13 results on '"Florian Nima Fleckenstein"'
Search Results
2. Percutaneous Computed Tomography (CT) Fluoroscopy-Guided Biopsy of the Spleen Using Fibrin Glue as a Sealant
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Laura Segger, Markus Herbert Lerchbaumer, Federico Collettini, Bernd Hamm, Florian Nima Fleckenstein, Uli Fehrenbach, Bernhard Gebauer, and Timo A. Auer
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percutaneous image-guided biopsy ,biopsy of the spleen ,CT-guided intervention ,splenic lesions ,Medicine (General) ,R5-920 - Abstract
Some authors consider the risk of bleeding an absolute contraindication to percutaneous image-guided splenic puncture. While splenic punctures are mainly performed at specialized centers, no technique for the closure of the puncture tract has been broadly established. The aim of this study was to investigate the effectiveness and safety of a percutaneous image-guided biopsy of the spleen using fibrin glue to plug the tract. A total of 27 requests for splenic image-guided interventions were identified between 2010 and 2021 and considered for inclusion in our retrospective single-center study. Seven patients needed to be excluded, which left twenty patients who underwent a percutaneous computed tomography (CT) fluoroscopy-guided biopsy of a splenic lesion during this period. In all patients, a 17G coaxial needle with an 18G core biopsy needle was used. Diagnostic adequacy and accuracy were evaluated, and complications were classified using the CIRSE classification system for adverse events. Diagnostic adequacy was 100% (20/20), and a median of four samples were collected. Diagnostic accuracy was 80% (16/20). The four off-target samples included one inconclusive finding and three samples of regular spleen tissue. The overall complication rate was 5% (1/20). No mild (grade 1–2) or moderate (grade 3–4) complications occurred. One severe (grade 5–6) complication occurred. Although controversial and potentially high-risk, diagnostic percutaneous biopsies of the spleen appear to be relatively safe with the use of fibrin glue to seal the tract.
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- 2024
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3. A prospective randomized controlled trial assessing the effect of music on patients’ anxiety in venous catheter placement procedures
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Florian Nima Fleckenstein, Agnes Klara Böhm, Federico Collettini, Anne Frisch, Willie Magnus Lüdemann, Elif Can, Bernhard Gebauer, and Martin Jonczyk
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Medicine ,Science - Abstract
Abstract The aim of the study was to assess the influence of music on anxiety levels compared to standard patient care in patients undergoing venous catheter placement procedures. This prospective randomized controlled trial included patients undergoing placement procedures for peripherally inserted central venous catheters (PICC), ports and central venous catheters (CVC). Patients were randomly assigned to a music intervention group (MIG) and a control group (CTRL). State and trait anxiety levels were assessed as primary outcome using the state-trait anxiety inventory (STAI) before and after the procedures. Secondary outcomes comprised averaged heart rate for all participants and time of radiological surveillance for port placement procedures exclusively. 72 participants were included into the final analysis (MIG n = 40; CTRL n = 32). All procedures were successful and no major complications were reported. Mean levels for post-interventional anxieties were significantly lower in the MIG compared to the CTRL (34.9 ± 8.9 vs. 44 ± 12.1; p
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- 2022
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4. Changes of radiological examination volumes over the course of the COVID-19 pandemic: a comprehensive analysis of the different waves of infection
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Florian Nima Fleckenstein, Tazio Maleitzke, Georg Böning, Vinzent Kahl, Alexandra Petukhova-Greenstein, Ahmet Said Kucukkaya, Bernhard Gebauer, Bernd Hamm, and Annette Aigner
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SARS-CoV-2 ,Lockdown ,Public Health ,Crisis ,Healthcare ,Medical physics. Medical radiology. Nuclear medicine ,R895-920 - Abstract
Abstract Objectives Data from radiological departments provide important information on overall quantities of medical care provided. With this study we used a comprehensive analysis of radiological examinations as a surrogate marker to quantify the effect of the different COVID-19 waves on medical care provided. Methods Radiological examination volumes during the different waves of infection were compared among each other as well as to time-matched control periods from pre-pandemic years using a locally weighted scatterplot smoothing as well as negative binominal regression models. Results A total of 1,321,119 radiological examinations were analyzed. Examination volumes were reduced by about 10% over the whole study period (IRR = 0.90; 95% CI 0.89–0.92), with a focus on acute medical care (0.84; 0.83–0.85) and outpatients (0.93: 0.90–0.97). When compared to wave 1, examination volumes were about 17% higher during wave 2 (1.17; 1.10–1.25), and 33% higher in wave 3 of the pandemic (1.33; 1.24–1.42). Conclusions This study shows the severe effect of COVID-19 pandemic and related shutdown measures on overall provided medical care as measured by radiological examinations. When compared, the decrease of medical care was more pronounced in the earlier waves of the pandemic.
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- 2022
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5. Routine laboratory parameters predict intensive care unit admission and hospitalization in patients suffering stab injuries
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Tazio Maleitzke, Sijia Zhou, Dario Zocholl, Florian Nima Fleckenstein, David Alexander Back, Julius Maximilian Plewe, Jérôme Weber, Tobias Winkler, Ulrich Stöckle, Serafeim Tsitsilonis, and Sven Märdian
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trauma ,knife ,penetrating ,blood ,serum biochemistry ,coagulation ,Immunologic diseases. Allergy ,RC581-607 - Abstract
BackgroundKnife crime has increased considerably in recent years in Northern Europe. Affected patients often require immediate surgical care due to traumatic organ injury. Yet, little is known about clinically relevant routine laboratory parameters in stab injury patients and how these are associated with intensive care unit (ICU) admission, hospitalization and number of surgeries.MethodsWe retrospectively analyzed 258 stab injury cases between July 2015 and December 2021 at an urban Level I Trauma Center. Annual and seasonal incidences, injury site, injury mechanism, Injury Severity Score (ISS), and surgical management were evaluated. First, correlations between routine laboratory parameters for hematology, coagulation, and serum biochemistry (peak, and Δ (change from admission to peak within 3 days following admission)) and length of hospital stay, ICU stay, and number of surgeries were assessed using Spearman’s rank correlation coefficients. Second, multivariable Least Absolute Shrinkage and Selection Operator (LASSO) regression analyses were conducted to identify parameters predictive of clinical outcomes. Third, longitudinal developments of routine laboratory parameters were assessed during hospital admission.ResultsIn 2021, significantly more stab injuries were recorded compared with previous years and occurred less during winter compared with other seasons. Mean ISS was 8.3 ± 7.3, and ISS was positively correlated with length of hospital and ICU stay (r = 0.5–0.8, p < 0.001). Aspartate transaminase (AST) (Δ) (r = 0.690), peak C-reactive protein (CrP) (r = 0.573), and erythrocyte count (Δ) (r = 0.526) showed the strongest positive correlations for length of ICU stay for penetrating, thoracoabdominal, and organ injuries, respectively. No correlations were observed between routine laboratory parameters and number of surgeries. For patients with penetrating injuries, LASSO-selected predictors of ICU admission included ISS, pH and lactate at admission, and Δ values for activated partial thromboplastin time (aPTT), K+, and erythrocyte count. CrP levels on day 3 were significantly higher in patients with penetrating (p = 0.005), thoracoabdominal (p = 0.041), and organ injuries (p < 0.001) compared with those without.ConclusionOur data demonstrate an increase in stab injury cases in 2021 and an important link between changes in routine laboratory parameters and ICU admission and hospitalization. Monitoring ISS and changes in AST, CrP, erythrocyte count, pH, lactate, aPTT, and K+ may be useful to identify patients at risk and adjust surgical and ICU algorithms early on.
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- 2023
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6. Quality and quantity of serious violent suicide attempts during the COVID-19 pandemic
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Tazio Maleitzke, Dario Zocholl, Tobias Topp, Annika Dimitrov-Discher, Elly Daus, Gabriel Reaux, Malin Zocholl, Rolf Nicolas Conze, Moritz Kolster, Philipp Weber, Florian Nima Fleckenstein, Louise Scheutz Henriksen, Ulrich Stöckle, Thomas Fuchs, Denis Gümbel, Nikolai Spranger, Alexander Ringk, and Sven Märdian
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injury ,death ,mortality ,SARS-CoV-2 ,violent suicide attempts ,COVID-19 ,Psychiatry ,RC435-571 - Abstract
BackgroundWhile repeated shutdown and lockdown measures helped contain the spread of SARS-CoV-2 during the COVID-19 pandemic, social distancing and self-isolation negatively impacted global mental health in 2020 and 2021. Although suicide rates did reportedly not increase during the first months of the pandemic, long-term data, and data on the quality of serious violent suicide attempts (SVSAs) are not available to date.Materials and methodsOrthopaedic trauma patient visits to the emergency department (ED), ED trauma team activations, and SVSAs were retrospectively evaluated from January 2019 until May 2021 in four Level-I Trauma Centers in Berlin, Germany. SVSAs were assessed for suicide method, injury pattern and severity, type of treatment, and length of hospital stay.ResultsSignificantly fewer orthopaedic trauma patients presented to EDs during the pandemic (n = 70,271) compared to the control (n = 84,864) period (p = 0.0017). ED trauma team activation numbers remained unchanged. SVSAs (corrected for seasonality) also remained unchanged during control (n = 138) and pandemic (n = 129) periods, and no differences were observed for suicide methods, injury patterns, or length of hospital stay.ConclusionOur data emphasize that a previously reported rise in psychological stress during the COVID-19 pandemic does not coincide with increased SVSA rates or changes in quality of SVSAs.
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- 2022
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7. Haematoma block: a safe method for pre-surgical reduction of distal radius fractures
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Tazio Maleitzke, Fabian Plachel, Florian Nima Fleckenstein, Florian Wichlas, and Serafeim Tsitsilonis
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Distal radius fracture ,Haematoma block ,Local anaesthetic ,Closed reduction ,Orthopedic surgery ,RD701-811 ,Diseases of the musculoskeletal system ,RC925-935 - Abstract
Abstract Background The haematoma block (HB) has been successfully used to minimise pain prior to otherwise painful closed reduction manoeuvres for distal radius fractures. However, the invasive manner of the procedure, which technically produces an open fracture, still raises the question, whether HBs increase the risk of infection compared to conventional intravenous analgesia (IA). The purpose of this study was to assess complication rates and safety of the HB procedure for the closed reduction of surgically treated distal radius fractures. Methods We included 176 distal radius fractures in 170 patients in a retrospective mono-centric study, who underwent closed reduction and casting followed by definitive surgical care over a period of two years. Patients either received a HB or IA before closed reduction and were evaluated for minor and major complications over a follow-up period of four years. Results Overall, 42 distal radius fractures were treated with a HB (23.9%) and 134 with IA (76.1%) before closed reduction. There were a single major (2.3%) and eight minor (19%) complications observed in the HB group compared to two major (1.4%) and 24 minor (17.9%) complications in the IA group. No significant differences were identified between the two groups. Sex and type of fracture had no effect on complication rates, however, younger patients experienced higher complication rates in comparison to older ones (p = 0.035). Conclusion According to our data, the apprehensions that clinicians may have of creating open fractures through HB procedures, are unnecessary and may be abandoned confidently.
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- 2020
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8. The Impact of Histone Modifications in Endometriosis Highlights New Therapeutic Opportunities
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Iason Psilopatis, Kleio Vrettou, Florian Nima Fleckenstein, and Stamatios Theocharis
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histone ,deacetylase ,inhibitor ,endometriosis ,therapy ,Cytology ,QH573-671 - Abstract
Endometriosis is a chronic disorder of the female reproductive system which afflicts a great number of women worldwide. Histone deacetylases (HDACs) prevent the relaxation of chromatin, thereby positively or negatively modulating gene transcription. The current review aims at studying the impact of histone modifications and their therapeutic targeting in endometriosis. In order to identify relevant studies, a literature review was conducted using the MEDLINE and LIVIVO databases. The current manuscript represents the most comprehensive, up-to-date review of the literature focusing on the particular role of HDACs and their inhibitors in the context of endometriosis. HDAC1, HDAC2, HDAC3, Sirtuin 1, and Sirtuin 3, are the five most studied HDAC enzymes which seem to, at least partly, influence the pathophysiology of endometriosis. Both well-established and novel HDACIs could possibly represent modern, efficacious anti-endometriotic drug agents. Altogether, histone modifications and their therapeutic targeting have been proven to have a strong impact on endometriosis.
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- 2023
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9. The Role of Peroxisome Proliferator-Activated Receptors in Preeclampsia
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Iason Psilopatis, Kleio Vrettou, Florian Nima Fleckenstein, and Stamatios Theocharis
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peroxisome proliferator-activated receptor (PPAR) ,preeclampsia ,Cytology ,QH573-671 - Abstract
Preeclampsia is a common pregnancy-related hypertensive disorder. Often presenting as preexisting or new-onset hypertension complicated by proteinuria and/or end-organ dysfunction, preeclampsia significantly correlates with maternal and perinatal morbidity and mortality. Peroxisome proliferator-activated receptors (PPARs) are nuclear receptor proteins that regulate gene expression. In order to investigate the role of PPARs in the pathophysiology of preeclampsia, we conducted a literature review using the MEDLINE and LIVIVO databases. The search terms “peroxisome proliferator-activated receptor”, “PPAR”, and “preeclampsia” were employed and we were able to identify 35 relevant studies published between 2002 and 2022. Different study groups reached contradictory conclusions in terms of PPAR expression in preeclamptic placentae. Interestingly, PPARγ agonists alone, or in combination with well-established pharmaceutical agents, were determined to represent novel, potent anti-preeclamptic treatment alternatives. In conclusion, PPARs seem to play a significant role in preeclampsia.
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- 2023
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10. CT-Based Risk Stratification for Intensive Care Need and Survival in COVID-19 Patients—A Simple Solution
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Clarissa Hosse, Laura Büttner, Florian Nima Fleckenstein, Christina Maria Hamper, Martin Jonczyk, Oriane Scholz, Annette Aigner, and Georg Böning
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COVID-19 ,SARS-CoV-2 ,CT ,quantification ,risk assessment ,intensive care ,Medicine (General) ,R5-920 - Abstract
We evaluated a simple semi-quantitative (SSQ) method for determining pulmonary involvement in computed tomography (CT) scans of COVID-19 patients. The extent of lung involvement in the first available CT was assessed with the SSQ method and subjectively. We identified risk factors for the need of invasive ventilation, intensive care unit (ICU) admission and for time to death after infection. Additionally, the diagnostic performance of both methods was evaluated. With the SSQ method, a 10% increase in the affected lung area was found to significantly increase the risk for need of ICU treatment with an odds ratio (OR) of 1.68 and for invasive ventilation with an OR of 1.35. Male sex, age, and pre-existing chronic lung disease were also associated with higher risks. A larger affected lung area was associated with a higher instantaneous risk of dying (hazard ratio (HR) of 1.11) independently of other risk factors. SSQ measurement was slightly superior to the subjective approach with an AUC of 73.5% for need of ICU treatment and 72.7% for invasive ventilation. SSQ assessment of the affected lung in the first available CT scans of COVID-19 patients may support early identification of those with higher risks for need of ICU treatment, invasive ventilation, or death.
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- 2021
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11. Submillisievert chest CT in patients with COVID-19 - experiences of a German Level-I center
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Christina M. Hamper, Florian Nima Fleckenstein, Laura Büttner, Bernd Hamm, Nadine Thieme, Hans-Martin Thiess, Oriane Scholz, Felix Döllinger, and Georg Böning
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COVID-19 ,Low-dose chest CT ,Dose reduction ,SARS-CoV2 ,German Level-I center ,Coronavirus ,Medical physics. Medical radiology. Nuclear medicine ,R895-920 - Abstract
Purpose: Computed tomography (CT) is used for initial diagnosis and therapy monitoring of patients with coronavirus disease 2019 (COVID-19). As patients of all ages are affected, radiation dose is a concern. While follow-up CT examinations lead to high cumulative radiation doses, the ALARA principle states that the applied dose should be as low as possible while maintaining adequate image quality. The aim of this study was to evaluate parameter settings for two commonly used CT scanners to ensure sufficient image quality/diagnostic confidence at a submillisievert dose. Materials and methods: We retrospectively analyzed 36 proven COVID-19 cases examined on two different scanners. Image quality was evaluated objectively as signal-to-noise ratio (SNR)/contrast-to-noise ratio (CNR) measurement and subjectively by two experienced, independent readers using 3-point Likert scales. CT dose index volume (CTDIvol) and dose-length product (DLP) were extracted from dose reports, and effective dose was calculated. Results: With the tested parameter settings we achieved effective doses below 1 mSv (median 0.5 mSv, IQR: 0.2 mSv, range: 0.3−0.9 mSv) in all 36 patients. Thirty-four patients had typical COVID-19 findings. Both readers were confident regarding the typical COVID-19 CT-characteristics in all cases (3 ± 0). Objective image quality parameters were: SNRnormal lung: 17.0 ± 5.9, CNRGGO/normal lung: 7.5 ± 5.0, and CNRconsolidation/normal lung: 15.3 ± 6.1. Conclusion: With the tested parameters, we achieved applied doses in the submillisievert range, on two different CT scanners without sacrificing diagnostic confidence regarding COVID-19 findings.
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- 2020
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12. Renal Cell Carcinoma Metastatic to the Liver: Early Response Assessment after Intraarterial Therapy Using 3D Quantitative Tumor Enhancement Analysis
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Florian Nima Fleckenstein, Rüdiger Egbert Schernthaner, Rafael Duran, Jae Ho Sohn, Sonia Sahu, Karen Marshall, MingDe Lin, Bernhard Gebauer, Julius Chapiro, Riad Salem, and Jean-François Geschwind
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Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
PURPOSE: Liver metastases from renal cell carcinoma (RCC) are not uncommon in the course of disease. However, data about tumor response to intraarterial therapy (IAT) are scarce. This study assessed whether changes of enhancing tumor volume using quantitative European Association for the Study of the Liver (qEASL) on magnetic resonance imaging (MRI) and computed tomography (CT) can evaluate tumor response and predict overall survival (OS) early after therapy. METHODS AND MATERIALS: Fourteen patients with liver metastatic RCC treated with IAT (transarterial chemoembolization: n= 9 and yttrium-90: n= 5) were retrospectively included. All patients underwent contrast-enhanced imaging (MRI: n= 10 and CT: n= 4) 3 to 4 weeks pre- and posttreatment. Response to treatment was evaluated on the arterial phase using Response Evaluation Criteria in Solid Tumors (RECIST), World Health Organization, modified RECIST, EASL, tumor volume, and qEASL. Paired t test was used to compare measurements pre- and post-IAT. Patients were stratified into responders (≥65% decrease in qEASL) and nonresponders (
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- 2016
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13. Diagnostic Value of Initial Chest CT Findings for the Need of ICU Treatment/Intubation in Patients with COVID-19
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Laura Büttner, Annette Aigner, Florian Nima Fleckenstein, Christina Maria Hamper, Martin Jonczyk, Bernd Hamm, Oriane Scholz, and Georg Böning
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COVID-19 ,SARS-CoV-2 ,ventilation ,CT ,ICU ,intubation ,Medicine (General) ,R5-920 - Abstract
Computed tomography (CT) plays an important role in the diagnosis of COVID-19. The aim of this study was to evaluate a simple, semi-quantitative method that can be used for identifying patients in need of subsequent intensive care unit (ICU) treatment and intubation. We retrospectively analyzed the initial CT scans of 28 patients who tested positive for SARS-CoV-2 at our Level-I center. The extent of lung involvement on CT was classified both subjectively and with a simple semi-quantitative method measuring the affected area at three lung levels. Competing risks Cox regression was used to identify factors associated with the time to ICU admission and intubation. Their potential diagnostic ability was assessed with receiver operating characteristic (ROC)/area under the ROC curves (AUC) analysis. A 10% increase in the affected lung parenchyma area increased the instantaneous risk of intubation (hazard ratio (HR) = 2.00) and the instantaneous risk of ICU admission (HR 1.73). The semi-quantitative measurement outperformed the subjective assessment diagnostic ability (AUC = 85.6% for ICU treatment, 71.9% for intubation). This simple measurement of the involved lung area in initial CT scans of COVID-19 patients may allow early identification of patients in need of ICU treatment/intubation and thus help make optimal use of limited ICU/ventilation resources in hospitals.
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- 2020
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