The implantable cardioverter defibrillator is sometimes known as a shock box or an automated internal cardiac defibrillator (AICD).

ICD is a cutting-edge device that precisely addresses arrhythmias of ventricular origin, such as ventricular tachycardia and fibrillation. It is now the first line of defense for patients who are at high risk for sudden cardiac death (SCD), and it has consistently improved survival in people who have survived cardiac arrest (SCA), have heart failure, and have severe systolic dysfunction (left ventricular ejection fraction, or LVEF, less than or equal to 35 percent), as well as in people with hypertrophic cardiomyopathy (HCM).

Best Cardiologist Indore says ICD is essentially a pacemaker with the ability to detect abnormally fast cardiac rhythm and deliver an immediate treatment. This treatment may take the form of synchronized or asynchronous shock therapy depending on the recognized rhythm and the pre-programmed rhythm detection algorithm or overdrive pacing known as anti-tachycardia pacing (ATP). One that is paired with cardiac resynchronization therapy (CRT-D), which is effectively a bi-ventricular device with leads in the right atrium (RA), right ventricle (RV), and coronary sinus (CS) lead, is available in addition to the single lead or single chamber device. The CS lead is also known as the LV leads due to its proximity.

The subcutaneous device (S-ICD), which utilizes subcutaneous leads rather than intra-cardiac leads, was given FDA approval in 2012. Wearable defibrillators (WCD) have also recently been made available for short-term use.