What is the primary function of an implantable cardioverter-defibrillator (ICD)?

An implantable cardioverter-defibrillator (ICD) is primarily designed to monitor and regulate heart rhythm. Its main function is to detect potentially life-threatening arrhythmias, such as ventricular tachycardia or ventricular fibrillation, and deliver appropriate therapies, including antitachycardia pacing and shock delivery, to restore a normal heart rhythm. This critical capability helps prevent sudden cardiac arrest in individuals at high risk of such conditions, highlighting the ICD's vital role in maintaining cardiovascular stability.

While blood pressure regulation, lung function enhancement, and kidney function support are significant health considerations, they fall outside the scope of the ICD's specific purpose. The device’s focus on heart rhythm reflects its essential role in managing electrical abnormalities of the heart, making it a crucial tool in the prevention of severe cardiac events.