In a patient with heart failure presenting with combined systolic and diastolic dysfunction, which diagnostic study is most helpful to assess chamber size and function?

• A. Radionuclide scanning
• B. Echocardiogram
• C. Exercise stress testing
• D. Cardiac catheterization

Answer: (B)

The main idea here is that echocardiography is the most complete, noninvasive way to evaluate heart structure and function, especially when both systolic and diastolic dysfunction are present. An echocardiogram uses ultrasound to visualize the chambers in real time, measure left ventricular and chamber sizes, and assess systolic function with the ejection fraction and wall motion. It also evaluates diastolic function through Doppler techniques that analyze filling patterns (such as the E/A ratio, deceleration time) and tissue Doppler velocities, giving insight into ventricular compliance and filling pressures. This combination lets you quantify both systolic performance and diastolic filling, as well as check for valvular disease that could contribute to heart failure.

Radionuclide scanning can estimate ejection fraction and volumes but provides less detail on chamber anatomy and diastolic function, and involves radiation. Exercise stress testing is focused on ischemia and functional capacity rather than structural assessment. Cardiac catheterization yields precise hemodynamic data and coronary anatomy and can show filling pressures, but it is invasive and not the optimal first-line tool for assessing chamber size and overall function in heart failure.