Echocardiography Techniques II Exam 2 Practice

Left atrial size, expressed as the left atrial volume index (LAVI), reflects how chronically the left ventricle has been under load from filling pressures. Measuring it and indexing to body size makes the value comparable across individuals. A normal LAVI is about 34 mL/m^2 or less. When the LA enlarges, it signals chronically elevated LV filling pressures, often due to diastolic dysfunction or sustained volume overload. This remodeling isn’t just a passive change; it carries prognostic weight—LA enlargement is associated with worse diastolic function, higher risk of atrial fibrillation, stroke, heart failure hospitalizations, and increased mortality. Therefore, the threshold of ≤34 mL/m^2 defines normal, while enlargement indicates adverse cardiovascular risk. The other statements propose incorrect thresholds or deny the prognostic significance of LA size, which contradicts established clinical evidence.