Contrast diagnostic: compare Teichholz and Simpson methods for EF estimation and when each is preferred.

• A. Teichholz uses LV internal dimension measurements and is less accurate with regional wall-motion abnormalities; Simpson uses 2D volumes and border tracing, generally more accurate, preferred when image is adequate.
• B. Teichholz uses 3D volumes; Simpson uses M-mode.
• C. Teichholz uses 2D border tracing; Simpson uses ejection fraction from Doppler.
• D. Teichholz uses myocardial strain analysis; Simpson uses invasive measurement.

Answer: (A)