How does a loop recorder work

Event recorder

Synonym: event recorder, event recorder

1 definition

A Event recorder or. Loop recorder is an external or implantable medical device that is used in cardiology to clarify cardiac arrhythmias and unclear syncope.

2 background

In contrast to the long-term ECG, an event recorder does not continuously record all electrical cardiac actions over several hours. The ECG is only recorded if the patient notices irregular heart actions or if they correspond to a specific, previously defined and stored pattern (discontinuous recording).

3 forms

3.1 External loop recorder

External loop recorders (ELR) register the ECG currents permanently via skin electrodes, but usually delete the recordings after 30 seconds. Only EKG episodes with pathological changes that have been programmed in beforehand or that are identified by the wearer himself at the touch of a button are saved. An emergency call center can be alerted when certain ECG events occur.

3.2 Implantable loop recorder

Implantable loop recorders (ILR) are inserted into the subcutaneous tissue of the right pectoral region through a small skin incision. They are the size of a USB stick, the latest devices are even smaller. After implantation, they can record EKG events for 2-3 years. The events are registered independently of the patient or on his initiative. In practice, reading is done wirelessly via a corresponding connection device.

3.3 Home Devices

In order to be able to better monitor the cardiac activity of patients with known heart disease, easy-to-use single-channel ECG devices are used for the layperson. These usually send the recorded data to an app and via this in turn to the responsible doctor. The handling details differ between the models, but the meaning and result are mostly identical.