What diagnostic test is recommended for an infant with suspected patent ductus arteriosus?

An echocardiogram is the recommended diagnostic test for an infant with suspected patent ductus arteriosus (PDA) because it is a non-invasive imaging technique that provides real-time visualization of the heart's structure and function. This test uses sound waves to create detailed images of the heart, allowing clinicians to assess the presence of PDA, its size, and hemodynamic significance.

Echocardiography is particularly effective for infants due to its safety profile and the absence of radiation, making it ideal for this vulnerable population. It not only confirms the presence of a persistent ductus arteriosus but can also evaluate other potential cardiac anomalies and pulmonary flow.

Other options, such as chest X-ray or CT angiography, may have their roles in cardiovascular assessment, but they do not offer the specific advantages of echocardiography for diagnosing PDA. Chest X-rays can provide some information about the heart size and pulmonary blood flow but are less definitive. Cardiac MRI, while useful in some cardiac assessments, is not typically utilized as a first-line diagnostic tool for PDA in infants due to its complexity and the need for sedation.