[Determinants of left ventricular function in aortic stenosis. Analysis based on pre and postoperative hemodynamic...

Area of Science:

• Cardiology
• Cardiac Physiology
• Valvular Heart Disease

Context:

• Aortic stenosis (AS) is a significant valvular heart disease.
• Assessing preoperative myocardial function is crucial for surgical outcomes.
• Isovolumic contractile indices provide insights into left ventricular contractility.

Purpose:

• To evaluate preoperative myocardial contractile state in patients with aortic stenosis.
• To compare contractile indices between patients with normal and depressed function.
• To assess the impact of valve replacement on ejection performance and contractility.

Summary:

• Preoperative patients with aortic stenosis were divided into two groups based on isovolumic contractile indices (Vpm, Vmax): normal (Group N, 11 patients) and depressed (Group D, 8 patients).
• Peak systolic circumferential wall stress (afterload) was similar between groups and decreased post-valve replacement.
• Left ventricular ejection fraction significantly improved in Group D (48% to 71%) but remained unchanged in Group N (70% to 75%).

Impact:

• The findings suggest an impaired preoperative myocardial contractile state in a subset of aortic stenosis patients.
• Improved ejection performance in Group D at similar afterload indicates intrinsic myocardial dysfunction.
• This highlights the importance of assessing myocardial contractility beyond ejection fraction in AS management.