Normal ECG. A normal ECG is illustrated above. Note that the heart is beating in a regular sinus rhythm between 60 – 100 beats per minute (specifically 82 bpm). All the important intervals on this recording are within normal ranges

A health care provider might use an electrocardiogram to determine or detect: Irregular heart rhythms (arrhythmias) If blocked or narrowed arteries in the heart (coronary artery disease) are causing chest pain or a heart attack. Whether you have had a previous heart attack.

There is no need to restrict food or drink before having an ECG test. Always let your doctor know what medications you are taking before you have an ECG, and if you have any allergies to adhesive tapes that may be used to attach electrodes.

You don’t need to do anything special to prepare for the test. You can eat and drink as normal beforehand. Before the electrodes are attached, you’ll usually need to remove your upper clothing, and your chest may need to be shaved or cleaned.