Which device detects ventricular tachycardia or fibrillation and delivers a shock to restore normal rhythm?

• A. Endocarditis
• B. Mitral Valve Prolapse
• C. Myocardial Infarction
• D. Implantable Cardioverter-Defibrillator

Answer: (D)

An implantable cardioverter-defibrillator detects ventricular tachycardia or ventricular fibrillation and delivers a shock to restore normal rhythm. It continuously monitors the heart’s rhythm, and when a dangerous fast rhythm is identified, it delivers a high-energy shock (and can also provide pacing therapies) to reset the heart to a normal rate. The device is implanted under the skin with leads connected to the heart. The other terms are heart conditions, not a device that detects and treats life‑threatening arrhythmias.