Acute Coronary Syndrome

Key facts

• Acute coronary syndrome is an umbrella term for conditions where blood supply to the heart muscle is suddenly blocked or severely reduced, including unstable angina and both types of heart attack (NSTEMI and STEMI).
• It's a medical emergency. Chest pain or pressure, pain radiating to the left arm, jaw, or back, shortness of breath, sweating, and nausea are the classic warning signs, though some people, especially those with diabetes, have milder or atypical symptoms.
• Emergency treatment centres on antiplatelet medicines such as ticagrelor to prevent further clotting, alongside procedures that restore blood flow.
• Long-term management continues with heart and blood pressure medicines, including statins, beta-blockers, and ACE inhibitors, plus lifestyle changes.

What's happening

Acute coronary syndrome covers a spectrum of conditions in which blood flow to part of the heart muscle is suddenly blocked or severely reduced, usually by a blood clot forming over a ruptured fatty plaque inside a coronary artery. It ranges from unstable angina, where blood flow is reduced but the heart muscle isn't yet damaged, to a full heart attack, where part of the muscle begins to die from lack of oxygen.

Warning signs to act on immediately

Classic symptoms include chest pain or pressure, pain that radiates to the left arm, jaw, or back, shortness of breath, sweating, and nausea. Some people, particularly those with diabetes, experience milder or atypical symptoms such as unexplained fatigue or indigestion-like discomfort. Any of these symptoms warrants an emergency call without delay, since minutes matter for how much heart muscle can be saved.

How it's managed

Immediate treatment focuses on restoring blood flow, stopping further clotting, and protecting the heart muscle. Antiplatelet medicines are central to this: ticagrelor is one of the key agents used after a confirmed event to reduce the risk of a further blockage. Long-term management continues with medicines from the heart and blood pressure category, including statins, beta-blockers, and ACE inhibitors, combined with lifestyle changes such as stopping smoking, improving diet, and structured exercise.

When to see a doctor

Any chest pain or pressure lasting more than a few minutes, especially combined with breathlessness, sweating, or pain spreading to the arm or jaw, needs emergency care right away, not a routine appointment.

This page is educational and does not replace advice from a doctor or pharmacist who knows your health history.