Publications by authors named "Mohammad Sherif"

Article Synopsis
  • Intra-atrial shunts are linked to a higher risk of embolic strokes, and this study compares outcomes of shunt occlusion between younger (≤50 years) and older (>50 years) patients with a history of paradoxical embolism.
  • The study analyzed data from 187 patients who underwent shunt occlusion from 2013 to 2023, revealing that older patients had more cardiovascular risk factors but similar shunt characteristics and procedural outcomes compared to younger patients.
  • Follow-up results showed low recurrence rates of arterial embolism and no significant outcome differences between high-volume and low-volume shunts in older patients, suggesting similar safety and efficacy for both age groups.
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Article Synopsis
  • Percutaneous interventional left atrial appendage occlusion (LAAO) is a proven method for preventing strokes in patients with atrial fibrillation (AF) and has been evaluated in a study involving 149 patients at a Berlin hospital from 2016 to 2022.
  • The study compared two types of devices used in LAAO: single-occlusive plug-type (SOPT) and dual-occlusive disc-type (DODT), noting that while DODT procedures took longer, both had successful implantation with low rates of complications and no hospital deaths.
  • After six months, findings indicated that SOPT had a higher rate of device-related thrombus formation compared
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Introduction: There is a lack of real-world data directly comparing different valve prostheses for transaortic valve replacement (TAVR). We aimed to compare early clinical outcomes at 30-days between the self-expandable Portico valve (Abbott) with the balloon-expandable Edwards Sapien 3 valve (Edwards Lifesciences) (ES3).

Methods: Out of 1,901 patients undergoing TAVR between January 2018 and December 2021, all patients who received either Portico valve or ES3 valve via transfemoral TAVR were matched using nearest-neighbor (1:1) propensity scoring.

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Background: Mitral transcatheter edge-to-edge repair (M-TEER) is a guideline-recommended treatment option for patients with severe symptomatic mitral regurgitation (MR). Outcomes with the PASCAL system in a post-market setting have not been established.

Objectives: The authors report 30-day and 1-year outcomes from the MiCLASP (Transcatheter Repair of Mitral Regurgitation with Edwards PASCAL Transcatheter Valve Repair System) European post-market clinical follow-up study.

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Article Synopsis
  • This study compares the outcomes of two self-expanding transcatheter heart valve systems (ACURATE and EVOLUT) in patients undergoing valve-in-valve (ViV) procedures for degenerated surgical prostheses.
  • A total of 835 patients across 20 centers were analyzed, with key outcomes including technical success, device success, and 30-day mortality rates evaluated between the two groups.
  • Results showed that while overall procedural outcomes were similar, specific diameter measurements influenced device success differently between the two valve systems.
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Identification of occult lymph node metastasis is challenging in early tongue cancers. We conducted a prospective study to determine the most characteristics ultrasonic feature suggestive of metastatic node. A preliminary study based on feasibility was planned on twenty five patients with squamous cell carcinoma of tongue (T1,T2) and N0 neck underwent ultrasonography of neck.

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Background: "Depth of invasion" is an additional index incorporated in 8th AJCC staging system for oral cavity squamous cell carcinoma based on its prognostic significance. Pre-operative assessment by clinical palpation and imaging modalities has been used with limitations. The aim of the study is to compare different techniques including clinical palpation, ultrasound, and magnetic resonance imaging with histopathology for assessment of depth of tumor invasion.

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We report on a 72 years old male patient with recurrent heart failure hospitalizations caused by severe mitral regurgitation due to severe restriction of the posterior mitral leaflet treated with the transfemoral mitral valve replacement (TMVR) system Cardiovalve. Immediate interventional success was obtained resulting in a quick mobilization and discharge.

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Background: In most cases of transcatheter valve embolization and migration (TVEM), the embolized valve remains in the aorta after implantation of a second valve into the aortic root. There is little data on potential late complications such as valve thrombosis or aortic wall alterations by embolized valves.

Aims: The aim of this study was to analyze the incidence of TVEM in a large cohort of patients undergoing transcatheter aortic valve implantation (TAVI) and to examine embolized valves by computed tomography (CT) late after TAVI.

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Background: Recent case reports and small studies have reported activation of the magnet-sensitive switches in cardiovascular implantable electronic devices (CIEDs) by the new iPhone 12 series, initiating asynchronous pacing in pacemakers and suspension of antitachycardia therapies in implantable cardioverter-defibrillators (ICDs).

Objective: The purpose of this prospective single-center observational study was to quantify the risk of magnetic field interactions of the iPhone 12 with CIEDs.

Methods: A representative model of each CIED series from all manufacturers was tested ex vivo.

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Aim: Wearable cardioverter defibrillator (WCD, LifeVest, and Zoll) therapy has become a useful tool to bridge a temporarily increased risk for sudden cardiac death. However, despite extensive use, there is a lack of evidence whether patients with myocarditis and impaired LVEF may benefit from treatment with a WCD.

Methods And Results: We conducted a single-centre retrospective observational study analysing patients with a WCD prescribed between September 2015 and April 2020 at our institution.

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Increased risk of cardiovascular complications during and post-COVID-19 infection is more and more recognized-including myocarditis, arrhythmias, and myocardial infarctions (MIs). The mechanisms leading to these complications are direct virus-induced injuries, as well as potential thrombotic and inflammatory-induced mechanisms. To the latter, inflammatory plaque instability and plaque rupture are discussed entities contributing to MI-induced post-COVID-19 complications.

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Aims: This study aimed to evaluate the impact of coronavirus disease 2019 (Covid-19) outbreak on admissions for acute myocardial infarction (AMI) and related mortality, severity of presentation, major cardiac complications and outcome in a tertiary-care university hospital in Berlin, Germany.

Methods And Results: In a single-centre cross-sectional observational study, we included 355 patients with AMI containing ST-elevation or non-ST-elevation myocardial infarction (STEMI or NSTEMI), admitted for emergency cardiac catheterization between January and April 2020 and the equivalent time in 2019. During the early phase of the Covid-19 pandemic (e-COV) in Berlin (March and April 2020), admissions for AMI halved compared with those in the pre-Covid-19 time (January and February 2020; pre-COV) and with those in the corresponding months in 2019.

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Article Synopsis
  • Atrial contractile dysfunction in hypertensive heart disease (HHD) negatively affects prognosis, but the specific cellular mechanisms behind atrial remodeling in HHD remain unclear, prompting investigations in a pig model.
  • Studies show that HHD leads to significant loss of contractile function in both the left (LA) and right atrium (RA), with the LA showing reduced contraction amplitude linked to lower intracellular calcium release, while RA maintained calcium levels but increased calcium pump activity.
  • The inhibition of the sodium-calcium exchanger (NCX) in LA myocytes improved calcium release, highlighting a potential therapeutic strategy for enhancing atrial function in patients with HHD.
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Article Synopsis
  • Transcatheter aortic valve replacement (TAVR) is a treatment for high-risk patients with severe aortic valve stenosis, with atrial fibrillation (AF) being common among them, increasing the risk of bleeding complications due to anticoagulation therapy.
  • A study of 283 TAVR patients showed that those with AF experienced nearly three times more major vascular complications and life-threatening bleeding compared to those with normal sinus rhythm.
  • Patients with AF also had significantly higher overall mortality rates within the first month and year after the procedure, indicating the need for further research into optimal anticoagulation strategies.
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Background: The aim of this study was to compare treatment of moderate to severe symptomatic mitral regurgitation (MR) with either conventional surgery or the mitral valve edge-to-edge device (MitraClip®) in very elderly patients. The newly introduced MitraClip device has demonstrated promising acute results in treating this patient cohort. Also noteworthy is the fact that patients who otherwise would have been denied surgery are increasingly referred for treatment with the MitraClip device.

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Background: Surgical mitral valve repair is the gold standard for treatment of mitral regurgitation. Recently, the transcatheter treatment of mitral regurgitation with the MitraClip device (Abbot Vascular Structural Heart, Menlo Park, CA) has demonstrated promising results in treating patients not amenable for surgical correction of mitral valve regurgitation. Most patients reported in the literature requiring surgical bailout after MitraClip treatment presented with residual or recurrent mitral valve regurgitation.

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Aims: To investigate the prognostic burden of previously diagnosed and treated malignancies in candidates for percutaneous mitral valve repair (MVR) with MitraClip.

Methods And Results: A total of 165 patients underwent MVR and 19 (11.5%) had been previously treated for malignancy and considered healed with life expectancy over 1 year at time of percutaneous MVR.

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Background: Accurate preoperative assessment of the aortic annulus dimension is crucial for successful transcatheter aortic valve implantation (TAVI). In this study we examined the accuracy of a novel method using two-dimensional transesophageal echocardiography (2D-TEE) for measurement of the aortic annulus.

Methods: We evaluated the theoretical impact of the measurement of the annulus diameter and area using the circumcircle of a triangle method on the decision to perform the procedure and choice of the prosthesis size.

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Background: Accurate preoperative assessment of the aortic annulus dimension is crucial for successful transcatheter aortic valve implantation (TAVI). In this study we validated a new method using two-dimensional transesophageal echocardiography (2D-TEE) for measurement of the aortic annulus prior to TAVI.

Methods: We analysed 124 patients who underwent successful TAVI using a self-expandable prosthesis, divided equally into two groups; in the study group we used the cross sectional short axis 2D-TEE for measurement of the aortic annulus and in the control group we used the long axis 2D-TEE.

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The aim of the study is to evaluate the feasibility and safety of a new left atrial appendage (LAA) occluder. Twelve pigs were included. In 2 pigs the implantation process failed due to pericardial tamponade in 1 pig and device embolization in the other pig.

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Objectives: The aim of this analysis is to examine the influence of gender differences on the outcome after transcatheter aortic valve implantation (TAVI) from a multicenter real-world registry in Germany (TAVI registry).

Background: The impact of gender differences on the clinical outcome after TAVI was examined in small studies with conflicting results.

Methods: Consecutive patients (n = 1,432) undergoing TAVI in the period between January 2009 and June 2010 in Germany were evaluated.

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