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Wellens' syndrome

Wellens' is an electrocardiographic manifestation of critical left descending (LAD) in people with unstable angina. Originally thought of as two separate types, A and B, it is now considered an evolving wave form, initially of biphasic T wave inversions and later becoming symmetrical, often deep, T wave inversions in the anterior precordial leads.

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Plain-language summary adapted from Wikipedia. Not medical advice.