(A) The right precordial leads V1 to V3 in a chest pain patient ultimately diagnosed with AMI. (B) Additional posterior leads V8 and V9 reveal STE, confirming the diagnosis of isolated posterior wall AMI. (A) The right precordial leads V1 to V3 in a chest pain patient ultimately diagnosed with AMI. (B) Additional posterior leads V8 and V9 reveal STE, confirming the diagnosis of isolated posterior wall AMI. T Pollehn et al. Emerg Med J 2002;19:129-135 Copyright © BMJ Publishing Group Ltd and the College of Emergency Medicine. All rights reserved.