Publications by authors named "Alan H Markowitz"

Objectives: To evaluate the midterm survival, clinical, and hemodynamic outcomes of the On-X mechanical mitral valve, based on the 5-year results of the Prospective Randomized On-X Anticoagulation Clinical Trial (PROACT).

Methods: PROACT Mitral was a multicenter study evaluating 401 patients who underwent mitral valve replacement (MVR) with either Standard or Conform-X On-X mitral valves, comparing low-dose and standard-dose warfarin. Here, we report pre-specified, secondary outcomes of survival, New York Heart Association (NYHA) Functional Classification, and valve hemodynamics as assessed by core-lab-adjudicated echocardiography at 1, 3, and 5 years within the pooled population.

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Objective: To evaluate whether transcatheter or surgical aortic valve replacement (TAVR or SAVR) affects clinical and haemodynamic outcomes in symptomatic patients with moderately-severe aortic stenosis (AS).

Methods: Echocardiographic evidence of severe AS for enrolment in the Evolut Low Risk trial was based on site-reported measurements. For this post hoc analysis, core laboratory measurements identified patients with symptomatic moderately-severe AS (1.

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Article Synopsis
  • The PROACT Mitral trial studied the safety and efficacy of low-dose warfarin (target INR 2.0-2.5) compared to standard-dose warfarin (target INR 2.5-3.5) in patients with an On-X mechanical mitral valve.
  • 401 patients were randomly assigned to either low-dose or standard-dose warfarin after undergoing valve replacement, with a primary focus on events like thromboembolism and bleeding.
  • Results showed that low-dose warfarin did not meet the noninferiority threshold compared to standard-dose, with similar event rates in both groups, indicating low-dose warfarin is not as effective at preventing complications.
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Background: Death in high- and intermediate-risk patients after self-expanding transcatheter (TAVR) and surgical aortic valve replacement (surgery) differed in mechanisms and timing. In both risk groups, 1-year all-cause mortality was lower in TAVR than in surgery patients. The differences in mechanism and timing of death in low-risk patients has not been studied.

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Objective: To compare post-procedural outcomes of trans-catheter valve replacement (TAVR) among safety-net (SNH) and non-safety net hospitals (non-SNH).

Background: SNH treat a large population of un-insured and low income patients; prior studies report worse outcome at these centers. Results of TAVR at these centers is limited.

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Background: It remains uncertain how advances in revascularization techniques, availability of new evidence, and updated guidelines have influenced the annual rates of coronary revascularization in the United States.

Methods: We used the Nationwide Inpatient Sample data from 2005 to 2014 with appropriate weighting to determine national procedural volumes. To present accurately overall percutaneous coronary intervention (PCI) rates, PCI with same-day discharge numbers per year were estimated from the available literature and added to annual PCI procedures performed.

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Objectives: Data on next-day discharge (NDD) after transcatheter aortic valve replacement (TAVR) are limited. This study investigated the feasibility and safety of NDD as a first-line option (the very-early discharge [VED] strategy) compared with the early-discharge (ED) strategy (2-3 days as a first-line option) after TAVR.

Methods: We reviewed 611 consecutive patients who had minimalist TAVR (transfemoral approach under conscious sedation) and no in-hospital mortality; a total of 418 patients underwent ED strategy (since December 2013) and 193 patients underwent VED strategy (as part of a hospital initiative to reduce length of stay, since August 2016).

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Objectives: Urgent transcatheter aortic valve replacement (TAVR) is associated with worse short-term outcomes compared with elective TAVR; however, little is known about long-term outcomes or the safety of the minimalist strategy in this setting. This study investigated the short-term and long-term outcomes of urgent TAVR compared with elective TAVR under a minimalist strategy (transfemoral [TF] approach with conscious sedation and no transesophageal echocardiography guidance).

Methods: After excluding 2 emergent patients requiring immediate procedures, a total of 474 consecutive patients underwent elective TF-TAVR (396 patients; 83.

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Background: Re-admission is an important source of patient dissatisfaction and increased hospital costs. A simple calculator to determine the probability of re-admission may help guide patient dismissal planning.

Methods: Using the national readmissions database (NRD), we identified admissions for isolated primary coronary artery bypass (CABG) and stratified them according to 30-day readmission.

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Objectives: This study reports on the clinical effects of complete vs incompletely revascularized coronary artery disease on transcatheter aortic valve replacement (TAVR).

Background: There is a high prevalence of active coronary artery disease (CAD) in patients undergoing TAVR but preemptive revascularization remains controversial.

Methods: Patients were categorized into three cohorts: complete revascularization (CR), incomplete revascularization of a major epicardial artery (IR Major), and incomplete revascularization of a minor epicardial artery only (IR Minor).

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Background: Limited data exist studying the outcomes of the 2 minimally invasive aortic valve replacement (AVR) strategies-mini-sternotomy (AVR-st) and right anterior thoracotomy (AVR-th). We conducted an indirect meta-analysis to compare the outcomes of these minimally invasive approaches with each other and with conventional AVR (cAVR).

Methods: We Searched Medline, PubMed, Embase, and Web of Science in December 2017 for studies comparing AVR-st, AVR-th, and cAVR.

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Background And Aim: We examined the relationship between serum lactate and hemoglobin levels on renal function and postoperative outcome in low-risk elective coronary artery bypass graft (CABG) patients.

Methods: Intraoperative hemoglobin and lactate levels were measured in elective isolated CABG patients. Patients with renal dysfunction (baseline creatinine>2 mg/dL) were excluded.

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Background: Sutureless aortic valve replacement (SU-AVR) and transcatheter aortic valve implantation (TAVI) are increasingly adopted methods to treat high-risk patients with severe aortic valve stenosis. We conducted a systematic review and meta-analysis to compare the clinical outcomes between these two recent methods to treat aortic valve disease.

Methods: We systematically searched multiple databases (January 2000 to October 2016) to identify original studies comparing clinical outcome between SU-AVR and TAVI.

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Moderate ischemic mitral regurgitation (MR) is often present in patients undergoing coronary artery bypass grafting (CABG). However, the clinical benefit of repairing moderate MR during CABG is unproven. We searched multiple databases to identify original studies comparing isolated CABG versus combined CABG and MR surgery (mitral valve surgery with coronary artery bypass grafting [MVCABG]); survival (either early or midterm) was the primary end point.

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Background: Valve selection in patients with end-stage renal disease (ESRD) is uncertain. We performed a systematic review and meta-analysis to compare clinical outcome in ESRD patients undergoing valve replacement.

Methods: We systematically searched multiple databases (2000-October 2015) to identify original studies comparing adverse events between mechanical and biological valve replacement in ESRD patients.

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Background: Renal dysfunction is a common complication after cardiovascular surgery. Controversial issues have been discussed regarding the role of N-acetyl cysteine in the prevention of postoperative renal dysfunction. The purpose of this meta-analysis is to assess whether N-acetyl cysteine offers any protection against the development of acute renal dysfunction after cardiac surgery.

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Introduction: Levosimendan is implemented in patients with low cardiac output after cardiac surgery. However, the strength of evidence is limited by randomized controlled trials enrolling a small number of patients. Hence we have conducted a systematic review to determine the role of levosimendan in adult cardiac surgery.

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Aims: Postoperative atrial fibrillation (POAF), new-onset AF after open heart surgery (OHS), is thought to be related to pericarditis. Based on AF studies in the canine sterile pericarditis model, we hypothesized that POAF in patients after OHS may be associated with a rapid, regular rhythm in the left atrium (LA), suggestive of an LA driver maintaining AF. The aim of this study was to test the hypothesis that in patients with POAF, atrial electrograms (AEGs) recorded from at least one of the two carefully selected LA sites would manifest a rapid, regular rhythm with AEGs of short cycle length (CL) and constant morphology, but a selected right atrial (RA) site would manifest AEGs with irregular CLs and variable morphology.

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Background: We compared early adverse events and midterm survival between primary coronary artery bypass grafting (pCABG) and CABG in patients with percutaneous intervention (secondary CABG, sCABG) because data on this topic are very limited.

Methods: A systematic review of published literature was done to obtain original studies fulfilling the search criteria. The end points studied were early mortality, stroke, renal failure, myocardial infarction, and the need for an intra-aortic balloon pump.

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Background: Data comparing results of off-pump and conventional operations in octogenarians is very limited. Thus we chose to compare early adverse events between off-pump coronary artery bypass grafting (OPCABG) and on-pump CABG (ONCABG) in patients older than 80 years.

Methods: Systematic review of multiple databases was performed to obtain original studies fulfilling search criteria.

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Introduction: Bilateral internal thoracic artery grafting appears to be the preferred method to achieve durable long-term coronary artery revascularization. However, data reporting the benefit of this technique in the elderly is very conflicting.

Method: We performed a systematic review of available literature (till November 2014) using multiple databases to identify studies comparing clinical events in patients undergoing coronary artery bypass grafting using either a single or double internal thoracic artery in the elderly.

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