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ACS ranges from a heart attack (myocardial infarction) to unstable angina.

Heart attack (myocardial infarction)

If you have a heart attack, a coronary artery or one of its smaller branches is suddenly blocked. The part of the heart muscle supplied by this artery loses its blood (and oxygen) supply. This part of the heart muscle is at risk of dying unless the blockage is quickly undone. (The word infarction means death of some tissue due to a blocked artery which stops blood from getting past.) In addition to being known as a heart attack, a myocardial infarction is sometimes called a coronary thrombosis.

Heart attack (myocardial infarction)

Three types of angina:

Stable angina

Unstable angina

Variant angina

Classic angina

Crescendo angina

Prinzmetal angina

Three types of angina

Unstable angina

Unstable angina occurs when the blood clot causes a reduced blood flow but not a total blockage. This means that the heart muscle supplied by the affected artery does not die (infarct).



Understanding the heart and coronary arteries

The heart is made mainly of special muscle. The heart pumps blood into blood vessels (arteries) which take the blood to every part of the body.
The coronary arteries supply oxygen-rich blood to the heart If these arteries are narrowed or blocked, the heart does not get enough oxygen.

This can cause angina or a heart attack. The blockage can be sudden and complete, or it can come and go – clot, break open, then clot again. “In either case, the heart tissue is dying, even if it’s just a few cells or a whole big section of the heart,” Bolger said.

Like any other muscle, the heart muscle needs a good blood supply. The coronary arteries take blood to the heart muscle. The main coronary arteries branch off from the aorta. The aorta is the large artery which takes oxygen-rich blood from the heart chambers to the body. The main coronary arteries divide into smaller branches which take blood to all parts of the heart muscle.

Understanding the heart and coronary arteries


Emirates Cardiac Society

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Emirates Cardiac Society (ECS) is a non-profit organization comprising of cardiologists within the UAE that work under the umbrella of the Emirates Medical Association.


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