Transient alterations of the QRS complex and ST segment during percutaneous transluminal balloon angioplasty of the left anterior descending coronary artery - Wagner, NB; Sevilla, DC; Krucoff, MW; Lee, KL; Pieper, KS; Kent, KK; Bottner, RK; Selvester, RH; Wagner, GS (Am J Cardiol, 1988)