ERA. 1  baseball, baseball game - a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs; he played baseball in high school; there was a baseball game on every empty lot; there was a desire for National League ball in the area; play ball!.
The contraction of the heart muscle starts in the two atria, which push the blood into the ventricles. Then the walls of the ventricles squeeze together and force the blood out into the arteries: the aorta to the body and the pulmonary artery to the lungs.
Myocardial infarction (MI), or heart attack, is an interruption of blood supply to part or all of the heart, causing the muscle cells to die. The most common cause is an occlusion (blockage) of a coronary artery due to rupture of an atherosclerotic plaque (an unstable collection of lipids and white blood cells in the wall of an artery).