Holter ECG Monitoring: Indications & Preparation

Holter ECG Monitoring
When a standard ECG is inconclusive, Holter monitoring records the heart’s electrical activity continuously for 24 hours or longer with a portable recorder. The stored data are analyzed to detect rhythm, arrhythmias, ischemic changes, pauses, and sometimes HRV.

Why it’s used:
Prior clinical review by a GP/cardiologist clarifies indications and, if needed, temporary medication adjustments. Typical goals: document symptomatic/hidden arrhythmias, assess ischemia, and monitor pacemaker function or treatment efficacy.

Preparation:
Morning shower; keep skin clean and dry. Men should shave chest hair. Take regular medicines unless your doctor says otherwise. Wear a fitted undershirt and loose top; bras are recommended for better lead fixation.

Procedure:
A nurse attaches 5–7 disposable electrodes to the chest and connects them to a small recorder worn on a strap/pouch. Do not press buttons unless instructed. You’ll receive an activity diary to log sleep times, exertion (e.g., stair climbing), symptoms, emotions, meals, and medication times.

Restrictions during monitoring:
Avoid metal detector gates; MRI is contraindicated, X-ray is acceptable; ultrasound is fine if it doesn’t disturb electrodes. Normal phone/computer use is allowed. Don’t sleep prone. If an electrode comes off, re-attach it.

After the test:
Return to remove the device; analysis takes time and the report is interpreted by a specialist.
Contraindication: active inflammatory skin disease on the chest. Otherwise, the test is suitable at any age and with most comorbidities.

Author: Flora Yusufova, Cardiologist, SƏHHƏT Clinic