SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Portable heart monitor. Man wearing a portable electrocardiograph hanging on a strap from his neck. The wires lead to 5 electrodes taped to his torso. An electrocardiograph is used to monitor the electrical activity of the heart, allowing the diagnosis of abnormal heart rhythms (arrhythmias). This portable version, called a Holter monitor, records the heart's activity for 24 hours or more, leaving the patient free to continue normal activities. The recording is then analyzed by computer. This technique is useful for diagnosing sporadic heartbeat disturbances that could be missed by a short examination with a fixed monitor.
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