A heart attack occurs when blood flow to the heart is blocked. If not reopened quickly ... The blow to the chest at precisely the wrong time in the cardiac cycle causes an electrical abnormality in ...

Let's get straight to the heart of the matter—the heart's job is to move blood. Day and night, the muscles of your heart contract and relax to pump blood throughout your body. When blood returns ...

When normal laminar blood flow within the heart is disrupted ... Murmurs are described by their timing in the cardiac cycle, intensity, shape, pitch, location, radiation and response to dynamic ...