Systole
The time during which the ventricular heart muscle contracts to pump blood
Cardiac
Supraventricular Tachycardia [SVT]
A regular rapid heart rate (150-250 beats per minute) that is caused by events triggered in areas above the heart’s lower chambers (the ventricles); see also paroxysmal supraventricular tachycardia (PSVT)
Syncope
A temporary, insufficient blood supply to the brain which causes a loss of consciousness. Usually caused by a serious arrhythmia.