Venous hum

This physically fit boy underwent echocardiography as a neonate because of mother's diabetes and was found to have a healthy heart. Now referred because of a strong murmur. ECG and chest radiograph are normal, auscultation reveals a systolic-diastolic second-degree murmur that is loudest in early diastole. Venous hum is sometimes a misleadingly loud murmur. It is caused by flow in the jugular veins under the clavicle bone ...