presystole pre·sys·to·le (prē-sĭs'tə-lē)
The interval in the cardiac rhythm immediately preceding systole.
systole sys·to·le (sĭs'tə-lē)
The rhythmic contraction of the heart, especially of the ventricles, by which blood is driven through the aorta and pulmonary artery after each dilation or diastole. Also called miocardia.
The period during the normal beating of the heart in which the chambers of the heart, especially the ventricles, contract to force blood into the aorta and pulmonary artery. Compare diastole.
systolic adjective (sĭ-stŏl'ĭk)