27 results on '"Xuereb M"'
Search Results
2. Mental health front-liners: Police officers' knowledge and attitudes towards suicide in Malta.
- Author
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Zammit, D. and Bezzina Xuereb, M.
- Subjects
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SUICIDE prevention , *SUICIDAL ideation , *LIKERT scale , *SUICIDE , *EDUCATIONAL attainment - Abstract
Introduction: Police-officers are in a strategic position of providing the first immediate response to a crisis as mental health frontliners. Objectives: In this nation-wide cross-sectional study, we explored knowledge and attitudes towards suicide in the local police force, a crucial first step in the design and implementation of effective suicide prevention programmes. Methods: An online, anonymous questionnaire was distributed to all local police-officers (n=2600). It contained questions about their demographics and their experience with suicide while on duty, along with 34 statements from the validated tool Attitudes Towards Suicide (ATTS) (Renberg & Jacobsson. Suicide Life Threat Behav. 2003; 33 52-64), scored on a 5-point Likert Scale (1 = Strongly Disagree, 5 = Strongly Agree). Results: The sub-scale " Suicide as a right " was positively correlated with " Tabooing " (r (201) =.25, p=<.001), " Normal-common " (r (201) =.29, p=<.001), and " Resignation " (r (201) =.47, p=<.001), but negatively correlated with " Incomprehensibility " (r (201) = -.26, p=<.001), and " Preparedness to Prevent " (r (201) = -.19, p=<.001), meaning such individuals had a more permissive attitude towards suicide. On the other hand, the subscale Preventability was found to be positively correlated with Incomprehensibility (r (201) =.21, p=<.001) and Preparedness to Prevent (r (201) =.30, p=<.001). Females scored higher in the sub-scale Non-communication (M=3.40, 95% CI [3.29, 3.51]) while males scored higher in Preventability (M=3.35, 95% CI [3.27, 3.44]). The higher the educational status of police-officers, the more they adopt a pro-prevention attitude to suicide (M=3.67, 95% CI [3.44, 3.89]) and the more likely they are to appreciate that suicidal thoughts and behaviour can be common (M=3.40, 95% CI [3.20, 3.60]). Participants with a mixed/different composition at home (M=4.05, 95% CI [3.86, 4.24]) and/or have experienced only between 0 to 2 situations related to suicide in the past one year alone (M=4.05, 95% CI [3.94, 4.16]), were the most likely to feel prepared to prevent suicide. Conclusions: This study brings out different attitudes police-officers hold towards different aspects of suicide, influenced by their gender, educational background, personal life at home and total exposure to suicide during their career. Training programmes can help improve their knowledge and attitudes towards suicide, leading to a more positive behavioural response to individuals in crisis and create a safer environment. Malta, through an EU-funded programme, is currently investing its resources on drafting a national suicide prevention strategy, and such educational opportunities for our frontliners will ensure we have the right tools in screening, identifying, treating, and saving more lives. Abbreviations: M: Mean score; CI: Confidence Interval Disclosure of Interest: None Declared [ABSTRACT FROM AUTHOR]
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- 2024
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3. Nanoscale Quantum Optics
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I. D'Amico, D. G. Angelakis, F. Bussières, H. Caglayan, C. Couteau, T. Durt, B. Kolaric, P. Maletinsky, W. Pfeiffer, P. Rabl, A. Xuereb, M. Agio
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- 2019
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4. Principal Component Analysis for High Dimension Stochastic Gaussian Process Model Fitting
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Xuereb, M., primary, Huo, T. M., additional, and Ng, S. H., additional
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- 2019
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5. A Quasi-Real-Time Ground-Based Trajectory Optimization Tool for Greener Operations
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Micallef, M., Chircop, K., David Zammit Mangion, Sammut, A., Xuereb, M., and Muscat, A.
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- 2014
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6. Long-term preservation of left ventricular function in medically treated patients with coronary artery disease and persistent exercise-induced ischemia
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Fragasso G, Xuereb RG, Xuereb M, Rossetti E, Chierchia SL, MARGONATO , ALBERTO, Fragasso, G, Xuereb, Rg, Xuereb, M, Rossetti, E, Margonato, Alberto, and Chierchia, Sl
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Nitrates ,Time Factors ,Nifedipine ,Systole ,Vasodilator Agents ,Cardiovascular Agents ,Coronary Disease ,Stroke Volume ,Middle Aged ,Ventricular Function, Left ,Diltiazem ,Atenolol ,Diastole ,Echocardiography ,Data Interpretation, Statistical ,Electrocardiography, Ambulatory ,Exercise Test ,Humans ,Drug Therapy, Combination ,Amlodipine ,Anti-Arrhythmia Agents ,Aged ,Follow-Up Studies - Abstract
Little information is available on the long-term evolution of left ventricular function of medically treated patients with coronary artery disease and gross limitation of coronary flow reserve. The aim of this study was to assess the long-term evolution of effort tolerance and left ventricular function and their relation to the control of ischemic events in patients with coronary artery disease and prolonged inducible exercise-induced myocardial dysfunction who either declined or were ineligible for cardiac revascularization.
- Published
- 1999
7. Development of novel tricalcium silicate-based endodontic cements with sintered radiopacifier phase
- Author
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Xuereb, M., primary, Sorrentino, F., additional, Damidot, D., additional, and Camilleri, Josette, additional
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- 2015
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8. Late presentation and successful treatment of classical scimitar syndrome
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Grech, Victor E., Xuereb, R., Xuereb, M., Manche, Alexander, Schembri, K., and DeGiovanni, Joseph V.
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Heart defects, Congenital ,cardiovascular system ,cardiovascular diseases ,respiratory system - Abstract
Scimitar syndrome is a form of partial anomalous pulmonary venous drainage that is dramatically visible on plain chest radiography (CXR). In these individuals the entire venous drainage from the right lung enters a single anomalous large vein that descends to the inferior vena cava. This descending vein is visible on CXR as a curvilinear density along the right heart border and resembles the curved Turkish sword that gives the condition its name. Scimitar syndrome forms part of the large spectrum of associated conditions known as venolobar syndrome. These include right lung hypoplasia or sequestered segments of right lung, congenital heart disease and various others. We report the case of a young woman who presented incidentally, with a murmur, at 16 years of age. Full investigation including angiography showed a large atrial septal defect with right heart dilation and scimitar syndrome. She underwent surgical correction with uneventful and complete correction by baffling of the scimitar vein from its entry into the inferior vena to the left atrium through the enlarged atrial septal defect., peer-reviewed
- Published
- 2003
9. PREVALENCE OF SILENT-MYOCARDIAL-ISCHEMIA DURING EXERCISE STRESS-TESTING - ITS RELATION TO EFFORT TOLERANCE AND MYOCARDIAL PERFUSION ABNORMALITIES
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FRAGASSO G, SCIAMMARELLA MG, ROSSETTI EE, XUEREB RG, XUEREB M, BONETTI F, CARANDENTE OM, CHIERCHIA SL, MARGONATO , ALBERTO, Fragasso, G, Sciammarella, Mg, Rossetti, Ee, Xuereb, Rg, Xuereb, M, Bonetti, F, Carandente, Om, Margonato, Alberto, and Chierchia, Sl
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- 1992
10. Securitisation in China
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Xuereb, M., primary
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- 2005
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11. Specificity and sensitivity of exercise-induced ST segment elevation for detection of residual viability: comparison with fluorodeoxyglucose and positron emission tomography
- Author
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Margonato, A, Chierchia, S, Xuereb, R, Xuereb, M, Fragasso, G, Cappelletti, A, Landoni, C, Lucignani, G, Fazio, F, Chierchia, SL, Xuereb, RG, LANDONI, CLAUDIO, FAZIO, FERRUCCIO, Margonato, A, Chierchia, S, Xuereb, R, Xuereb, M, Fragasso, G, Cappelletti, A, Landoni, C, Lucignani, G, Fazio, F, Chierchia, SL, Xuereb, RG, LANDONI, CLAUDIO, and FAZIO, FERRUCCIO
- Abstract
OBJECTIVES: We evaluated the sensitivity and specificity of exercise-induced ST segment elevation for the detection of residual myocardial viability. BACKGROUND: Assessment of residual viability after myocardial infarction is relevant for establishing indication for revascularization. We have previously shown that exercise-induced ST segment elevation is a marker of residual viability. METHODS: We studied 34 patients with a previous Q wave myocardial infarction (anterior in 21, inferior in 13) of whom 18 (group A) had exercise-induced ST segment elevation in more than one lead (mean [+/- SD] 1.8 +/- 0.9 mm, range 1 to 4) and 16 (group B) did not. All patients underwent rest technetium-99m methoxyisobutyl isonitrile single-photon emission computed tomography (SPECT), fluorine-18 (F-18) fluorodeoxyglucose positron emission tomography and coronary angiography. The time elapsed between the infarction and the viability study was 72 +/- 108 days (range 15 to 400) in group A and 516 +/- 545 days (range 14 to 1,800) in group B. RESULTS: The presence and site of previous infarction were confirmed by SPECT studies in all 34 patients. Uptake of F-18 fluorodeoxyglucose within the infarcted area was present in 18 of 18 patients in group A but in only 9 (56%) of 16 in group B (p < 0.01). In patients with an anterior infarction, the sensitivity, specificity and predictive accuracy of exercise-induced ST segment elevation for detection of residual viability were 82%, 100% and 86%, respectively (95% confidence intervals 46% to 83.5%, 59% to 100% and 55.6% to 87.1%, respectively). CONCLUSIONS: Exercise-induced ST segment elevation in infarct-related leads has a high specificity and acceptable sensitivity for detection of residual viability within the infarcted area.
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- 1995
12. Prevalence of silent myocardial ischaemia during exercise stress testing. Its relation to effort tolerance and myocardial perfusion abnormalities
- Author
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FRAGASSO, G., primary, SCIAMMARELLA, M. G., additional, ROSSETTI, E. E., additional, XUEREB, R. G., additional, XUEREB, M., additional, BONETTI, F., additional, CARANDENTE, O. M., additional, MARGONATO, A., additional, and CHIERCHIA, S. L., additional
- Published
- 1992
- Full Text
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13. Stroke following acute myocardial infarction in diabetics
- Author
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PULLICINO, P. M., primary, XUEREB, M., additional, AQUILINA, J., additional, and PIEDMONTE, M. R., additional
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- 1992
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14. Oral contraceptive use and risk of stroke.
- Author
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Xuereb, M, primary and Pullicino, P, additional
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- 1988
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15. The use of repetitive transcranial magnetic stimulation in Malta – A clinical perspective.
- Author
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Xuereb, M.
- Subjects
- *
TRANSCRANIAL magnetic stimulation , *CLINICAL trials , *TREATMENT effectiveness , *MENTAL depression , *FOLLOW-up studies (Medicine) , *PATIENT monitoring - Abstract
Repetitive Transcranial Magnetic Stimulation (rTMS) has been approved by the FDA for treatment resistant, severe, non-psychotic unipolar affective disorder. The aim of this presentation is to share our experience setting up the rTMS clinic – a first on our small island. We will also be showing data of patients over the treatment period through individual comments made by patients as well as through established depression scales. Finally, a modus operandi of managing side effects, community monitoring and follow-up will be suggested. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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16. Antiischemic Effects of Intravenous Diazepam in Patients with Coronary Artery Disease
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Robert G. Xuereb, Mariosa Xuereb, E. Rossetti, Gabriele Fragasso, Alberto Margonato, Sergio Chierchia, Rossetti, E, Fragasso, G, Xuereb, Rg, Xuereb, M, Margonato, Alberto, and Chierchia, Sl
- Subjects
Adult ,Male ,Randomization ,Myocardial Ischemia ,Ischemia ,Hemodynamics ,Coronary Disease ,Placebo ,law.invention ,Coronary artery disease ,Contractility ,Randomized controlled trial ,Heart Rate ,law ,medicine ,Humans ,Aged ,Pharmacology ,Diazepam ,business.industry ,Middle Aged ,medicine.disease ,Anesthesia ,Injections, Intravenous ,Exercise Test ,Female ,Cardiology and Cardiovascular Medicine ,business ,medicine.drug - Abstract
Diazepam (DZP) is commonly used in treatment of patients with acute ischemic syndromes to allay anxiety, but benzodiazepines reduce myocardial contractility and increase myocardial blood flow. To investigate the antiischemic effect of DZP, we studied 13 patients with a positive exercise test and angiographically documented coronary artery disease. All patients were submitted to a randomized, placebo-controlled trial using 0.9% NaCl infusion as placebo and intravenous (i.v.) diazepam (0.1 mg/kg in 20 min). Exercise tests performed immediately after the infusions showed that as compared with placebo, DZP significantly prolonged time to 1-mm ST-segment depression (557 +/- 198 vs. 428 +/- 226 s, p < 0.0001) and total exercise duration (624 +/- 177 vs. 561 +/- 188 s, p < 0.007). Rate-pressure product (RPP) at 1-mm ST-segment depression was not significantly different with the two treatments. DZP significantly delays onset of exercise-induced myocardial ischemia in patients with coronary artery disease. Because RPP at onset of ischemia was similar to that recorded with placebo despite greater levels of external workload, the antiischemic action of DZP appears to be mediated, at least partially, by a reduction in myocardial oxygen consumption.
- Published
- 1994
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17. SPECIFICITY AND SENSITIVITY OF EXERCISE-INDUCED ST SEGMENT ELEVATION FOR DETECTION OF RESIDUAL VIABILITY - COMPARISON WITH FLUORODEOXYGLUCOSE AND POSITRON EMISSION TOMOGRAPHY
- Author
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Mariosa Xuereb, Sergio Chierchia, Gabriele Fragasso, Alberto Cappelletti, Claudio Landoni, Alberto Margonato, Robert G. Xuereb, Ferruccio Fazio, Giovanni Lucignani, Margonato, Alberto, Chierchia, Sl, Xuereb, Rg, Xuereb, M, Fragasso, G, Cappelletti, A, Landoni, C, Lucignani, G, Fazio, F., Margonato, A, Chierchia, S, Xuereb, R, and Fazio, F
- Subjects
Male ,Technetium Tc 99m Sestamibi ,Fluorine Radioisotopes ,medicine.medical_treatment ,Myocardial Infarction ,Infarction ,Predictive Value of Test ,Deoxyglucose ,Coronary Angiography ,Revascularization ,Sensitivity and Specificity ,QT interval ,Electrocardiography ,Fluorodeoxyglucose F18 ,Predictive Value of Tests ,Coronary Circulation ,medicine ,Humans ,ST segment ,Prospective Studies ,Myocardial infarction ,MED/36 - DIAGNOSTICA PER IMMAGINI E RADIOTERAPIA ,Tomography, Emission-Computed, Single-Photon ,Fluorodeoxyglucose ,medicine.diagnostic_test ,business.industry ,Myocardium ,Heart ,Middle Aged ,medicine.disease ,Prospective Studie ,Fluorine Radioisotope ,Glucose ,Positron emission tomography ,Exercise Test ,Female ,Nuclear medicine ,business ,Cardiology and Cardiovascular Medicine ,Emission computed tomography ,Human ,Tomography, Emission-Computed ,medicine.drug - Abstract
Objectives. We evaluated the sensitivity and specificity of exercise induced ST segment elevation for the detection of residual myocardial viability. Background. Assessment of residual viability after myocardial infarction is relevant for establishing indication for revascularization. We have previously shown that exercise-induced ST segment elevation is a marker of residual viability. Methods. We studied 34 patients,vith a previous Q wave myocardial infarction (anterior in 21, inferior in 13) of whom 18 (group A) had exercise-induced ST segment elevation in more than one lead (mean [+/-SD] 1.8 +/- 0.9 mm, range 1 to 4) and 16 (group B) did not. All patients underwent rest technetium-99m methoxyisobutyl isonitrile single-photon emission computed tomography (SPECT), fluorine-18 (F-18) fluorodeoxyglucose positron emission tomography and coronary angiography. The time elapsed between the infarction and the viability study was 72 +/- 108 days (range 15 to 400) in group A and 516 +/- 545 days (range 14 to 1,800) in group B. Results. The presence and site of previous infarction were confirmed by SPECT studies in all 34 patients. Uptake of F-18 fluorodeoxyglucose within the infarcted area was present in 18 of 18 patients in group A but in only 9 (56%) of 16 in group B (p < 0.01). In patients with an anterior infarction, the sensitivity, specificity and predictive accuracy of exercise-induced ST segment elevation for detection of residual viability were 82%, 100% and 86%, respectively (95% confidence intervals 46% to 83.5%, 59% to 100% and 55.6% to 87.1%, respectively). Conclusions. Exercise-induced ST segment elevation in infarct-related leads has a high specificity and acceptable sensitivity for detection of residual viability within the infarcted area. RI Lucignani, Giovanni/C-6773-2008
- Published
- 1995
18. PRESERVED VASODILATOR RESPONSE TO ACETYLCHOLINE IN ATHEROSCLEROTIC CORONARY-ARTERIES BEFORE AND AFTER PTCA
- Author
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Mariosa Xuereb, Gabriele Vicedomini, Alberto Margonato, Robert G. Xuereb, Orazio Carandente, Sergio Chierchia, Andrea Macchi, Macchi, A, Xuereb, Rg, Xuereb, M, Vicedomini, G, Margonato, Alberto, Carandente, O, and Chierchia, Sl
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medicine.medical_specialty ,business.industry ,medicine.medical_treatment ,Vasodilation ,medicine.disease ,Coronary arteries ,Stenosis ,Atheroma ,medicine.anatomical_structure ,In vivo ,Angioplasty ,Internal medicine ,medicine ,Cardiology ,Radiology, Nuclear Medicine and imaging ,medicine.symptom ,Cardiology and Cardiovascular Medicine ,business ,Acetylcholine ,Vasoconstriction ,medicine.drug - Abstract
The vascular response to local administration of acetylcholine is used, clinically, to assess endothelial function in vivo. However, whether this response predominantly reflects the functional state of the vascular endothelium, or rather results from smooth muscle reactivity per se is not clear. In 15 patients with chronic stable angina and angiographically significant coronary disease, we studied the effects of increasing doses of intracoronary acetylcholine (5, 10, 30, 50, and 80 μg) and nitroglycerin (200 μg) on coronary vascular tone. In three patients the protocol was perfrnned at the time of diagnostic coronary angiographv and 7 and 24 hours after angioplasty. The remaining five underwent acetylcholine administration before and after percutaneous transluminl coronary angioplasty (PTCA). We quantitatively assessed the diameter of 54 coronary arterial segments; 12 stenotic segments, 13 post-PICA segments with residual irregularities, 18 reference segments of the ranee arteries taken proximal to the stenosis or to the dilatation site, and II remote segments ofnonstenotic vessels. They all showed a bimodal response to acetylcholine. At the lowest concentration (5 μg) the agent invariably caused dilatation (9.22 ± 6.55%), which was not significantly different in the various segments and was always less than that induced by nitroglycerin (24.56 ± 12.82%, P < 0.0001). At the highest doses (50 or 80 μg) acetylcholine always induced vasoconstriction, which was significantly more pronounced in the post-PTCA (-31.54 ± 10.65%) and stenotic segments (-23.08 ± 11.88%) than in the reference and remote segments (respectively, -14.88 + 7.63% and - 18.67 + 8.37%, P < 0.05). We conclude that: (l) some degree of endothelial dependent vasodilatation is preserved even in the presence of atheroma and intimal injury induced by angioplasty; (2) atheroma and especially acute intimal injury augment the vasoconstrictor response to high dose acetylcholine, the effect being most probably mediated by primary smooth muscle supersensivity: (3) since acetylcholine has direct and endothelium-mediated vasoactive effects, this agent may not be the ideal one for testing endothelial integrity. (J Interven Cardiol 1994; 7:57–64)
- Published
- 1994
19. Prevalence of Opioid Use in Nursing Homes Over the Last Decade: A Systematic Literature Review.
- Author
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Sant AM, Portelli S, Ballard C, Bezzina-Xuereb M, Scerri C, and Sultana J
- Abstract
Background: Despite global concerns of an opioid epidemic, there is no systematic literature review on how frequently these drugs are used in nursing home (NH) populations, including those living with dementia. Objective: This systematic review aims to describe the prevalence and incidence of opioid use in NHs. A secondary objective is to describe the use of these drugs in a subset of NH residents, namely among persons living with dementia. Methods: A systematic literature review was carried out using MEDLINE and Scopus (PROSPERO registration number CRD42021254210). Screening of title and abstract was carried out by 2 persons independently for studies published between January 1, 2011 and May 19, 2021. The main outcomes were annual prevalence, period prevalence, and duration of opioid use. Results: From a total of 178 identified studies, 29 were considered eligible for inclusion. The annual prevalence of any opioid use among all NH residents without any selection criteria ranged from 6.3% to 50% with a median annual prevalence of 22.9% (Q25-Q75: 19.5%-30.2%), based on 17 studies. Five studies measured the annual prevalence in NH residents living with dementia, finding that this ranged from 10% to 39.6%. Conclusions: More evidence is needed quantifying opioid use in NH, especially among persons living with dementia. Given that opioid use in NH is still a problem, implementation of a pain management protocol in NH or nationally would help improve clinical outcomes., Competing Interests: The author(s) declared the following potential conflicts of interest with respect to the research, authorship, and/or publication of this article: C.B. has received honoraria and grant funding from Acadia Pharmaceuticals, Lundbeck, Takeda, and Axovant pharmaceutical companies, not related to this study. C.B. leads the Alzheimer’s disease psychosis (ADP) investigators group and has received honoraria from Lundbeck, Lilly, Otsuka, and Orion pharmaceutical companies, not related to this study. The other authors have no potential conflicts of interests to declare., (© The Author(s) 2023.)
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- 2024
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20. Female gender and cardiovascular disease.
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Xuereb R, Magri CJ, Xuereb S, Xuereb M, Mangion MZ, and Xuereb RG
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- Female, Humans, Risk Factors, Sex Factors, Cardiovascular Diseases diagnosis, Cardiovascular Diseases therapy, Women's Health
- Abstract
Despite a generalized belief that women are protected from cardiovascular disease, this remains the leading cause of death in women. This review focuses on differences in symptomatology, diagnostic modalities and therapeutic strategies in women with regard to cardiovascular disease.
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- 2016
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21. In situ assessment of the setting of tricalcium silicate-based sealers using a dentin pressure model.
- Author
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Xuereb M, Vella P, Damidot D, Sammut CV, and Camilleri J
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- Adolescent, Calcium Phosphates chemistry, Dental Pulp Cavity, Dentin diagnostic imaging, Humans, Materials Testing, Surface Properties, X-Ray Diffraction, Calcium Compounds chemistry, Dentin chemistry, Root Canal Filling Materials chemistry, Silicates chemistry, Zinc Oxide-Eugenol Cement chemistry
- Abstract
Introduction: EndoSequence BC Sealer (Brasseler, Savannah, GA) is a premixed tricalcium silicate-based root canal sealer that requires moisture from the root dentin to hydrate. The aim of this study was to investigate the setting of EndoSequence BC Sealer and other sealers in contact with human dentin in a simulated clinical environment., Methods: EndoSequence BC Sealer, MTA Fillapex (Angelus, Londrina, Brazil), Septodont Sealer (Septodont, Saint Maur-des-Fosses, France), and Apexit Plus (Ivoclar, Schaan, Lichtenstein) were assessed. Caries-free lower premolars extracted for orthodontic purposes in patients aged 13-16 years were standardized to a 10-mm root length and were filled with test sealers and set up in a dentin pressure model for 14 days. In addition, set sealers immersed in physiologic solution for 14 days were also assessed. The set materials in solution and materials retrieved from the dentin pressure setup were characterized by scanning electron microscopy and X-ray diffraction analysis. The setting time and radiopacity were assessed using ISO 6876:2002 specifications. Furthermore, mineral ion leaching was evaluated by inductively coupled plasma mass spectrometry., Results: All the sealers tested exhibited formation of a calcium phosphate phase when in contact with physiologic solution. Septodont Sealer and Apexit Plus did not exhibit the formation of a calcium phosphate phase in the dentin pressure setup. The fluid in the system was enough to allow the setting of EndoSequence BC Sealer, which did not set in a dry environment. All materials leached calcium with the Septodont Sealer, exhibiting double the calcium ion leaching compared with EndoSequence BC Sealer., Conclusions: Using the dentinal fluid pressure system resulted in an adequate flow of dentinal fluid that allowed EndoSequence BC Sealer to set inside the root canal. Although the sealers tested were tricalcium silicate based, the hydration reaction and bioactivity in the presence of dentinal fluid were different to hydration in vitro. Thus, clinically, material bioactivity cannot be assumed., (Copyright © 2015 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.)
- Published
- 2015
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22. Systematic review of current dental implant coating materials and novel coating techniques.
- Author
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Xuereb M, Camilleri J, and Attard NJ
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- Dental Prosthesis Design, Electrochemical Techniques, Humans, Plasma Gases chemistry, Surface Properties, Coated Materials, Biocompatible chemistry, Dental Implants, Dental Materials chemistry
- Abstract
Purpose: Titanium dental implants have a high success rate; however, there are instances when a modified surface may be desirable. The aim of this article was to systematically review the different types of implant coatings that have been studied clinically, in vivo and in vitro, and the coating techniques being implemented., Materials and Methods: The literature was searched electronically and manually through The Cochrane Library, Medline, and PubMed databases to identify articles studying dental implant surfaces and coating techniques. The database search strategy revealed 320 articles, of which 52 articles were considered eligible--40 in relation to implant coatings and 12 to the coating technique. An additional 30 articles were retrieved by hand search., Results: Several materials were identified as possible candidates for dental implant coatings; these include carbon, bisphosphonates, bone stimulating factors, bioactive glass and bioactive ceramics, fluoride, hydroxyapatite (HA) and calcium phosphate, and titanium/titanium nitride. HA coatings still remain the most biocompatible coatings even though the more innovative bioglass suggests promising results. The most common coating techniques are plasma spraying and hydrocoating. More recent techniques such as the nanoscale technology are also discussed., Conclusions: Several implant coatings have been proposed, and some appear to give better clinical results and improved properties than others. Clinical trials are still required to provide compelling evidence-based results for their long-term successful outcomes.
- Published
- 2015
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23. Late presentation and successful treatment of classical scimitar syndrome.
- Author
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Grech V, Xuereb R, Xuereb M, Manche A, Schembri K, and Degiovanni J
- Abstract
Scimitar syndrome is a form of partial anomalous pulmonary venous drainage that is dramatically visible on plain chest radiography (CXR). In these individuals the entire venous drainage from the right lung enters a single anomalous large vein that descends to the inferior vena cava. This descending vein is visible on CXR as a curvilinear density along the right heart border and resembles the curved Turkish sword that gives the condition its name. Scimitar syndrome forms part of the large spectrum of associated conditions known as venolobar syndrome. These include right lung hypoplasia or sequestered segments of right lung, congenital heart disease and various others. We report the case of a young woman who presented incidentally, with a murmur, at 16 years of age. Full investigation including angiography showed a large atrial septal defect with right heart dilation and scimitar syndrome. She underwent surgical correction with uneventful and complete correction by baffling of the scimitar vein from its entry into the inferior vena to the left atrium through the enlarged atrial septal defect.
- Published
- 2003
24. Specificity and sensitivity of exercise-induced ST segment elevation for detection of residual viability: comparison with fluorodeoxyglucose and positron emission tomography.
- Author
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Margonato A, Chierchia SL, Xuereb RG, Xuereb M, Fragasso G, Cappelletti A, Landoni C, Lucignani G, and Fazio F
- Subjects
- Coronary Angiography, Coronary Circulation physiology, Deoxyglucose analogs & derivatives, Female, Fluorine Radioisotopes, Fluorodeoxyglucose F18, Glucose metabolism, Humans, Male, Middle Aged, Myocardial Infarction diagnostic imaging, Myocardium metabolism, Predictive Value of Tests, Prospective Studies, Sensitivity and Specificity, Technetium Tc 99m Sestamibi, Tomography, Emission-Computed, Single-Photon, Electrocardiography, Exercise Test, Heart diagnostic imaging, Myocardial Infarction diagnosis, Tomography, Emission-Computed
- Abstract
Objectives: We evaluated the sensitivity and specificity of exercise-induced ST segment elevation for the detection of residual myocardial viability., Background: Assessment of residual viability after myocardial infarction is relevant for establishing indication for revascularization. We have previously shown that exercise-induced ST segment elevation is a marker of residual viability., Methods: We studied 34 patients with a previous Q wave myocardial infarction (anterior in 21, inferior in 13) of whom 18 (group A) had exercise-induced ST segment elevation in more than one lead (mean [+/- SD] 1.8 +/- 0.9 mm, range 1 to 4) and 16 (group B) did not. All patients underwent rest technetium-99m methoxyisobutyl isonitrile single-photon emission computed tomography (SPECT), fluorine-18 (F-18) fluorodeoxyglucose positron emission tomography and coronary angiography. The time elapsed between the infarction and the viability study was 72 +/- 108 days (range 15 to 400) in group A and 516 +/- 545 days (range 14 to 1,800) in group B., Results: The presence and site of previous infarction were confirmed by SPECT studies in all 34 patients. Uptake of F-18 fluorodeoxyglucose within the infarcted area was present in 18 of 18 patients in group A but in only 9 (56%) of 16 in group B (p < 0.01). In patients with an anterior infarction, the sensitivity, specificity and predictive accuracy of exercise-induced ST segment elevation for detection of residual viability were 82%, 100% and 86%, respectively (95% confidence intervals 46% to 83.5%, 59% to 100% and 55.6% to 87.1%, respectively)., Conclusions: Exercise-induced ST segment elevation in infarct-related leads has a high specificity and acceptable sensitivity for detection of residual viability within the infarcted area.
- Published
- 1995
- Full Text
- View/download PDF
25. Antiischemic effects of intravenous diazepam in patients with coronary artery disease.
- Author
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Rossetti E, Fragasso G, Xuereb RG, Xuereb M, Margonato A, and Chierchia SL
- Subjects
- Adult, Aged, Diazepam administration & dosage, Exercise Test drug effects, Female, Heart Rate drug effects, Humans, Injections, Intravenous, Male, Middle Aged, Myocardial Ischemia prevention & control, Coronary Disease drug therapy, Diazepam therapeutic use, Myocardial Ischemia drug therapy
- Abstract
Diazepam (DZP) is commonly used in treatment of patients with acute ischemic syndromes to allay anxiety, but benzodiazepines reduce myocardial contractility and increase myocardial blood flow. To investigate the antiischemic effect of DZP, we studied 13 patients with a positive exercise test and angiographically documented coronary artery disease. All patients were submitted to a randomized, placebo-controlled trial using 0.9% NaCl infusion as placebo and intravenous (i.v.) diazepam (0.1 mg/kg in 20 min). Exercise tests performed immediately after the infusions showed that as compared with placebo, DZP significantly prolonged time to 1-mm ST-segment depression (557 +/- 198 vs. 428 +/- 226 s, p < 0.0001) and total exercise duration (624 +/- 177 vs. 561 +/- 188 s, p < 0.007). Rate-pressure product (RPP) at 1-mm ST-segment depression was not significantly different with the two treatments. DZP significantly delays onset of exercise-induced myocardial ischemia in patients with coronary artery disease. Because RPP at onset of ischemia was similar to that recorded with placebo despite greater levels of external workload, the antiischemic action of DZP appears to be mediated, at least partially, by a reduction in myocardial oxygen consumption.
- Published
- 1994
- Full Text
- View/download PDF
26. Blockade of natural and neuropeptide Y-induced carbohydrate feeding by a receptor antagonist PYX-2.
- Author
-
Leibowitz SF, Xuereb M, and Kim T
- Subjects
- Anesthesia, Animals, Dietary Fats, Dietary Proteins, Dose-Response Relationship, Drug, Male, Neuropeptide Y pharmacology, Paraventricular Hypothalamic Nucleus drug effects, Rats, Rats, Sprague-Dawley, Stereotaxic Techniques, Dietary Carbohydrates, Eating drug effects, Neuropeptide Y analogs & derivatives, Neuropeptide Y antagonists & inhibitors, Peptide Fragments pharmacology, Receptors, Neuropeptide Y antagonists & inhibitors
- Abstract
Neuropeptide Y (NPY injected into the paraventricular nucleus (PVN) of rats has a potent stimulatory effect specifically on carbohydrate intake. This study examined the behavioral effects of a newly synthesized NPY antagonist, PYX-2. After PVN injection of PYX-2 (50-900 pmoles) alone, a strong dose-dependent reduction in spontaneous carbohydrate intake at the onset of the dark cycle was observed in freely-feeding rats. Moreover, at even lower doses (12.5 and 25.0 pmoles), PYX-2 also blocked the stimulatory action of PVN NPY (100 pmoles) on carbohydrate ingestion. These results provide the first evidence for the existence of endogenous NPY receptors in mediating the action of exogenous NPY in the hypothalamus. They also constitute a crucial step in demonstrating a physiological function of these PVN NPY receptors specifically in controlling carbohydrate ingestion at the onset of the natural feeding cycle.
- Published
- 1992
- Full Text
- View/download PDF
27. [Cerebellar hemorrhage and unilateral asterixis].
- Author
-
Pullicino P, Xuereb M, and Farrugia B
- Subjects
- Aged, Female, Humans, Hypertension complications, Cerebellar Diseases complications, Cerebral Hemorrhage complications, Movement Disorders etiology
- Abstract
A hypertensive woman presented with asterixis ipsilateral to a cerebellar hemorrhage. Asterixis has not previously been described in association with a cerebellar lesion. The presence of asterixis in this patient may have been due to a reduction of afferent information through the loss of the dentato-thalamo-cortical input. Unilateral asterixis denotes a dysfunction of the mechanism underlying sustained muscular contraction and not a precise cerebral localisation.
- Published
- 1990
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