An implantable cardioverter-defibrillator ICD or automated implantable cardioverter defibrillator AICD is a device implantable inside the body, able to perform cardioversion , defibrillation , and in modern versions pacing of the heart. The device is therefore capable of correcting most life-threatening cardiac arrhythmias. The ICD is the first-line treatment and prophylactic therapy for patients at risk for sudden cardiac death due to ventricular fibrillation and ventricular tachycardia. Current device batteries last about six to ten years; with advances in technology batteries with more capacity or potentially rechargeable batteries   it may be possible to increase this well past ten years. The lead the electrical cable connecting the device to the heart has a much longer average longevity but can incur various types of malfunction, specifically insulation failure or fracture of the conductor, and require replacement.
Living with an ICD
Implantable Cardioverter Defibrillator (ICD) Systems | Medtronic
Both genetic and environmental factors may play a role in its pathogenesis. It is commonly seen in older individuals and within certain ethnicities. This condition may present unilaterally and bilaterally and is known to be a major risk factor for secondary open angle glaucoma. In contrast to POAG, this disease runs a more aggressive clinical course with high IOP at onset, faster rates of progression, poor response to medical therapy, and increased need for surgical intervention. This brief review will discuss the pathophysiology, clinical course and signs, differential diagnosis, and treatment strategies of this disease. The deposition of this material in the trabecular meshwork can result in aqueous outflow obstruction, raised intraocular pressure IOP and glaucoma.
Artificial cardiac pacemaker
Catheter ablation is a procedure used to remove or terminate a faulty electrical pathway from sections of the hearts of those who are prone to developing cardiac arrhythmias such as atrial fibrillation , atrial flutter and Wolff-Parkinson-White syndrome. If not controlled, such arrhythmias increase the risk of ventricular fibrillation and sudden cardiac arrest. The ablation procedure can be classified by energy source: radiofrequency ablation and cryoablation. Catheter ablation may be recommended for a recurrent or persistent arrhythmia resulting in symptoms or other dysfunction. Typically, catheter ablation is used only when pharmacologic treatment has been ineffective.