It is known as syncope to fainting, these can occur for different reasons. Find them in this specialized article.
A pacemaker is a device that records the electrical activity of the heart and, if it detects the absence of heartbeats, is capable of delivering an electric current. There are several types of 1, 2 and 3 cameras and are known as unicamarales, bicamarales and tricamarales.
The implantable cardioverter defibrillator is placed as a pacemaker under the skin below the collarbone, either the right or left side. Consisting of one to three wires are placed inside the heart.
Arrhythmias usually have palpitations, are divided into tachycardias (when the heart rate is faster than normal) and braquicardias (when the heart rate is slower than it should).