one complete heartbeat, consisting of one contraction and relaxation of the heart.
cardiac cycle n.
A complete beat of the heart, including systole and diastole and the intervals between, beginning with any event in the heart’s action to the moment when that same event is repeated.
The rhythmic contraction (systole) and relaxation (diastole) of the chambers of the heart that corresponds to one heartbeat. During the cardiac cycle, blood is pumped out of the heart into the aorta and the pulmonary artery, and blood reenters the heart from the venae cavae and the pulmonary veins. The heart’s valves open and close in response to pressure differences between the chambers.
- Cardiac decompression
cardiac decompression cardiac decompression n. The relief of pressure on the heart caused by blood or fluid in the pericardial sac by means of an incision in the pericardium. Also called pericardial decompression.
- Cardiac dysrhythmia
cardiac dysrhythmia cardiac dysrhythmia n. Any abnormality in the rate, regularity, or sequence of cardiac activation. Also called cardiac arrhythmia.
- Cardiac edema
cardiac edema cardiac edema n. Edema resulting from congestive heart failure.
- Cardiac ganglion
cardiac ganglion cardiac ganglion n. Any of the parasympathetic ganglia of the cardiac plexus between the arch of the aorta and the bifurcation of the pulmonary artery.