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Unstable Angina

Unstable Angina

Unstable angina happens when blood flow to the heart is suddenly slowed by narrowed vessels or small blood clots that form in the coronary arteries. Unstable angina is a warning sign that a heart attack may soon occur.

Unstable angina is an emergency.

Unstable angina symptoms are similar to a heart attack. They may include chest pain or pressure that occurs at rest or with less and less exertion. Symptoms may become severe and last longer. And they may not respond to nitroglycerin or rest.

Unstable angina is a change from stable angina—a pattern of predictable chest pain or other symptoms. Stable angina symptoms are relieved by rest or nitroglycerin.

Current as of: March 12, 2014

Author: Healthwise Staff

Medical Review: Rakesh K. Pai, MD, FACC - Cardiology, Electrophysiology & Stephen Fort, MD, MRCP, FRCPC - Interventional Cardiology

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.

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