An implantable cardioverter-defibrillator (ICD) is a medical device that is placed inside the body. An ICD is threatening abnormal heart rhythms of life (called arrhythmias), including ventricular fibrillation, which causes large muscle chambers (ventricles) of the heart beat in uncompressed or pump blood. When this happens, there is no real beats and there is no enough blood flow to the brain and to other organs, including the heart. As a result, a person with VF becomes unconscious and may die within minutes.
An ICD is in two parts. The pulse generator looks like a small box. It is implanted under the skin below the collarbone. The box contains a rechargeable lithium oxide (lasting between five and nine years) and electrical components that analyze the heart’s electrical activity. Connected to the pulse generator are one or more electrodes, which travel to the heart. When the CDI notice an abnormal heart rhythm, given a brief electrical pulse to the heart heavy, correcting the abnormal rhythm. Many people say that downloading feels like a blow to the chest, although the type of pain varies.
In addition to “defibrillate” the heart back to a normal rhythm, the CDI also generate electrical impulses softer. These pulses can be adjusted or “set the pace” of an artificial beats when the heart develops other types of arrhythmias. For example, the impulses of CDI can help reduce heart rate when a person has ventricular tachycardia, a beat too fast. The CDI can accelerate pulse beats in bradycardia, an abnormally slow heartbeat.
The Commission also keeps records of their actions. This record helps your doctor to control how often have arrhythmias and how dangerous they are. It also lets your doctor see how well the CDI.
ICDs should be monitored periodically. Surgery is not needed. A special radio transmitter can receive information from the CDI. In addition, CDI can be programmed to improve performance. Adjustments are made with a small instrument like a wand placed near the body.
To avoid unexpected power loss, IDUs have incorporated a warning notifying the physician when the battery is low. The signal comes several months before the battery runs out. Can be detected in the doctor during a routine check of the CDI.
The first ICD in 1980 were quite simple. Just trying ventricular fibrillation and had a pulse generator large enough (about the size of a pack of cigarettes). Its implementation required major surgery to open heart, followed by a long hospitalization. The CDI newer pulse generators have about 1 inch (2.5 centimeters) in diameter and weigh less than 1.4 ounces (40 grams). His pulse generators are inserted under the skin through a small incision and electrodes can be passed through the veins without opening the chest surgery. Because of these improvements, the implementation of the CDI is now classified as minor surgery.
During the past two decades, have been implanted in over 200,000 CDI people around the world. During this time, the Commission has repeatedly shown to be life-saving devices. Most clinical studies confirm that people with CDI have a much lower risk of sudden death than comparable people who received other treatments. In people who have an ICD to correct ventricular fibrillation, the success rate is almost 100%.
ICDs are implanted in an operating room of a hospital or a cardiac electrophysiology laboratory.