Diagnosis

If you have a right bundle branch block and you're otherwise healthy, you might not need a full evaluation. If you have a left bundle branch block, you will need a full evaluation.

Tests that can be used to diagnose a bundle branch block or its causes include:

• Electrocardiogram (ECG or EKG). An ECG records the electrical impulses in your heart using wires attached to the skin on your chest and sometimes your limbs. This test can show signs of a bundle branch block, as well as which side is being affected.
• Echocardiogram. This test uses sound waves to provide detailed images of the heart's structure and the thickness of your heart muscle. It can show whether your heart valves are moving normally. Your doctor can use this test to pinpoint a condition that caused the bundle branch block.