41.   In so doing, Schrier said, the inhibitors may be stopping heart muscles from stretching in a way that makes them vulnerable.

42.   Initially, the doctors said his chest pain had been traced to a narrowed artery that deprived his heart muscle of nourishing blood flow.

43.   Instead, the dead cells form scar tissue that does not flex when the remaining healthy heart muscles pump.

44.   It is no great mystery why a low-fat diet can unclog narrowed arteries, how exercise strengthens heart muscles, or that relaxation lowers blood pressure.

45.   It provides an alternate route for blood flow to the heart muscle.

46.   It is caused by disruption of electrical activity in the heart muscle during the instant before the tissue is fully recharged and ready to contract again.

47.   Kawachi said that his findings differ from those of previous studies, which examined the role of personality and emotion in long-term degeneration of the heart muscle.

48.   Lee suffers from abnormal heart rhythms and cardiomyopathy, a gradual weakening of the heart muscles that began when she was pregnant with her second child.

49.   Longstanding coronary artery disease had led to a condition known as ischemic cardiomyopathy in which heart muscle dies from oxygen starvation.

50.   Myocarditis is an infection of the heart muscle that can occur two to four weeks after having a viral infection, such as a cold.