Inappropriate left ventricular hypertrophy in minor aortic valve disease: a source of error in clinical assessment

Area of Science:

• Cardiology
• Cardiac Physiology

Background:

• Left ventricular hypertrophy (LVH) is a common response to pressure overload.
• Aortic stenosis (AS) is a primary cause of LVH.
• Discrepancies between clinical assessment and invasive findings in AS warrant investigation.

Purpose of the Study:

• To describe a cohort of patients with minor aortic valve disease and disproportionately severe left ventricular hypertrophy.
• To explore potential explanations for this discrepancy, including non-obstructive hypertrophic cardiomyopathy and abnormal hypertrophic response to minor outflow obstruction.
• To inform clinical assessment and management strategies for patients presenting with apparent severe aortic stenosis.

Main Methods:

• Clinical evaluation, electrocardiography (ECG), and echocardiography were used to assess left ventricular hypertrophy and aortic valve disease.
• Cardiac catheterization was performed to determine the hemodynamic severity of aortic stenosis.
• Retrospective case series analysis.

Main Results:

• Patients exhibited clinical, ECG, and echocardiographic findings suggestive of severe aortic stenosis.
• Cardiac catheterization revealed non-hemodynamically significant aortic stenosis (i.e., mild aortic valve disease).
• The severe left ventricular hypertrophy was disproportionate to the degree of aortic stenosis.

Conclusions:

• The findings suggest that severe left ventricular hypertrophy can occur in the presence of minor aortic valve disease, potentially due to an exaggerated hypertrophic response to minor outflow obstruction.
• This presentation can mimic severe aortic stenosis, necessitating careful diagnostic evaluation.
• Considering this association is crucial for appropriate patient management, as medical therapy may be sufficient and valve replacement potentially unnecessary.