Detection and Diagnosis

Mount Sinai Heart uses the most advanced tools to diagnose and treat arrhythmias. Our state-of-the-art Electrocardiography and Electrophysiology Laboratories provide the latest equipment so our doctors can quickly and effectively interpret your results.


An electrocardiogram (ECG) is a snapshot of your heart's electrical activity. It can be used to diagnose arrhythmias, and it can often provide information about other heart conditions as well.

Holter Monitor and Event Monitor

A Holter Monitor or Event Monitor can be worn outside of the doctor's office, allowing your doctor to diagnose arrhythmias that occur infrequently. These machines are worn discreetly under your clothing and record the heart's electrical activity throughout the day. They can be worn while doing normal activities.

Signal-Averaged Electrocardiogram

The Signal-Averaged Electrocardiogram analyzes the electrical details of hundreds of heartbeats, which analyzed together, can help identify heart rhythm irregularities which may not be apparent on a standard electrocardiogram. Mount Sinai Heart physicians have pioneered advances in arrhythmia diagnosis. Electrophysiologist J. Anthony Gomes, MD, Professor of Medicine in Cardiology, developed this test.

Electrophysiology Study

This minimally-invasive catheterization procedure can help to diagnose an arrhythmia and locate the area of the heart which is causing the problem. During the test, catheters/small wires are passed through a blood vessel in the groin up to the heart. The signals from various parts of the heart are analyzed to identify the type of arrhythmia. The abnormal heart rhythm can often be treated during the same procedure.

Other Tests

Your doctor may also recommend other testing to look for the cause of an arrhythmia. An echocardiogram is an ultrasound of the heart which is used to evaluate heart valves and other heart structures. A stress test or coronary angiogram can be used to determine if an area of the heart is not getting enough blood due to a blocked artery. An MRI may be used to further evaluate the muscle of the heart.

Contact Us

Hemsley Center for Electrophysiology
1190 Fifth Avenue, 1 South
New York, NY 10029
Tel: 212-241-7114

Al-Sabah Arrhythmia Institute
1111 Amsterdam Avenue
New York, NY 10029
Tel: 212-523-2400

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