consider inferior infarctinferior myocardial infarction arteryinferior posterior infarctacute inferior infarctinferior apical infarctinferior septal infarctacute inferior myocardial infarctioninferior wall infarctioninferior infarct ecgsinus rhythm inferior infarctinferoseptal infarctinferior myocardial infarction ecg