| http://www.w3.org/ns/prov#value | - An ambulance should be called using 999.Symptoms of unstable anginaAngina is a condition in which the blood supplied to heart muscles is restricted due to hardening and narrowing of the arteries connected to the heart and restricting the amount of oxygen.An angina attack usually begins with chest pain that may then affect the left arm, neck, jaw or back.
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