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.
What is Hypertrophic Cardiomyopathy (HCM)? Hypertrophic cardiomyopathy is a thickening (hypertrophy) of the muscles of the wall of the left ventricle of the heart causing the heart to be less able to relax between contractions. In some cases, this can lead to an increase in pressure in the left atrium which then enlarges.