Editing Electrocardiography (section)

===Cardiac monitors===
Besides the standard electrocardiograph machine, there are other devices capable of recording ECG signals. Portable devices have existed since the [[Holter monitor]] was introduced in 1962.
Traditionally, these monitors have used electrodes with patches on the skin to record the ECG, but new devices can stick to the chest as a single patch without need for wires, developed by Zio (Zio XT), TZ Medical (Trident), [[Philips]] (BioTel) and BardyDx (CAM) among many others.
Implantable devices such as the [[artificial cardiac pacemaker]] and [[implantable cardioverter-defibrillator]] are capable of measuring a "far field" signal between the leads in the heart and the implanted battery/generator that resembles an ECG signal (technically, the signal recorded in the heart is called an [[electrogram]], which is interpreted differently).
Advancement of the Holter monitor became the [[implantable loop recorder]] that performs the same function but in an implantable device with batteries that last on the order of years.

Additionally, there are available various [[Arduino]] kits with ECG sensor modules and [[smartwatch]] devices that are capable of recording an ECG signal as well, such as with the 4th generation [[Apple Watch]], [[Samsung Galaxy Watch 4]] and newer devices.