Indexed effective orifice area after mechanical aortic valve replacement does not affect left ventricular mass...

Area of Science:

• Cardiology
• Cardiac Surgery
• Biomedical Engineering

Background:

• Left ventricular hypertrophy (LVH) is a common consequence of aortic stenosis.
• Aortic valve replacement (AVR) aims to alleviate pressure overload and promote LVH regression.
• Patient-prosthesis mismatch (PPM) can potentially hinder LVH regression after AVR.

Purpose of the Study:

• To investigate the impact of PPM on left ventricular mass regression in elderly patients (>65 years) after AVR.
• To assess whether PPM influences clinical outcomes in this specific demographic.

Main Methods:

• Retrospective analysis of 88 patients over 65 with pure aortic stenosis undergoing mechanical AVR.
• Calculation of effective orifice area index to assess for PPM.
• Multivariate analysis to determine factors influencing left ventricular mass regression.

Main Results:

• No statistically significant difference in postoperative left ventricular mass index or trans-prosthetic gradients between patients with and without PPM.
• Prevalence of residual LVH was similar (50%) in both groups at follow-up.
• Follow-up time and preoperative LV mass were the only significant predictors of indexed left ventricular mass.

Conclusions:

• PPM does not significantly affect left ventricular mass regression in elderly patients undergoing mechanical AVR for aortic stenosis.
• Modern efficient mechanical prostheses facilitate substantial pressure gradient reduction and LVH regression in older patients with low cardiac output requirements, irrespective of PPM.