Echocardiography Techniques II Exam 2 Practice

Estimating EF hinges on how the ventricle’s size and shape are measured. Teichholz calculates EF from LV internal dimensions, usually using M‑mode measurements, and applies a geometric formula assuming a relatively symmetric LV. Because it relies on a simplified shape, its accuracy drops when there are regional wall-motion abnormalities—the ventricle isn’t the expected geometry, so the estimate can misstate EF. Simpson’s method, by contrast, uses two-dimensional border tracing to derive end-diastolic and end-systolic volumes from apical views, then computes EF from those volumes. This approach does not assume a single, uniform shape and tends to be more accurate when endocardial borders are well visualized and the image quality is good. So this option correctly notes that Teichholz uses LV internal dimension measurements and is less accurate with regional wall-motion abnormalities, while Simpson uses 2D volumes with border tracing and is generally more accurate, preferred when the image is adequate. The other statements misstate the techniques (for example, Teichholz isn’t 3D volumes or border tracing, Simpson isn’t based on Doppler EF, and neither method relies on invasive measurement).