<unk><unk>  electrocardiography <unk>  is a type of<unk>  electrocardiography with recording devices that use<unk>  technology, such as Bluetooth and smartphones, for at-home cardiac monitoring (monitoring of heart rhythms). These devices are generally recommended to people who have been previously diagnosed with arrhythmias and want to have them monitored, or for those who have suspected arrhythmias and need to be monitored over an extended period of time in order to be diagnosed.<unk> s work in a way similar to a regular<unk>  by measuring the electrical potential of the heart through the skin. The data is saved on an application on a smartphone, and then uploaded to a computer through Bluetooth or cloud technologies. The information can also be sent through these technologies or through email to a doctor or cardiac technician.<unk> s are able to provide voice alarm messages when cardiac abnormalities occur, such as bradycardia, and can record this information and provide a screen prompt for the patient to view the data. The devices can also store mass amounts of<unk>  data on the phone, replay the<unk>  readings at a high speed, and have a low-voltage alarm function to not waste the battery life. These characteristics of the devices are seen as benefits in comparison to current<unk> <unk>  monitoring equipment such as the Holter monitor. __TOC__
Wireless ambulatory ECG
Electrical cardiometry
Clinical cardiac electrophysiology
Filtered esophageal left heart electrogram
Impedance cardiography
Vectorcardiography
Holter monitor
Magnetocardiography