A 55-year-old man with a history of mild aortic stenosis presents to his cardiologist for a routine exam. He says he has no cardiac symptoms and is physically active. Physical examination is ...

An aortic stenosis murmur is an unusual sound the heart makes due to a narrowing of the aortic heart valve. The narrowed heart valve restricts blood flow from the heart, which can create a murmur.

The correct diagnosis is a 2:1 left bundle branch block (Figure 2). The rhythm is regular at 100 beats/min when measuring intervals from the beginning of the QRS complexes and not R to R. A P wave ...