Left Ventricular Cavity Size Index for Athletes (BSA-adjusted) Calculator

Left Ventricular Cavity Size Index for Athletes (BSA-adjusted): Explanation and Clinical Context The Left Ventricular (LV) Cavity Size Index is calculated by dividing the LV end-diastolic dimension (LVEDD) by body surface area (BSA). This index normalizes cardiac size to body size, allowing better differentiation between physiological enlargement due to athletic training and pathological dilation seen in cardiomyopathies. In well-trained endurance athletes, mild LV cavity dilation is a normal adaptive response to increased preload and cardiac output demand, known as the “athlete’s heart.” Typical LVEDD/BSA values for athletes range from 25–32 mm/m² for men and slightly lower for women.

Values exceeding 36 mm/m² may suggest pathological remodeling, such as dilated cardiomyopathy (DCM), particularly if accompanied by reduced systolic function or abnormal wall thickness ratios. Clinicians should interpret results in the context of sport type (endurance vs strength), sex, and ethnicity. Integration with other echocardiographic indices (e.g., wall thickness, relative wall thickness, LV mass index, diastolic parameters) enhances diagnostic accuracy.

Clinical Interpretation Summary: – <25 mm/m²: Small LV cavity, may reflect concentric remodeling. – 25–32 mm/m²: Normal for trained athletes. – 33–36 mm/m²: Borderline dilation, physiologic if function preserved. – >36 mm/m²: Pathologic enlargement, evaluate for DCM or myocarditis.