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Implantable electrocardiographs designed for recording the variations of the electric potential caused by the electrical activity of the heart muscle only for a pre-established, relatively short period of time (typically less than one hour), and then record again on the same memory erasing the previous information (i.e., loop recording). These recorders are usually leadless devices implanted in the chest that include two or more electrodes on the surface of the recorder; they can detect and record arrhythmia episodes lasting several minutes either automatically and/or after patient activation. The information can be transferred to a patient-operated device that allows the telemetric communication of the stored data to the physician\'s office, usually through standard telephone lines. A programmer-tester device used to set up the recorders at the time of implantation and to save or retrieve the recorder information later is also available. The recorders are mainly used in patients who have syncope or presyncope events and/or cardiac arrhythmia. Implantable loop-recording ECGs are not intended for a real-time assessment of the electrocardiogram or other cardiac conditions.
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