<unk>  generally refers to continuous or intermittent<unk>  of heart activity, generally by electrocardiography, with assessment of the patient's condition relative to their cardiac rhythm. It is different from hemodynamic<unk> , which monitors the pressure and flow of blood within the cardiovascular system. The two may be performed simultaneously on critical heart patients.<unk>  with a small device worn by an ambulatory patient (one well enough to walk around) is known as ambulatory electrocardiography (such as with a Holter monitor, wireless ambulatory ECG, or an implantable loop recorder). Transmitting data from a monitor to a distant<unk>  station is known as telemetry or biotelemetry.<unk>  in the ED setting has a primary focus on the<unk>  of arrhythmia, myocardial infarction, and QT-interval<unk> . It is a noninvasive diagnostic tool and<unk>  is categorized by the rating system developed by the American College of Cardiology Emergency Cardiac Care Committee. The different classes are as follows: Class I:<unk>  is indicated in all or most patients. Class II:<unk>  may be beneficial, but it is not essential. Class III:<unk>  is not indicated because the patient's serious event risk is low.<unk>  will not have therapeutic benefit.
Cardiac monitoring
Vectorcardiography
Electrocardiography
Cardiac electrophysiology
Cardiotocography
Heart rate monitor
Holter monitor
Electrical cardiometry