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Ambulatory 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). The recorder measures and stores information continuously, thus detecting and recording arrhythmia episodes lasting several minutes; the recording period may be increased a few minutes after patient activation. ECG loop-recorders may be used externally or be implanted under the skin; external units can usually provide signal outputs appropriate to send to the physician\'s office using standard telephone lines. The recorders are mainly used in patients who have syncope or presyncope events and/or cardiac arrhythmia. Loop-recording ECGs are not intended for a real-time assessment of the electrocardiogram or other cardiac conditions.
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