A. J. M. Sleiffer, Danish Rafique, Mahdi M. Mezghanni, Marc Bohn, Talha Rahman, Antonio Napoli, and Electro-Optical Communication
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Quadrature modulation ,Analog transmission ,Computer science ,Bandwidth (signal processing) ,Emphasis (telecommunications) ,Optical modulation amplitude ,Delta-sigma modulation ,Pulse-amplitude modulation ,Electronic engineering ,Symbol rate ,Pulse-density modulation ,Algorithm ,Modulation error ratio ,Quadrature amplitude modulation - Abstract
We present a novel digital pre-emphasis algorithm based on the mean-square-error. We numerically demonstrate a significant increase of the maximum transmittable symbol rate for 4- up to 64QAM and experimentally, a ~ 0.7dBQ-gain for 40GBaud-16QAM.
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- 2015
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13. Suivi à long terme des épaules paralytiques obstétricales (à propos de 129 cas)
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M.H. Elleuch, Sameh Ghroubi, F.E Triki, M. Guermazi, and M. Mezghanni
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Gynecology ,medicine.medical_specialty ,business.industry ,Rehabilitation ,medicine ,Orthopedics and Sports Medicine ,General Medicine ,business - Abstract
Resume Objectifs. – Etudier le retentissement de la paralysie obstetricale du plexus brachial sur l’epaule en terme de deficience et d’incapacite, son evolution sous traitement, ainsi que les principales sequelles, leur exploration et leur prise en charge. Materiels et methodes. – Il s’agit d’une etude retrospective ayant porte sur 129 patients (66 garcons et 63 filles) suivis au service de medecine physique et reeducation fonctionnelle du CHU Habib-Bourguiba de Sfax entre 1991 et 2000. L’evaluation des deficiences de l’epaule a ete fondee sur la cotation des muscles deltoide, biceps et les rotateurs externes de l’epaule ainsi que sur l’etude des mobilites passives. La classification de Mallet a ete adoptee pour l’evaluation fonctionnelle. Resultats. – L’analyse des resultats tous patients confondus montre une recuperation spontanee complete du deltoide et du biceps dans environ trois quarts des cas a 12 mois d’evolution et des rotateurs externes seulement dans 45 % des cas. Sur le plan fonctionnel et avec un recul moyen de 3,5 ans, 77 % des enfants ont recupere un stade superieur ou egal a III de J. Mallet (20 % stade V ; 32 % stade IV, 25 % stade III). Le suivi a long terme a permis de deceler une limitation de la rotation externe passive inferieure a 20 degres chez 15 patients. Une exploration par IRM ou arthroscanner a ete realisee pour cinq patients, elle a permis de deceler une deformation avec subluxation de la tete humerale dans deux cas. Dix enfants ont ete operes (liberation du sous-scapulaire 9 cas associes a un transfert tendineux 6 fois. Osteotomie humerale dans 1 cas). Cette chirurgie a permis l’amelioration de l’etat fonctionnel dans tous les cas. Conclusion. – L’apparition de sequelles au niveau de l’epaule est assez frequente, la retraction du plan anterieur de l’epaule aboutit a la limitation de la rotation externe et peut a long terme entrainer des deformations de la tete humerale. Les auteurs insistent sur l’importance de pousser les investigations en cas de limitation de la rotation externe passive afin de mieux orienter le choix therapeutique.
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- 2004
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14. RETRACTED: Alexithymia and alcohol use disorders: A critical review
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A. Belkhiria, F. Ghali, M. Mezghanni, I. Khemiri, F. Fekih Romdhane, G. Jmii, M. Zghal, R. Ridha, L. Jouini, and I. Ghazeli
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medicine.medical_specialty ,media_common.quotation_subject ,Alcohol dependence ,medicine.disease ,Psychiatry and Mental health ,Feeling ,Alexithymia ,medicine ,Personality ,Risk factor ,medicine.symptom ,Psychology ,Construct (philosophy) ,Psychiatry ,Suicidal ideation ,media_common ,Clinical psychology ,Cognitive style - Abstract
Introduction Alexithymia is a multifaceted construct that was first described by Sifneos as difficulty identifying and communicating feelings, differentiating feelings and somatic sensations of emotional arousal, a diminution of fantasy and imagination and an externally oriented cognitive style. Between 45–67% of alcohol dependent individuals have been identified as alexithymic. Aims and methodology The aim of this study is to review the published research on alexithymia and alcohol use, to present a critical update on the relationship between alexithymia and alcohol use disorders. Results Research studies have shown high prevalence rates of alexithymia in alcohol dependent populations, yet there is only preliminary evidence to indicate relationships between alexithymia, alcohol consumption and severity of alcohol problems, and limited evidence examining the different dimensions of alexithymia in relation to alcohol dependence. Hence, the notion that alexithymia is a vulnerability factor in the development and maintenance of alcohol use disorders is premature. Despite limited support for a relationship between alexithymia and alcohol dependence, several studies have examined alexithymia in association with other risk factors for alcohol use including attachment, depression, personality disorder traits, emotional and perceptual dependency and suicidal ideation. Conclusion A number of key issues need to be addressed in examining the veracity of the link between alexithymia and alcohol dependence. Although, alexithymia is often considered a risk factor for the development of alcohol use disorders, there is little evidence to support this notion. Given that alexithymia may have the potential to interfere with treatment outcomes, a better understanding of the role of alexithymia in alcohol use is needed.
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- 2017
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15. Generalized anxiety disorder comorbidities: Panic and depressive disorder
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Mouna Turki, N. Zouari, Lobna Zouari, M. Mezghanni, M. Maalej Bouali, J. Ben Thabet, N. Charfi, and M. Maalej
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medicine.medical_specialty ,Generalized anxiety disorder ,Suicide attempt ,Panic disorder ,Beck Depression Inventory ,Panic ,medicine.disease ,Psychiatry and Mental health ,Mood disorders ,medicine ,medicine.symptom ,Psychiatry ,Psychology ,Depression (differential diagnoses) ,Clinical psychology ,Mini-international neuropsychiatric interview - Abstract
IntroductionIt has been well documented that generalized anxiety disorder (GAD) can co-occur with mood disorders and other anxious disorders, particularly panic disorder (PD). These comorbidities can complicate therapeutic management and burden the prognosis.AimTo highlight the relationship between GAD and panic and depressive disorders.MethodsWe conducted a cross-sectional study, among 250 subjects consulting in 6 primary care units in Sfax, Tunisia. These participants, randomly chosen, were asked to answer a questionnaire after their consent. The diagnosis of GAD and PD were assessed by the “Mini International Neuropsychiatric Interview” of the DSM-IV. Depressive symptoms were evaluated using the “Beck Depression Inventory” (BDI).ResultsThe average age was 39 years. The sex ratio M/F was 1/2.The GAD was diagnosed in 10.8% of participants. The mean IDB score was 3.8. According to this scale, a mild depression was noted in 23.6%, moderate 12% and severe in 2.8% of cases. The GAD was statistically associated with psychiatric histories (P = 0.009), particularly depression disorder (P = 0.004) and the history of suicide attempt (P < 0.001).The IDB score was significantly higher in participants with GAD (P < 0.001). Among them, 74% presented moderate to severe depression.GAD co-occurs with PD in 22.2% of cases. This association was statistically significant (P < 0.001). Participants presenting GAD- PD comorbidity are at higher risk of developing depression (P = 0.003).ConclusionOne must always think to screen comorbidities in the presence of either diagnosis, in order to ensure a better management.Disclosure of interestThe authors have not supplied their declaration of competing interest.
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- 2017
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16. On the next generation bandwidth variable transponders for future flexible optical systems
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Danish Rafique, Marc Bohn, Bernhard Spinnler, Johannes Karl Fischer, Mahdi M. Mezghanni, Talha Rahman, Markus Nolle, Antonio Napoli, and Electro-Optical Communication
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Upgrade ,Transmission (telecommunications) ,business.industry ,Modulation ,Computer science ,Key (cryptography) ,Bandwidth (computing) ,Electronic engineering ,Internet traffic ,Optical performance monitoring ,business ,Computer network ,Frequency allocation - Abstract
Elastic optical networks represent one of the most promising candidates for the imminent upgrade of current fixed-grid based optical systems. This novel architecture based on high efficient spectrum allocation (i.e. higher capacity), is necessary to cope with foreseen future exponential increase of Internet traffic. This work discusses the influence of hardware components on the transmission performance of recently proposed bandwidth variable transponders employing digital signal processing algorithms. Both are key elements for the realization of future elastic optical networks, and only their successful interplay with coherent detection can enable the transmission of different modulation formats at variable symbol and data-rates over flexible links. We evaluate the performance of such transponders when different modulation schemes are generated employing ideal and realistic values for some key hardware components. Finally, we briefly present a couple of examples of mitigation techniques: namely digital pre-distortion and digital back-propagation.
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- 2014
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17. [The contribution of capsular distension to the treatment of primary adhesive capsulitis of the shoulder: a comparative study versus rehabilitation]
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M H, Elleuch, A, Yahia, S, Ghroubi, O, Kharrat, M, Mezghanni, and K, Ayedi
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Male ,Shoulder Joint ,Middle Aged ,Sodium Chloride ,Dilatation ,Severity of Illness Index ,Injections, Intra-Articular ,Treatment Outcome ,Bursitis ,Shoulder Pain ,Quality of Life ,Humans ,Female ,Prospective Studies ,Anesthetics, Local ,Pregnatrienes ,Joint Capsule ,Physical Therapy Modalities ,Pain Measurement - Abstract
To describe the epidemiological and clinical features of patients with primitive adhesive capsulitis of the shoulder treated by capsular distension and then rehabilitation; to evaluate the short-, mid- and long-term efficiency of this therapeutic protocol and compare it with rehabilitation alone.This was a two-year prospective study. Sixty patients were included and divided into populations P1 (capsular distension and rehabilitation) and P2 (rehabilitation only). Assessment of the treatments' efficacy was based on the following parameters: pain on a visual analogue scale (VAS), joint motion in several axes, a simplified Constant score (functional ability) and the SF-36 quality of life score.Thirty patients (mean age: 56) underwent capsular distension. The Constant score was judged to be poor in over half of the patients. All the quality of life parameters were modified. When compared with P2, the P1 group showed a statistically significant improvement in terms of the pain score (p=0.005), anterior elevation (p=0.001), lateral elevation (p=0.005), external rotation (p=0.006) and the Constant score (p0.001) one week after capsular distension. One year after capsular distension, this gain persisted in a statistically significant manner for all functional parameters and all SF-36 dimensions (p0.001 for PF, RP, BP, SF and RE; p=0.01 for GH and VT and p=0.002 for MH).Our results show that capsular distension and subsequent intensive rehabilitation have a beneficial effect. This combination enables rapid, significant improvement from the first week onwards. The improvement phase lasts for one month and may hold steady for up to 12 months.
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- 2008
18. [Knee osteoarthritis in 50 former top-level soccer players: a comparative study]
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M H, Elleuch, M, Guermazi, M, Mezghanni, S, Ghroubi, H, Fki, S, Mefteh, S, Baklouti, and S, Sellami
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Male ,Disability Evaluation ,Cross-Sectional Studies ,Tunisia ,Case-Control Studies ,Soccer ,Humans ,Middle Aged ,Osteoarthritis, Knee ,Pain Measurement - Abstract
To study the prevalence of knee osteoarthritis in a group of former top-level football players and to assess the condition's impact on joint function and structure, compared with a control group.A cross-sectional, descriptive study was performed on a group of male former top-level football players (group G1), aged over 45 and with no history of knee trauma, arthritis, arthropathy or surgery. A second group of otherwise matched nonsporting subjects (group G2) was compared with the first group. For each subject, we specified age, weight, height, body mass index (BMI), dominant foot, the presence of knee axis deviation, the presence of pain and functional impairment. The pain level was assessed using a visual analogue scale (VAS). The functional assessment was performed using the Arabic version of the Lequesne index. Moreover, for each former player, we specified a number of sporting parameters, including those related to their playing career. The diagnosis of knee osteoarthritis was made using standard radiological and clinical criteria. The radiological severity of knee osteoarthritis was assessed using the Kellgren and Lawrence classification. We compared the two groups in terms of the frequency of knee osteoarthritis, the severity of pain and disability and the severity of structural impairment.Our study included two groups of patients: a group of 50 former football players (G1) with a mean age of 49.2. Overweight was noted in 40 subjects. The mean number of training hours a week was 14+/-3.5 during their professional career and 2.5 during their retirement. Half of the sportsmen had taken part in more than 200 matches. Knee axis deviation was observed in 29 former players (i.e. 58% of the cases) and 27 displayed genuvarum. A group of 50 nonsporting volunteers (G2) was matched to the G1 group in terms of age, BMI and frequency of axis deviation. Knee osteoarthritis was more common in the football players than in the nonsporting subjects (80% versus 68%), although the difference was not statistically significant. Whereas pain was noted in only six footballers (with an average VAS score of 25.4+/-6.3mm) and was observed in 50% of controls (with a mean VAS score of 39.2mm+/-7.3) (P=0.001). Disability was recorded in six sportsmen, with a mean Lequesne score of 0.38+/-1.27. Disability was more frequent (23 subjects) and more intense (with a mean Lequesne score of 1.71+/-3.2) in the nonsportsmen (P=0.001). The Kellgreen and Lawrence radiological classification revealed that 57.5% of the sportsmen had scores of III or IV, compared with just 29.4% in the control group.Knee osteoarthritis is common in male football players. However, our study shows that the condition is less painful and less likely to cause functional disability (but paradoxically more destructive) than in nonsportsmen.
- Published
- 2007
19. [A long-term follow up of the shoulder in obstetrical brachial palsy]
- Author
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M, Guermazi, S, Ghroubi, M, Mezghanni, F E, Triki, and M H, Elleuch
- Subjects
Male ,Shoulder Joint ,Remission, Spontaneous ,Infant, Newborn ,Joint Dislocations ,Infant ,Child, Preschool ,Birth Injuries ,Humans ,Female ,Range of Motion, Articular ,Shoulder Injuries ,Brachial Plexus Neuropathies ,Physical Therapy Modalities ,Follow-Up Studies - Abstract
To study shoulder impairment and disability caused by obstetrical brachial plexus palsy, their evolution under physical and surgical treatments, and the place of complementary explorations in persistent sequels.From 1991 to 2000, 129 patients (66 M, 63 F) were included in a retrospective study. Impairment was assessed by muscle recovery (deltoid, biceps, external rotators) and shoulder passive motion. Disability was assessed by Mallet functional test.Full spontaneous recovery was noted in 20% of patients before the age of 3 months. Repair of the nerve lesion was undertaken in four children between the 18th and 24th months. Full recovery of deltoid and biceps was noted in three-fourth of whole cases before the 12th month, and of the external rotation in only 45% at this same age. Seventy-seven percent of patients showed stageor= III of Mallet test (VI: 20%, IV: 32%; III: 25%) at a middle age of 3.5 years. A long-term follow-up showed an external rotation limited less than 20 degrees in 15 children. Investigation by RMN or Arthroscanner was realized for five patients, this reveals a deformation with subluxation of the humeral head in two cases. Ten children were operated (liberation of sub-scapula in nine cases associated to a tendinous transfer six times; humeral osteotomie in one case). This surgery has allowed the improvement of the functional state in all cases.After-effects in shoulder are frequent especially the limitation of external rotation, which can lead to a deformation, and subluxation of the humeral head. The authors insist on the importance to push investigations in case of limitation of the passive external rotation to improve the therapeutic choice.
- Published
- 2003
20. [Achilles tendon rupture in athletes. Ten cases]
- Author
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I, Ghattassi, M H, Kammoun, L, Bellaaj, M, Mezghanni, and M H, Elleuch
- Subjects
Adult ,Male ,Rupture ,Patient Selection ,Middle Aged ,Achilles Tendon ,Causality ,Treatment Outcome ,Activities of Daily Living ,Athletic Injuries ,Humans ,Range of Motion, Articular ,Physical Therapy Modalities ,Follow-Up Studies - Published
- 2000
21. [Epicondylitis in 35 amateur athletes]
- Author
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I, Ghattassi, M, Mezghanni, S, Baklouti, and M H, Elleuch
- Subjects
Adult ,Male ,Adolescent ,Anti-Inflammatory Agents ,Tennis Elbow ,Middle Aged ,Biomechanical Phenomena ,Treatment Outcome ,Risk Factors ,Athletic Injuries ,Humans ,Female ,Steroids ,Child ,Physical Therapy Modalities - Published
- 2000
22. [Strangulation of glans penis by hair or 'penis tourniquet syndrome']
- Author
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M N, Mhiri, H, Midassi, M, Mezghanni, and M L, Smida
- Subjects
Male ,Tunisia ,Circumcision, Male ,Child, Preschool ,Humans ,Child Abuse ,Syndrome ,Tourniquets ,Child ,Prognosis ,Penis - Abstract
The authors report 5 cases of strangulation of the penis with hair in children. This affection, more seen frequently within socially disadvantaged children, needs early diagnosis and treatment because it may be responsible for glans amputation. A better knowledge of this accident by parents and physicians might prevent this barbaric aggression.
- Published
- 1987
23. Vesico-vaginal fistula induced by an intravesical foreign body
- Author
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S Rekik, A Amous, M. L. Smida, M. N. Mhiri, and M. Mezghanni
- Subjects
Adult ,medicine.medical_specialty ,Urinary Bladder Calculi ,Vesicovaginal Fistula ,business.industry ,Urology ,medicine.disease ,Foreign Bodies ,Vesicovaginal fistula ,Surgery ,Vesico-Vaginal Fistula ,medicine.anatomical_structure ,Vagina ,Medicine ,Humans ,Urinary Bladder Calculus ,Female ,Foreign body ,business - Published
- 1988
24. Genome sequence and Carbohydrate Active Enzymes (CAZymes) repertoire of the thermophilic Caldicoprobacter algeriensis TH7C1 T .
- Author
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Ameri R, García JL, Derenfed AB, Pradel N, Neifar S, Mhiri S, Mezghanni M, Jaouadi NZ, Barriuso J, and Bejar S
- Subjects
- Base Composition, Clostridiales, Phylogeny, RNA, Ribosomal, 16S, Sequence Analysis, DNA, Polysaccharides metabolism
- Abstract
Background: Omics approaches are widely applied in the field of biology for the discovery of potential CAZymes including whole genome sequencing. The aim of this study was to identify protein encoding genes including CAZymes in order to understand glycans-degrading machinery in the thermophilic Caldicoprobacter algeriensis TH7C1
T strain., Results: Caldicoprobacter algeriensis TH7C1T is a thermophilic anaerobic bacterium belonging to the Firmicutes phylum, which grows between the temperatures of 55 °C and 75 °C. Next generation sequencing using Illumina technology was performed on the C. algeriensis strain resulting in 45 contigs with an average GC content of 44.9% and a total length of 2,535,023 bp. Genome annotation reveals 2425 protein-coding genes with 97 ORFs coding CAZymes. Many glycoside hydrolases, carbohydrate esterases and glycosyltransferases genes were found linked to genes encoding oligosaccharide transporters and transcriptional regulators; suggesting that CAZyme encoding genes are organized in clusters involved in polysaccharides degradation and transport. In depth analysis of CAZomes content in C. algeriensis genome unveiled 33 CAZyme gene clusters uncovering new enzyme combinations targeting specific substrates., Conclusions: This study is the first targeting CAZymes repertoire of C. algeriensis, it provides insight to the high potential of identified enzymes for plant biomass degradation and their biotechnological applications., (© 2022. The Author(s).)- Published
- 2022
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25. Stress, craving and mood as predictors of early dropout from opioid agonist therapy.
- Author
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Panlilio LV, Stull SW, Kowalczyk WJ, Phillips KA, Schroeder JR, Bertz JW, Vahabzadeh M, Lin JL, Mezghanni M, Nunes EV, Epstein DH, and Preston KL
- Subjects
- Adult, Analgesics, Opioid therapeutic use, Buprenorphine, Naloxone Drug Combination therapeutic use, Ecological Momentary Assessment, Female, Humans, Male, Methadone therapeutic use, Middle Aged, Opioid-Related Disorders drug therapy, Withholding Treatment, Affect drug effects, Craving drug effects, Opiate Substitution Treatment adverse effects, Opioid-Related Disorders psychology, Patient Dropouts psychology, Stress, Psychological chemically induced
- Abstract
Background: Treatment with opioid agonists is effective for opioid use disorder, but early discontinuation of treatment is a major obstacle to success. Intensive longitudinal methods - which take many repeated measurements over time, usually in the field- have provided unique insight into the effects of stress, mood and craving on drug use while people are being treated; these methods might also be useful for studying the processes that lead people to drop out of treatment., Methods: Ecological momentary assessment (EMA) was conducted for up to 17 weeks by obtaining multiple electronic diary entries per day from 238 participants being treated with methadone or buprenorphine-naloxone. Survival analysis was used to study two outcomes: dropping out of treatment and noncompliance with EMA self-report requirements. Self-reports of stress, craving, and mood were used as time-varying predictors. Demographic and psychosocial variables measured with the Addiction Severity Index at the start of treatment were used as time-invariant predictors., Results: Dropping out of treatment was more likely in participants with more reported hassles (a measure of stress), higher levels of cocaine craving, lower levels of positive mood, a recent history of emotional abuse, a recent history of being bothered frequently by psychological problems, and with buprenorphine rather than methadone as their medication. In contrast, study noncompliance was not significantly associated with any of the variables analyzed., Conclusions: Assessment of stress, craving and mood during treatment might identify people who are at greater risk of dropping out, and therapeutic interventions targeting these processes might increase retention., (Published by Elsevier B.V.)
- Published
- 2019
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- View/download PDF
26. [Epidemiological and prognostic profile of acute heart failure: experience in the emergency department at the Charles Nicole Hospital of Tunis from 2013 to 2014].
- Author
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Jouini S, Manai H, Slimani O, Hedhli H, Hebaieb F, Mezghanni M, Aloui A, and Kaddour RB
- Subjects
- Acute Coronary Syndrome epidemiology, Acute Disease, Adult, Aged, Aged, 80 and over, Diuretics administration & dosage, Emergency Service, Hospital, Female, Heart Failure physiopathology, Heart Failure therapy, Humans, Hypertension epidemiology, Male, Middle Aged, Nitrates administration & dosage, Prognosis, Prospective Studies, Recurrence, Tunisia, Young Adult, Acute Coronary Syndrome complications, Continuous Positive Airway Pressure methods, Heart Failure epidemiology, Hypertension complications
- Abstract
Introduction: Acute Heart Failure (AHF) is a specific syndromic disorder grouping several heterogeneous clinical conditions frequently seen in the emergency department. This study aimed to describe the epidemiological, clinical, therapeutic and prognostic features of patients with AHF admitted to the emergency department., Methods: We conducted a prospective, descriptive study in the emergency department. It included all patients admitted with AHF. We studied the epidemiological, clinical, therapeutic and prognostic features of these patients., Results: The study enrolled 180 patients with AHF admitted to the emergency department. Sex ratio was 1.27. The average age of patients was 66±12 years. Eighty-two percent of patients were hypertensive and 69% were known diabetic patients. The causes of decompensation included primarily hypertensive crisis (61.7% of patients), acute coronary syndrome (24% of patients). Respiratory support was mainly provided by CPAP (Continuous Positive Airway Pressure) in 73.3% of cases. Pharmacological treatment was based on nitrate derivatives (70% of cases) and diuretic (40.5% of cases). Acute heart failure incidence at one month was 21.7% (n=39 patients) and mortality rate at 3 months was 13.3%., Conclusion: Patients with AHF treated in the emergency department mainly had hypertensive crisis. Treatment is primarily based on CPAP, vasodilators and diuretics. Recurrence rate and mortality rate were high., Competing Interests: Les auteurs ne déclarent aucun conflit d'intérêts., (© Sarra Jouini et al.)
- Published
- 2019
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27. End-of-day reports of daily hassles and stress in men and women with opioid-use disorder: Relationship to momentary reports of opioid and cocaine use and stress.
- Author
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Preston KL, Schroeder JR, Kowalczyk WJ, Phillips KA, Jobes ML, Dwyer M, Vahabzadeh M, Lin JL, Mezghanni M, and Epstein DH
- Subjects
- Adolescent, Adult, Affect, Aged, Cigarette Smoking epidemiology, Ecological Momentary Assessment, Female, Humans, Male, Maryland epidemiology, Middle Aged, Outpatients, Smartphone, Surveys and Questionnaires, Young Adult, Cocaine-Related Disorders epidemiology, Drug Users psychology, Opioid-Related Disorders epidemiology, Stress, Psychological epidemiology
- Abstract
Background and Aims: Stress can be validly assessed "live" or by a summary evaluation of the very recent past. Using smartphone-based ecological momentary assessment (EMA) combined with end-of-day (EOD) entries, we assessed the association between daily hassles, stressful events and use of opioids and cocaine, in opioid- and cocaine-using men and women., Methods: For up to 16 weeks, 161 outpatients in opioid-agonist treatment who reported cigarette smoking carried smartphones on which they reported stressful events (SEs) and drug use (DU) and completed an EOD questionnaire to report hassles encountered throughout the day, current perceived stress, cigarettes/day, and current mood. We compared EOD responses on days with and without SE and DU reports and on days when thrice-weekly urine drug screens indicated opioid or cocaine use or abstinence., Results: Participants (N = 161) made 11,544 EOD entries; EMA SEs were reported on 861 (7.5%) days, and DUs on 1685 (14.6%) days. The most frequently reported hassles in EOD entries were "not enough money" (31.4% of daily reports) and maintaining abstinence (18.7%). Total EOD hassles showed small but statistically significant associations [odds ratios (95% CIs)] with EMA SEs [1.09 (1.06-1.13)], DUs [1.08 (1.06-1.10)], and urine-positive opioid [1.06 (1.04-1.09)] and cocaine [1.03 (1.00-1.06)] results. Men and women had similar rates (mean/day (SD)) of hassles: men 2.25 (3.55); women 2.55 (3.76) (F
1,159 = 0.53, p = 0.47)., Conclusions: Daily hassles, reported at the end of the day, are associated with both same-day stressful events and drug use. Monitoring hassles and devising specific coping strategies might be useful therapeutic targets., (Published by Elsevier B.V.)- Published
- 2018
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28. Before and after: craving, mood, and background stress in the hours surrounding drug use and stressful events in patients with opioid-use disorder.
- Author
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Preston KL, Kowalczyk WJ, Phillips KA, Jobes ML, Vahabzadeh M, Lin JL, Mezghanni M, and Epstein DH
- Subjects
- Adult, Affect drug effects, Analgesics, Opioid administration & dosage, Analgesics, Opioid adverse effects, Cocaine administration & dosage, Craving drug effects, Female, Humans, Male, Methadone pharmacology, Methadone therapeutic use, Middle Aged, Opiate Substitution Treatment methods, Opiate Substitution Treatment psychology, Opioid-Related Disorders drug therapy, Random Allocation, Stress, Psychological drug therapy, Affect physiology, Cocaine adverse effects, Craving physiology, Opioid-Related Disorders psychology, Smartphone statistics & numerical data, Stress, Psychological psychology
- Abstract
Rationale: Ecological momentary assessment (EMA) of specific events usually focuses more on antecedents and concomitants than on aftermaths., Objectives: To examine mental state both before and after discrete episodes of stress and drug use., Methods: For up to 16 weeks, outpatients on opioid-agonist treatment carried smartphones on which they initiated entries for stressful events (SEs) or lapses to drug use (DUs), and thrice daily when randomly prompted (RPs). Participants rated their stress, opioid craving, cocaine craving, and moods. RP entries within 5 h of an event were analyzed and compared to other RPs., Results: Stress, negative mood, and craving were generally higher before and after DUs and SEs compared to background levels in participants with at least one DU (n = 149) or SE (n = 158). Before DUs, there were increases in negative mood, opioid craving, and cocaine craving, but not background stress. Before SEs, there were increases in background stress, opioid craving, and cocaine craving, but not negative mood. These changes were more variable after events than before. Neither DUs nor SEs were significantly related to positive mood., Conclusions: Stress increased before stressful-event entries, but was less evident before drug use. Craving increased in the hours before drug use and stressful events-and remained elevated in the hours after either event. These results suggest a stronger link between drug use and craving than between drug use and stress. Lapses to drug use did not improve mood or reduce stress, at least not at our 1-h-bin time resolution, suggesting that if such benefits exist, they are brief.
- Published
- 2018
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29. Exacerbated Craving in the Presence of Stress and Drug Cues in Drug-Dependent Patients.
- Author
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Preston KL, Kowalczyk WJ, Phillips KA, Jobes ML, Vahabzadeh M, Lin JL, Mezghanni M, and Epstein DH
- Subjects
- Adult, Female, Humans, Male, Middle Aged, Opioid-Related Disorders diagnosis, Opioid-Related Disorders epidemiology, Random Allocation, Self Report, Stress, Psychological diagnosis, Stress, Psychological epidemiology, Substance-Related Disorders diagnosis, Substance-Related Disorders epidemiology, Substance-Related Disorders psychology, Craving physiology, Cues, Opioid-Related Disorders psychology, Stress, Psychological psychology
- Abstract
In addiction, risk factors for craving and use include stress and drug-related cues. Stress and cues have additive or more-than-additive effects on drug seeking in laboratory animals, but, surprisingly, seem to compete with one another (ie, exert less-than-additive effects) in human laboratory studies of craving. We sought heretofore elusive evidence that human drug users could show additive (or more-than-additive) effects of stress and cues on craving, using ecological momentary assessment (EMA). Outpatients (N=182) maintained on daily buprenorphine or methadone provided self-reports of stress, craving, mood, and behavior on electronic diaries for up to 16 weeks. In three randomly prompted entries (RPs) per day, participants reported the severity of stress and craving and whether they had seen or been offered opioids, cocaine, cannabis, methamphetamine, alcohol, or tobacco. In random-effects models controlling for between-person differences, we tested effects of momentary drug-cue exposure and stress (and their interaction) on momentary ratings of cocaine and heroin craving. For cocaine craving, the Stress × Cue interaction term had a positive mean effect across participants (M=0.019; CL95 0.001-0.036), denoting a more-than-additive effect. For heroin, the mean was not significantly greater than 0, but the confidence interval was predominantly positive (M=0.019; CL95 -0.007-0.044), suggesting at least an additive effect. Heterogeneity was substantial; qualitatively, the Stress × Cue effect appeared additive for most participants, more than additive for a sizeable minority, and competitive in very few. In the field, unlike in human laboratory studies to date, craving for cocaine and heroin is greater with the combination of drug cues and stress than with either alone. For a substantial minority of users, the combined effect may be more than additive.
- Published
- 2018
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30. Sex differences in daily life stress and craving in opioid-dependent patients.
- Author
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Moran LM, Kowalczyk WJ, Phillips KA, Vahabzadeh M, Lin JL, Mezghanni M, Epstein DH, and Preston KL
- Subjects
- Adult, Affect, Analgesics, Opioid administration & dosage, Cocaine-Related Disorders psychology, Cues, Female, Humans, Male, Middle Aged, Opiate Substitution Treatment methods, Opioid-Related Disorders rehabilitation, Outpatients, Sex Factors, Smartphone, Craving, Ecological Momentary Assessment, Opioid-Related Disorders psychology, Stress, Psychological epidemiology
- Abstract
Background: Responses to stress and drug craving differ between men and women. Differences in the momentary experience of stress in relation to craving are less well-understood., Objectives: Using ecological momentary assessment (EMA), we examined sex differences in real-time in two areas: (1) causes and contexts associated with stress, and (2) the extent to which stress and drug cues are associated with craving., Methods: Outpatients on opioid-agonist treatment (135 males, 47 females) reported stress, craving, and behavior on smartphones for 16 weeks. They initiated an entry each time they felt more stressed than usual (stress event) and made randomly prompted entries 3 times/day. In stress-event entries, they identified the causes and context (location, activity, companions), and rated stress and craving severity., Results: The causes reported for stress events did not differ significantly by sex. Women reported arguing and being in a store more often during stress events, and men reported working more often during stress events, compared to base rates (assessed via random prompts). Women showed a greater increase in opioid craving as a function of stress (p < 0.0001) and had higher stress ratings in the presence of both stress and drug cues relative to men (p < 0.01). Similar effects were found for cocaine craving in men (p < 0.0001)., Conclusion: EMA methods provide evidence based on real-time activities and moods that opioid-dependent men and women experience similar contexts and causes for stress but differ in stress- and cue-induced craving. These findings support sex-based tailoring of treatment, but because not all participants conformed to the overall pattern of sex differences, any such tailoring should also consider person-level differences.
- Published
- 2018
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31. Context and craving during stressful events in the daily lives of drug-dependent patients.
- Author
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Preston KL, Kowalczyk WJ, Phillips KA, Jobes ML, Vahabzadeh M, Lin JL, Mezghanni M, and Epstein DH
- Subjects
- Adult, Affect, Buprenorphine therapeutic use, Female, Humans, Male, Methadone therapeutic use, Middle Aged, Narcotics therapeutic use, Opioid-Related Disorders drug therapy, Outpatients, Smartphone, Craving physiology, Opiate Substitution Treatment, Opioid-Related Disorders psychology, Stress, Psychological psychology
- Abstract
Rationale: Knowing how stress manifests in the lives of people with substance-use disorders could help inform mobile "just in time" treatment., Objectives: The purpose of this paper is to examine discrete episodes of stress, as distinct from the fluctuations in background stress assessed in most EMA studies., Methods: For up to 16 weeks, outpatients on opioid-agonist treatment carried smartphones on which they initiated an entry whenever they experienced a stressful event (SE) and when randomly prompted (RP) three times daily. Participants reported the severity of stress and craving and the context of the report (location, activities, companions). Decomposition of covariance was used to separate within-person from between-person effects; r
effect sizes below are within-person., Results: Participants (158 of 182; 87%) made 1787 stress-event entries. Craving for opioids increased with stress severity (reffect = 0.50). Stress events tended to occur in social company (with acquaintances, 0.63, friends, 0.17, or on the phone, 0.41) rather than with family (spouse, -0.14; child, -0.18), and in places with more overall activity (bars, 0.32; outside, 0.28; walking, 0.28) and more likelihood of unexpected experiences (with strangers, 0.17). Being on the internet was slightly protective (-0.22). Our prior finding that being at the workplace protects against background stress in our participants was partly supported in these stressful-event data., Conclusions: The contexts of specific stressful events differ from those we have seen in prior studies of ongoing background stress. However, both are associated with drug craving.- Published
- 2017
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32. Substance use and hepatitis C: an ecological momentary assessment study.
- Author
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Phillips KA, Epstein DH, Vahabzadeh M, Mezghanni M, Lin JL, and Preston KL
- Subjects
- Adult, Antiviral Agents therapeutic use, Cocaine-Related Disorders drug therapy, Female, Hepatitis C drug therapy, Heroin Dependence drug therapy, Humans, Male, Methadone therapeutic use, Middle Aged, Prospective Studies, Risk-Taking, Affect, Cocaine-Related Disorders psychology, Craving, Hepatitis C psychology, Heroin Dependence psychology
- Abstract
Objective: The objective of this study was to assess craving and mood related to opioid and cocaine use among asymptomatic hepatitis C virus (HCV)+ and HCV- methadone patients who have not started antiviral treatment., Methods: In this 28-week prospective ecological momentary assessment (EMA) study, 114 methadone-maintained, heroin- and cocaine-abusing individuals reported from the field in real time on their mood, craving, exposure to drug-use triggers, and drug use via handheld computers., Results: Sixty-one percent were HCV+; none were overtly symptomatic or receiving HCV treatment. HCV status was not associated with age, sex, race, or past-30-day or lifetime heroin or cocaine use. In event-contingent EMA entries, HCV+ individuals more often attributed use to having been bored, worried, or sad; feeling uncomfortable; or others being critical of them compared with HCV- participants. In randomly prompted EMA entries, HCV+ participants reported significantly more exposure to drug-use triggers, including handling ≥$10, seeing cocaine or heroin, seeing someone being offered/use cocaine or heroin, being tempted to use cocaine, and wanting to see what would happen if they used just a little cocaine or heroin., Conclusions: HCV+ individuals experienced more negative moods and more often cited these negative moods as causes for drug use. HCV+ individuals reported greater exposure to environmental drug-use triggers, but they did not more frequently cite these as causes for drug use. The EMA data reported here suggest that HCV+ intravenous drug users may experience more labile mood and more reactivity to mood than HCV- intravenous drug users. The reason for the difference is not clear, but HCV status may be relevant to tailoring of treatment.
- Published
- 2014
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33. Real-time tracking of neighborhood surroundings and mood in urban drug misusers: application of a new method to study behavior in its geographical context.
- Author
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Epstein DH, Tyburski M, Craig IM, Phillips KA, Jobes ML, Vahabzadeh M, Mezghanni M, Lin JL, Furr-Holden CDM, and Preston KL
- Subjects
- Adult, Behavior, Addictive diagnosis, Behavior, Addictive psychology, Cohort Studies, Computer Systems trends, Drug Users psychology, Female, Humans, Longitudinal Studies, Male, Middle Aged, Stress, Psychological diagnosis, Stress, Psychological epidemiology, Stress, Psychological psychology, Substance-Related Disorders diagnosis, Substance-Related Disorders psychology, Young Adult, Affect, Behavior, Addictive epidemiology, Geographic Information Systems trends, Residence Characteristics, Substance-Related Disorders epidemiology, Urban Population trends
- Abstract
Background: Maladaptive behaviors may be more fully understood and efficiently prevented by ambulatory tools that assess people's ongoing experience in the context of their environment., Methods: To demonstrate new field-deployable methods for assessing mood and behavior as a function of neighborhood surroundings (geographical momentary assessment; GMA), we collected time-stamped GPS data and ecological momentary assessment (EMA) ratings of mood, stress, and drug craving over 16 weeks at randomly prompted times during the waking hours of opioid-dependent polydrug users receiving methadone maintenance. Locations of EMA entries and participants' travel tracks calculated for the 12 before each EMA entry were mapped. Associations between subjective ratings and objective environmental ratings were evaluated at the whole neighborhood and 12-h track levels., Results: Participants (N=27) were compliant with GMA data collection; 3711 randomly prompted EMA entries were matched to specific locations. At the neighborhood level, physical disorder was negatively correlated with negative mood, stress, and heroin and cocaine craving (ps<.0001-.0335); drug activity was negatively correlated with stress, heroin and cocaine craving (ps .0009-.0134). Similar relationships were found for the environments around respondents' tracks in the 12h preceding EMA entries., Conclusions: The results support the feasibility of GMA. The relationships between neighborhood characteristics and participants' reports were counterintuitive and counter-hypothesized, and challenge some assumptions about how ostensibly stressful environments are associated with lived experience and how such environments ultimately impair health. GMA methodology may have applications for development of individual- or neighborhood-level interventions., (Published by Elsevier Ireland Ltd.)
- Published
- 2014
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34. Smartphone Delivery of Mobile HIV Risk Reduction Education.
- Author
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Phillips KA, Epstein DH, Mezghanni M, Vahabzadeh M, Reamer D, Agage D, and Preston KL
- Abstract
We sought to develop and deploy a video-based smartphone-delivered mobile HIV Risk Reduction (mHIVRR) intervention to individuals in an addiction treatment clinic. We developed 3 video modules that consisted of a 10-minute HIVRR video, 11 acceptability questions, and 3 knowledge questions and deployed them as a secondary study within a larger study of ecological momentary and geographical momentary assessments. All 24 individuals who remained in the main study long enough completed the mHIVRR secondary study. All 3 videos met our a priori criteria for acceptability "as is" in the population: they achieved median scores of ≤2.5 on a 5-point Likert scale; ≤20% of the individuals gave them the most negative rating on the scale; a majority of the individuals stated that they would not prefer other formats over video-based smartphone-delivered one (all P < 0.05). Additionally, all of our video modules met our a priori criteria for feasibility: ≤20% of data were missing due to participant noncompliance and ≤20% were missing due to technical failure. We concluded that video-based mHIVRR education delivered via smartphone is acceptable, feasible and may increase HIV/STD risk reduction knowledge. Future studies, with pre-intervention assessments of knowledge and random assignment, are needed to confirm these findings.
- Published
- 2013
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35. Real-time electronic diary reports of cue exposure and mood in the hours before cocaine and heroin craving and use.
- Author
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Epstein DH, Willner-Reid J, Vahabzadeh M, Mezghanni M, Lin JL, and Preston KL
- Subjects
- Adult, Ambulatory Care, Cocaine-Related Disorders rehabilitation, Combined Modality Therapy, Counseling, Female, Heroin Dependence rehabilitation, Humans, Male, Methadone therapeutic use, Middle Aged, Narcotics therapeutic use, Prospective Studies, Recurrence, Social Environment, Substance Withdrawal Syndrome rehabilitation, Token Economy, Young Adult, Affect, Cocaine-Related Disorders psychology, Computers, Handheld, Cues, Heroin Dependence psychology, Motivation, Substance Withdrawal Syndrome psychology
- Abstract
Context: In ecological momentary assessment (EMA), participants electronically report their activities and moods in their daily environments in real time, enabling a truly prospective approach to the study of acute precipitants of behavioral events. Ecological momentary assessment has greatly enhanced the study of tobacco addiction, but its use has rarely been attempted in individuals with cocaine or heroin addiction., Objective: To prospectively monitor the acute daily life precipitants of craving for and use of cocaine and heroin., Design: Cohort study., Participants: A volunteer sample of 114 cocaine- and heroin-abusing outpatients who were being treated with methadone provided EMA data on handheld electronic devices for 14 918 person-days (mean, 130.9; range, 6-189 days per participant). Of these outpatients, a total of 102 (63 men, 39 women) provided acute precraving and/or preuse data and were thus included in the present analyses., Main Outcome Measures: Changes in reports of mood and exposure to 12 putative drug-use triggers at random intervals during the 5 hours preceding each self-reported episode of drug craving or use, analyzed via repeated-measures logistic regression (generalized linear mixed models)., Results: During the 5 hours preceding cocaine use or heroin craving, most of the 12 putative triggers showed linear increases. Cocaine use was most robustly associated with increases in participants reporting that they "saw [the] drug" (P < .001), were "tempted to use out of the blue" (P < .001), "wanted to see what would happen if I used" (P < .001), and were in a good mood (P < .001). Heroin craving was most robustly associated with increases in reports of feeling sad (P < .001) or angry (P = .01). Cocaine craving and heroin use showed few reliable associations with any of the putative triggers assessed., Conclusions: These findings confirm that polydrug-abusing individuals can provide behavioral data in their daily environments using handheld electronic devices and that those data can reveal orderly patterns, including prospectively detectable harbingers of craving and use, which may differ across drugs.
- Published
- 2009
- Full Text
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36. Automation in an addiction treatment research clinic: computerised contingency management, ecological momentary assessment and a protocol workflow system.
- Author
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Vahabzadeh M, Lin JL, Mezghanni M, Epstein DH, and Preston KL
- Subjects
- Ambulatory Care organization & administration, Automation methods, Behavior Therapy methods, Communication, Decision Support Systems, Clinical, Efficiency, Organizational, Humans, Research Design legislation & jurisprudence, Substance Abuse Detection methods, Time Factors, Information Systems, Substance Abuse Treatment Centers organization & administration, Substance-Related Disorders rehabilitation
- Abstract
Introduction and Aims: A challenge in treatment research is the necessity of adhering to protocol and regulatory strictures while maintaining flexibility to meet patients' treatment needs and to accommodate variations among protocols. Another challenge is the acquisition of large amounts of data in an occasionally hectic environment, along with the provision of seamless methods for exporting, mining and querying the data., Design and Methods: We have automated several major functions of our outpatient treatment research clinic for studies in drug abuse and dependence. Here we describe three such specialised applications: the Automated Contingency Management (ACM) system for the delivery of behavioural interventions, the transactional electronic diary (TED) system for the management of behavioural assessments and the Protocol Workflow System (PWS) for computerised workflow automation and guidance of each participant's daily clinic activities. These modules are integrated into our larger information system to enable data sharing in real time among authorised staff., Results: ACM and the TED have each permitted us to conduct research that was not previously possible. In addition, the time to data analysis at the end of each study is substantially shorter. With the implementation of the PWS, we have been able to manage a research clinic with an 80 patient capacity, having an annual average of 18,000 patient visits and 7300 urine collections with a research staff of five. Finally, automated data management has considerably enhanced our ability to monitor and summarise participant safety data for research oversight., Discussion and Conclusions: When developed in consultation with end users, automation in treatment research clinics can enable more efficient operations, better communication among staff and expansions in research methods.
- Published
- 2009
- Full Text
- View/download PDF
37. [The contribution of capsular distension to the treatment of primary adhesive capsulitis of the shoulder: a comparative study versus rehabilitation].
- Author
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Elleuch MH, Yahia A, Ghroubi S, Kharrat O, Mezghanni M, and Ayedi K
- Subjects
- Anesthetics, Local administration & dosage, Anesthetics, Local therapeutic use, Bursitis rehabilitation, Female, Humans, Injections, Intra-Articular, Male, Middle Aged, Pain Measurement, Physical Therapy Modalities, Pregnatrienes administration & dosage, Pregnatrienes therapeutic use, Prospective Studies, Quality of Life, Severity of Illness Index, Shoulder Pain drug therapy, Shoulder Pain etiology, Sodium Chloride administration & dosage, Sodium Chloride therapeutic use, Treatment Outcome, Bursitis therapy, Dilatation methods, Joint Capsule surgery, Shoulder Joint
- Abstract
Objectives: To describe the epidemiological and clinical features of patients with primitive adhesive capsulitis of the shoulder treated by capsular distension and then rehabilitation; to evaluate the short-, mid- and long-term efficiency of this therapeutic protocol and compare it with rehabilitation alone., Materials and Methods: This was a two-year prospective study. Sixty patients were included and divided into populations P1 (capsular distension and rehabilitation) and P2 (rehabilitation only). Assessment of the treatments' efficacy was based on the following parameters: pain on a visual analogue scale (VAS), joint motion in several axes, a simplified Constant score (functional ability) and the SF-36 quality of life score., Results: Thirty patients (mean age: 56) underwent capsular distension. The Constant score was judged to be poor in over half of the patients. All the quality of life parameters were modified. When compared with P2, the P1 group showed a statistically significant improvement in terms of the pain score (p=0.005), anterior elevation (p=0.001), lateral elevation (p=0.005), external rotation (p=0.006) and the Constant score (p<0.001) one week after capsular distension. One year after capsular distension, this gain persisted in a statistically significant manner for all functional parameters and all SF-36 dimensions (p<0.001 for PF, RP, BP, SF and RE; p=0.01 for GH and VT and p=0.002 for MH)., Conclusion: Our results show that capsular distension and subsequent intensive rehabilitation have a beneficial effect. This combination enables rapid, significant improvement from the first week onwards. The improvement phase lasts for one month and may hold steady for up to 12 months.
- Published
- 2008
- Full Text
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38. Pharmacy informatics in controlled substances research.
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Lin JL, Vahabzadeh M, Mezghanni M, Na PJ, Leff M, and Contoreggi C
- Subjects
- United States, Biomedical Research methods, Clinical Pharmacy Information Systems, Decision Support Systems, Clinical organization & administration, Drug Information Services organization & administration, Medical Record Linkage methods
- Abstract
Pharmacies have become essential components in support of clinical research. Their operations become highly complex when preponderance of prescriptions is composed of controlled substances. Application of informatics will result in more efficient operations. We present the Pharmacy Information Management System (PIMS) that includes a set of decision support systems to address the pharmacy challenges and is integrated into our electronic health record system.
- Published
- 2008
39. Knee osteoarthritis in 50 former top-level soccer players: a comparative study.
- Author
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Elleuch MH, Guermazi M, Mezghanni M, Ghroubi S, Fki H, Mefteh S, Baklouti S, and Sellami S
- Subjects
- Case-Control Studies, Cross-Sectional Studies, Disability Evaluation, Humans, Male, Middle Aged, Pain Measurement, Tunisia, Osteoarthritis, Knee physiopathology, Soccer physiology
- Abstract
Objectives: To study the prevalence of knee osteoarthritis in a group of former top-level football players and to assess the condition's impact on joint function and structure, compared with a control group., Materials and Methods: A cross-sectional, descriptive study was performed on a group of male former top-level football players (group G1), aged over 45 and with no history of knee trauma, arthritis, arthropathy or surgery. A second group of otherwise matched nonsporting subjects (group G2) was compared with the first group. For each subject, we specified age, weight, height, body mass index (BMI), dominant foot, the presence of knee axis deviation, the presence of pain and functional impairment. The pain level was assessed using a visual analogue scale (VAS). The functional assessment was performed using the Arabic version of the Lequesne index. Moreover, for each former player, we specified a number of sporting parameters, including those related to their playing career. The diagnosis of knee osteoarthritis was made using standard radiological and clinical criteria. The radiological severity of knee osteoarthritis was assessed using the Kellgren and Lawrence classification. We compared the two groups in terms of the frequency of knee osteoarthritis, the severity of pain and disability and the severity of structural impairment., Results: Our study included two groups of patients: a group of 50 former football players (G1) with a mean age of 49.2. Overweight was noted in 40 subjects. The mean number of training hours a week was 14+/-3.5 during their professional career and 2.5 during their retirement. Half of the sportsmen had taken part in more than 200 matches. Knee axis deviation was observed in 29 former players (i.e. 58% of the cases) and 27 displayed genuvarum. A group of 50 nonsporting volunteers (G2) was matched to the G1 group in terms of age, BMI and frequency of axis deviation. Knee osteoarthritis was more common in the football players than in the nonsporting subjects (80% versus 68%), although the difference was not statistically significant. Whereas pain was noted in only six footballers (with an average VAS score of 25.4+/-6.3mm) and was observed in 50% of controls (with a mean VAS score of 39.2mm+/-7.3) (P=0.001). Disability was recorded in six sportsmen, with a mean Lequesne score of 0.38+/-1.27. Disability was more frequent (23 subjects) and more intense (with a mean Lequesne score of 1.71+/-3.2) in the nonsportsmen (P=0.001). The Kellgreen and Lawrence radiological classification revealed that 57.5% of the sportsmen had scores of III or IV, compared with just 29.4% in the control group., Conclusion: Knee osteoarthritis is common in male football players. However, our study shows that the condition is less painful and less likely to cause functional disability (but paradoxically more destructive) than in nonsportsmen.
- Published
- 2008
- Full Text
- View/download PDF
40. A clinical recruiting management system for complex multi-site clinical trials using qualification decision support systems.
- Author
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Vahabzadeh M, Lin JL, Mezghanni M, Contoreggi C, and Leff M
- Subjects
- Humans, Substance-Related Disorders, Clinical Trials as Topic, Decision Support Systems, Clinical, Management Information Systems, Patient Selection
- Abstract
A clinical recruiting management system with qualification decision support systems was developed to increase the efficiency of screening and evaluation of participants during a recruiting process whereby recruiting for various protocols are conducted at multiple sites by different groups with process interdependencies. This system is seamlessly integrated into our enterprise-scale Human Research Information System (HuRIS), encompassing research participants' electronic health records (EHR), with real-time access to the clinical trial data.
- Published
- 2007
41. A high-level specification for adaptive ecological momentary assessment: real-time assessment of drug craving, use and abstinence.
- Author
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Lin JL, Vahabzadeh M, Mezghanni M, Epstein DH, and Preston KL
- Subjects
- Behavioral Research methods, Computer Systems, Humans, Medical Records, Software, Computers, Handheld, Medical Records Systems, Computerized, Software Design, Substance-Related Disorders psychology, Surveys and Questionnaires
- Abstract
In psychological research, efforts to capture day-to-day human experience traditionally relied on pen-and-paper diaries and questionnaires. Some current studies, however, incorporate handheld computers, which provide researchers with many options and advantages in addition to providing more reliable data. One advantage of using handheld computers is the programmability of the electronic diary, which, compared to old-fashioned paper diaries, affords the researchers with a wealth of possibilities. An important possibility is to construct a built-in mechanism in the computer-administered questionnaires that would allow transparent branching, in which question presentation is contingent on participants' answers to previous questions. The major hurdle in implementing such an approach is the limitations of the platform used for such assessments: inexpensive "low-end" handheld devices. We propose a high-level specification which enables non-programming researchers to "branch" their questionnaires without modifications to the source code in a highly user-friendly fashion, with backtracking capability and very modest hardware requirements. A finite state automaton approach was implemented, we believe for the first time, to create an auto-trigger mechanism for the real-time evaluation of the conditions. This solution provides our investigators with the capacity to administer efficient assessments that are dynamically customized to reflect participants' behaviors without the need for any post-production programming.
- Published
- 2005
42. [A long-term follow up of the shoulder in obstetrical brachial palsy].
- Author
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Guermazi M, Ghroubi S, Mezghanni M, Triki FE, and Elleuch MH
- Subjects
- Brachial Plexus Neuropathies surgery, Child, Preschool, Female, Follow-Up Studies, Humans, Infant, Infant, Newborn, Joint Dislocations pathology, Joint Dislocations surgery, Male, Physical Therapy Modalities, Range of Motion, Articular, Remission, Spontaneous, Shoulder Joint pathology, Shoulder Joint surgery, Birth Injuries pathology, Birth Injuries therapy, Brachial Plexus Neuropathies pathology, Brachial Plexus Neuropathies therapy, Joint Dislocations etiology, Shoulder Injuries
- Abstract
Objectives: To study shoulder impairment and disability caused by obstetrical brachial plexus palsy, their evolution under physical and surgical treatments, and the place of complementary explorations in persistent sequels., Methods: From 1991 to 2000, 129 patients (66 M, 63 F) were included in a retrospective study. Impairment was assessed by muscle recovery (deltoid, biceps, external rotators) and shoulder passive motion. Disability was assessed by Mallet functional test., Results: Full spontaneous recovery was noted in 20% of patients before the age of 3 months. Repair of the nerve lesion was undertaken in four children between the 18th and 24th months. Full recovery of deltoid and biceps was noted in three-fourth of whole cases before the 12th month, and of the external rotation in only 45% at this same age. Seventy-seven percent of patients showed stage >or= III of Mallet test (VI: 20%, IV: 32%; III: 25%) at a middle age of 3.5 years. A long-term follow-up showed an external rotation limited less than 20 degrees in 15 children. Investigation by RMN or Arthroscanner was realized for five patients, this reveals a deformation with subluxation of the humeral head in two cases. Ten children were operated (liberation of sub-scapula in nine cases associated to a tendinous transfer six times; humeral osteotomie in one case). This surgery has allowed the improvement of the functional state in all cases., Conclusion: After-effects in shoulder are frequent especially the limitation of external rotation, which can lead to a deformation, and subluxation of the humeral head. The authors insist on the importance to push investigations in case of limitation of the passive external rotation to improve the therapeutic choice.
- Published
- 2004
- Full Text
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43. [Epicondylitis in 35 amateur athletes].
- Author
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Ghattassi I, Mezghanni M, Baklouti S, and Elleuch MH
- Subjects
- Adolescent, Adult, Anti-Inflammatory Agents therapeutic use, Athletic Injuries diagnosis, Biomechanical Phenomena, Child, Female, Humans, Male, Middle Aged, Physical Therapy Modalities, Risk Factors, Steroids, Tennis Elbow diagnosis, Treatment Outcome, Athletic Injuries etiology, Athletic Injuries therapy, Tennis Elbow etiology, Tennis Elbow therapy
- Published
- 2000
44. [Achilles tendon rupture in athletes. Ten cases].
- Author
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Ghattassi I, Kammoun MH, Bellaaj L, Mezghanni M, and Elleuch MH
- Subjects
- Activities of Daily Living, Adult, Athletic Injuries diagnosis, Athletic Injuries etiology, Athletic Injuries physiopathology, Causality, Follow-Up Studies, Humans, Male, Middle Aged, Patient Selection, Physical Therapy Modalities, Range of Motion, Articular, Rupture, Treatment Outcome, Achilles Tendon injuries, Athletic Injuries therapy
- Published
- 2000
45. [Strangulation of glans penis by hair or "penis tourniquet syndrome"].
- Author
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Mhiri MN, Midassi H, Mezghanni M, and Smida ML
- Subjects
- Child, Child, Preschool, Circumcision, Male, Humans, Male, Penis surgery, Prognosis, Syndrome, Tourniquets, Tunisia, Child Abuse, Penis injuries
- Abstract
The authors report 5 cases of strangulation of the penis with hair in children. This affection, more seen frequently within socially disadvantaged children, needs early diagnosis and treatment because it may be responsible for glans amputation. A better knowledge of this accident by parents and physicians might prevent this barbaric aggression.
- Published
- 1987
46. Vesico-vaginal fistula induced by an intravesical foreign body.
- Author
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Mhiri MN, Amous A, Mezghanni M, Rekik S, and Smida ML
- Subjects
- Adult, Female, Foreign Bodies surgery, Humans, Urinary Bladder Calculi etiology, Vagina pathology, Vesicovaginal Fistula pathology, Foreign Bodies complications, Vesicovaginal Fistula etiology
- Published
- 1988
- Full Text
- View/download PDF
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