Aetna considers external loop recorders experimental and investigational for all other indications because their effectiveness for indications other than the ones listed above has not been established. Aetna considers mobile cardiovascular telemetry MCT e. Aetna considers an implantable loop recorder e. Aetna considers implantable loop recorders experimental and investigational for all other indications because their effectiveness for indications other than the ones listed above has not been established. Note : Depending on clinical presentation, the individual may have had a negative or non-diagnostic electrophysiological study EPS ; however, EPS is no longer considered a prerequisite to insertion of an implantable loop recorder. Requests for cardiac event monitoring that do not meet the above criteria and requests for repeat studies within 1 year of a previous study are subject to medical necessity review.
The electrocardiogram is a noninvasive test that is used to reflect underlying heart conditions. It works by measuring the electrical activity of the heart. Having practiced its use, are you sure you know all there is about how to use it?
It is a graph of voltage versus time of the electrical activity of the heart  using electrodes placed on the skin. These electrodes detect the small electrical changes that are a consequence of cardiac muscle depolarization followed by repolarization during each cardiac cycle heartbeat. Changes in the normal ECG pattern occur in numerous cardiac abnormalities, including cardiac rhythm disturbances such as atrial fibrillation and ventricular tachycardia , inadequate coronary artery blood flow such as myocardial ischemia and myocardial infarction , and electrolyte disturbances such as hypokalemia and hyperkalemia. In a conventional lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall magnitude of the heart's electrical potential is then measured from twelve different angles "leads" and is recorded over a period of time usually ten seconds.