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Ambulatory Electrocardiographic (Holter) Monitoring

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© 1990 American College of PhysiciansAmerican College of Physicians


Ann Intern Med. 1990;113(1):77-79. doi:10.7326/0003-4819-113-1-77
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Ambulatory electrocardiographic (ECG) (Holter) monitoring was introduced more than 20 years ago, providing a method for recording a patient's cardiac rhythm for 24 or more hours. Within the past 10 years, technologic advances in equipment have provided the capability for monitoring changes in the ST segment throughout a patient's daily activities [1.0].

Equipment: Recording SystemsMost systems use reel-to-reel tapes or cassettes to record AM or FM analog signals and have calibration and event marker controls and an internal clock. Newer devices convert the signal to a digital format for storage. Intermittent recorders are patient- or time-activated recorders that store

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