Left ventricular function and myocardial mass after aortic valvotomy in infancy

Area of Science:

• Cardiology
• Pediatric Cardiac Surgery
• Echocardiography

Background:

• Aortic valvotomy is a critical procedure for infants with aortic valve stenosis.
• Long-term effects of infant aortic valvotomy on left ventricular (LV) remodeling require further investigation.

Purpose of the Study:

• To assess long-term echocardiographic findings in survivors of aortic valvotomy performed in infancy.
• To evaluate left ventricular (LV) mass, function, and the relationship with residual aortic valve gradients.

Main Methods:

• Cross-sectional echocardiography was performed on 18 survivors of aortic valvotomy (operated at median age 38 days) a mean of 7.5 years post-surgery.
• Left ventricular (LV) end-diastolic volume, LV mass, and LV mass-to-volume index (LVMVI) were calculated and compared to controls.
• Correlation analysis was performed between residual pressure gradient and LVMVI.

Main Results:

• Follow-up revealed a mean gradient of 41 mmHg and normal ejection fraction (0.73).
• Eleven of 18 patients exhibited an abnormally high LV mass-to-volume index (LVMVI) compared to controls.
• A significant correlation (r=0.75, p<0.0004) was found between residual aortic valve gradient and LVMVI.

Conclusions:

• While left ventricular (LV) function is often preserved after infant aortic valvotomy, LV mass can remain elevated.
• Elevated LV mass in these patients may indicate a persistent risk for subendocardial ischemia.
• Some patients require further surgical intervention due to significant residual gradients or aortic regurgitation.