Posterior STEMI is caused by acute occlusion of the left anterior descending artery. It features signs of coronary occlusion (ST elevation, Q formation) in the posterior leads (V7-9) along with reciprocal changes in the anterior leads. There may also be inferior or lateral infarction.
Posterior infarction is easily missed. Note that the ST elevation need only be >0.5mm in the posterior leads.See also: Basic STEMI localisation
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