On-X vs. SJM Bileaflet Mechanical Valve In Mitral Position: Early Postoperative Hemodynamic Function And Clinical Events

Abstract

Valve replacement still remains the mainstay surgical therapeutic option for patients with valvular heart disease. Unfortunately, to date, no prosthetic valve meets the criteria of the ideal valve that mimics a normal native valve, and each of the currently available prosthetic valves has inherent limitations. Both On-X valve and St.Jude valve are bileaflet mechanical valve prosthesis of different designs. The SJM standard bileaflet prosthesis is the “gold standard” against which most other mechanical valves are compared. It is the most frequently implanted mechanical heart valve prosthesis worldwide. It has extremely durable design with excellent hemodynamic function.The On-X valve has multiple design features that is claimed to promote effective hemodynamics. This study aims to compare the early postoperative hemodynamic function and major clinical events in patients receiving SJM valve & On-X valve in mitral position. In this study, sixty patients of mitral valve disease patients who were scheduled for elective MVR at Ain Shams University Hospitals. These patients were randomly assigned into 2 groupes:Group A: 30 patients received On-X bileaflet mechanical valve; Group B: 30 patients received SJM bileaflet mechanical valve. Exclusion criteria were: Patients in congestive heart failure, Preoperative infective endocarditis, coexistent condition with significantmortality, Emergency operation & Redo-operation and patients with associated coronary disease & ischemic mitral insufficiency. Preoperative variables include age, gender, body surface area, NYHA class, Euroscore, risk factors and full echocardiographic data.