<prompt> Most common site of myocardial infraction is:Anterior wall of left ventriclePosterior wall of left ventriclePosterior wall of right ventricleInferior wall of left ventricle  <response>: Answer is A Anterior wall of left ventricle The most common site of myocardial infarction is the anterior wall of the left ventricle. The frequency of critical narrowing of aerial trunks and corresponding sites of myocordial lesions are as follows : Left anterior discending LAD 40 to 50 Most common Anterior wall of L.V. near apex br. of LCA Anterior poion of ventricular septum Right coronary aery RCA 30 to 40 InferiorPosterior wall of L.V Post. poion of ventricular septum Inferiorposterior right ventricular free wall in some cases Left circumflex br. of LCA 15 to 20 Lateral wall of left ventricle except the apex. 