Final answer:
An electrocardiogram (ECG or EKG) is the procedure used to record the electrical activity of the heart, utilizing electrodes placed on the body to diagnose cardiac rhythms and functions.
Step-by-step explanation:
The procedure that records patterns of electrical activity in the heart to help diagnose abnormal heart rhythms is known as an electrocardiogram (ECG or EKG). An ECG is crucial for detecting heart function and rhythm abnormalities. It involves placing electrodes on the body to measure the electrical impulses in the heart. By employing a standard electrocardiograph with typically 3, 5, or 12 leads, a detailed picture of heart function is produced. The 12-lead ECG provides the most comprehensive information, using 10 electrodes positioned according to a standardized protocol. For continuous monitoring, a Holter monitor may be used, which is a portable device worn by the patient.