Heart Index – E

A B C D E F H I L M N O P R S T V
ECG

Short for electrocardiogram or electrocardiography. A test which records the electrical activity of the heart. The printout of the heart’s electrical pulses as recorded during the test is referred to as the electrocardiogram.

Echocardiography

A procedure in which sound pulses are emitted into the body and the resultant echoes from the heart recorded and plotted.

Endocardium

The innermost layer of the wall of the heart.

Endothelium

The inner lining of blood vessels.

Epicardium

The outermost layer of the wall of the heart.

Exercise heart rate

The heart rate which one should attain during exercise in order to maximise cardiovascular benefits. It is pegged at 60-80% of a person’s maximum heart rate (defined as 220 minus his age).

Exercise stress test

A test used to determine how well a person’s heart responds to the stress arising naturally from exercise. It usually involves the person running on a treadmill as his heart rate is monitored by an electrocardiography machine.

Exercise tolerance

The amount of physical activity which a person can undertake without developing breathing difficulties or physical discomfort.