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when a pacemaker impulse succeeds in causing the ventricles of the heart to beat or contract.
Cardiac arrest
During cardiac arrest the heart stops completely.
Cardiac Output
Cardiac resynchronization therapy (see above) device with defibrillation back-up. The defibrillator provides protection against life-threatening rhythms, by delivering anti-tachycardia therapy or shocks, as needed.
Cardiac resynchronization therapy - Defibrillator (CRT-D)
Cardiac resynchronization therapy (see above) device that stimulates the left ventricle as well as the right ventricle with an additional lead implanted into the coronary venous system that wraps around the outside of the left ventricle.
Cardiac Rhythm Management (CRM)
Detection and treatment of heart rhythm disorders.
Cardiomyopathy
A disease of the heart muscle. Most heart disease is due to coronary artery disease, high blood pressure, or abnormal heart valves. Less frequently, the heart muscle becomes abnormal without an obvious cause.
Cardioversion
Stopping a cardiac arrhythmia. In patients with an ICD, this term is used to describe the use of a low energy shock (perhaps 1/10th of the maximum strength of the device) to treat ventricular tachycardia.
Congestive heart failure
A condition that involves loss of pumping ability by the heart, generally accompanied by fluid accumulation in body tissues, especially the lungs.
Contractility
Refers to the inherent strength of the myocardium (ability to shorten). The best diagnostic aid to detect a change in contractility is the echocardiogram (cardiac ultrasound examination).