Echocardiography Techniques I Exam 1 Practice

Why is LV mass indexed to body surface area?

To simplify calculations. To standardize LV mass for body size and improve cross-person comparisons. To determine LV systolic function. To assess diastolic filling pressures.

Correct Answer:

To standardize LV mass for body size and improve cross-person comparisons.

Explanation:

Standardizing LV mass for body size allows meaningful comparisons between people. LV mass tends to be larger in bigger individuals simply because their hearts scale with overall body size. By indexing LV mass to body surface area, we adjust for that size difference, so a LV mass can be judged as proportionate or disproportionate to the person’s body, revealing true hypertrophy rather than normal variation. This makes cross-person comparisons more accurate and helps identify pathological hypertrophy across different ages, sexes, and body types. The other options don’t capture this normalization purpose, as indexing isn’t primarily about simplifying calculations or assessing systolic function or diastolic pressures.

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