he electrical conduction system of the heart transmits signals generated by the sinoatrial node to cause contraction of the heart muscle. The signal generated in the sinoatrial node travels through the right atrium to the atrioventricular node, along the Bundle of His and through bundle branches to cause contraction of the heart muscle.
Having a pacemaker implanted is a straightforward process. It's generally performed under local anaesthetic, and you'll be awake during the procedure. The signal generator is usually placed under the skin near the collarbone on the left side of the chest.
A blood clot is the most common cause of stroke. Atrial fibrillation increases the risk of stroke because blood may not be properly pumped out of the heart. This may cause it to aggregate and form a clot. The clot can then travel to the brain and block the flow of blood to the brain (at least partially) resulting in a stroke.
Implantable cardioverter defibrillator (ICD) consist of a pulse generator, pacing or sensing electrodes, and defibrillation coils. Its function is similar to a pacemaker. An ICD is a battery-powered device placed under the skin to monitor your heart rate. It includes wires that connect the ICD to your heart. If it detects an abnormal heart rhythm, an electric shock is sent to restore a normal heartbeat.
Image shows placement of defibrillator electrode paddles to perform cardioversion on a patient with cardiac arrhythmia. Cardioversion is a medical procedure that is used to restore a normal heart rhythm in people with certain types of abnormal heartbeats (called arrhythmias). Cardioversion is generally done by sending electric shocks to the heart through electrodes tied to your chest.
Heart arrhythmia, also known as irregular heartbeat or cardiac dysrhythmia, is a group of conditions where the heartbeat is irregular - too slow or too fast. Arrhythmias are classified into various types such as slow heartbeat (called bradycardia) and fast heartbeat (called tachycardia), and irregular heartbeat (called flutter or fibrillation).