In a patient with new onset murmur, which test should be ordered initially?

• A. Echocardiography
• B. Cardiac catheterization
• C. Electrocardiography
• D. Computed tomography

Answer: (A)

When a new heart murmur is detected, the best first test is echocardiography. Ultrasound of the heart with Doppler lets you see the valve anatomy directly and measure the flow across each valve, so you can identify stenosis or regurgitation, assess valve morphology, and evaluate chamber size and overall ventricular function. This gives essential information about the cause and severity of the murmur and guides management. It’s noninvasive and can be done quickly at the bedside, making it the most efficient initial evaluation.

Cardiac catheterization is invasive and used when there’s a need for definitive hemodynamic data or potential intervention, or when coronary disease workup is also indicated. Electrocardiography mainly assesses rhythm and conduction and doesn’t evaluate valve structure or function. Computed tomography offers detailed anatomy in certain contexts but doesn’t provide the dynamic valve assessment needed to evaluate a new murmur initially. If echo results are inconclusive or more detail is needed, transesophageal echo can be employed for better visualization, but it isn’t the first step.