The only way to diagnose a bundle branch block is with an electrocardiogram or EKG. For this test, a technician places ten adhesive pads with electrodes to the chest, arms, and legs. The patient usually lies flat on an exam table or sits straight up in a chair to minimize movement. Electrodes pick up the electrical activity in the heart, and the EKG machine translates it into a tracing, which a qualified medical professional then interprets to diagnose a heart attack, blocked arteries, or structural changes, as well as bundle branch blocks and many other conditions.

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