
What is the difference between an insertable cardiac monitor (ICM) and a Holter monitor?
Holter monitors record every beat of a person’s heart for 24 to 48 hours. Some Holter monitors may record longer. An ICM, or loop recorder, monitors a person’s heart for up to several years. ICMs record when something unusual is observed. It may also record the heart rhythm when the patient marks a symptom.
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