What is considered the gold standard for evaluating cardiac anatomy and pressures?

• A. ECG
• B. Echocardiography
• C. Cardiac catheterization
• D. Nuclear stress testing

Answer: (C)

Direct measurement of cardiac anatomy and intracardiac pressures is best accomplished with cardiac catheterization. In this procedure, a catheter is threaded into the heart and great vessels, allowing precise recording of pressures in the right atrium, right ventricle, pulmonary artery, and left ventricle, as well as measuring oxygen saturations to assess shunts. It also enables coronary angiography to visualize coronary anatomy. These direct, real-time measurements and imaging make it the definitive method for evaluating both structure and hemodynamics.

ECG records electrical activity, not anatomy or pressures. Echocardiography images structure and estimates pressures noninvasively (e.g., via Doppler), but it doesn’t provide direct intravascular pressure measurements. Nuclear stress testing assesses perfusion and viability, not anatomy or intracardiac pressures.