The electrodes only record the electrical activity of the heart. There is no risk of electrical shock during the test because the electrodes used do not produce electricity. Pulmonary atresia with ventricular septal defectĪn electrocardiogram is a safe procedure.Pulmonary atresia with intact ventricular septum.Premature ventricular contractions (PVCs).Orthostatic hypotension (postural hypotension).Ejection fraction: What does it measure?.Electrocardiogram (ECG or EKG) care at Mayo Clinic.Some devices automatically record when an irregular rhythm is detected. You generally push a button when you feel symptoms. You can wear it longer than a Holter monitor, typically 30 days. This portable device is similar to a Holter monitor, but it records only at certain times for a few minutes at a time. A Holter monitor is a small, wearable device that records a continuous ECG, usually for 24 to 48 hours. A health care provider might recommend remote or continuous ECG monitoring. If symptoms tend to come and go, they may not be detected during a standard ECG recording. But if you have a family history of heart disease, your health care provider might suggest an electrocardiogram as a screening test, even if you have no symptoms. The American Heart Association doesn't recommend using electrocardiograms to assess adults at low risk who don't have symptoms.
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