The Aga Khan University Hospital, Pakistan > Health Services > Diagnostic Services > Cardiopulmonary Diagnostic Services > Electrocardiogram (ECG)

Electrocardiogram (ECG)

An electrocardiogram measures and records the changes in your heart’s electrical activity.

Resting Electrocardiogram (ECG)

Resting Electrocardiogram (ECG) is a simple test which is commonly used for basic evaluation of heart status. It records intrinsic electrical activity of the heart to provide useful information regarding previous damage to the heart muscles, enlargement of the heart chambers and abnormalities in the electrical system of the heart. The ECG results are valuable for the diagnosis and initial management of an sudden (acute) heart attack. In the case of an extended monitoring period, more specialized equipment known as an Event Recorder may be used. This mode of monitoring is particularly useful for patients who have very infrequent symptoms.

How to prepare for the test?

Do not apply oily or greasy creams on your skin on the day of your test.

Ambulatory ECG (Holter) Monitoring

In this test, the ECG is continuously monitors the heart status for 24 to 48 hours or more. The signals are captured on a special recorder that is worn by the patient. This prolonged monitoring records transient rhythms or abnormalities. This test is especially useful for patients with palpitations, giddiness or fainting spells. It can also help in assessing responses to drug therapy.

How to prepare for the test?

An advance appointment must be made.
Bring your doctor's prescription to the appointment.
You can eat and drink as usual and should continue to take any prescribed medications.
Wear loose fitting clothing when coming to the hospital and during the monitoring period.
In the Holter hook-up room, surface electrodes will be placed on the upper chest. The electrodes will be connected to the recorder that will be strapped around your waist. You will need to wear it continuously for 24 to 48 hours as requested by your doctor. Please do not remove the electrodes on your own.
You will be asked to keep a diary to record all your activities and any symptoms with the exact time of their occurrence. It is a good idea to synchronize your watch with the timer on the recorder. Please carry out all your activities as usual except for bathing.
You will be advised to return to the hospital at a given time to have the recorder removed for analysis.

Event Loop Recording

The event loop monitors, records and helps in identifying irregularities in the heart rhythm, with the use of electrodes and a device attached to your chest.

How to prepare for the test?

There are no special preparations required for event loop recording.

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