Which study should be performed to assess complications related to Kawasaki disease?

Echocardiography is the study that should be performed to assess complications related to Kawasaki disease. This condition primarily affects children and can lead to serious cardiovascular complications, particularly involving the coronary arteries. Kawasaki disease is characterized by inflammation of the blood vessels, and it is essential to monitor the heart for any changes or damage that may occur due to this inflammation.

Echocardiography is a non-invasive imaging technique that allows for real-time visualization of the heart's structure and function. It is particularly useful in evaluating coronary artery involvement, which is a critical complication in Kawasaki disease. By performing an echocardiogram, clinicians can identify any aneurysms or other abnormalities in the coronary arteries, which is vital for timely intervention and management.

In contrast, the other options may not provide the specific information needed to assess complications from Kawasaki disease. Chest X-rays primarily evaluate lung conditions or heart size but will not give detailed information about coronary artery health. Blood cultures are used to detect infections, and while they are important in diagnosing other conditions, they do not assess cardiac complications directly. CT scans may provide useful images for many conditions but are less commonly used in pediatric populations, especially with the advantages that echocardiography offers for cardiac assessment. Thus, echoc