16-Lead ECG Changes with Coronary Angioplasty - Location of ST-T Changes with Balloon Occlusion of Five Arterial Perfusion Beds

Percutaneous transluminal coronary angioplasty PTCA occlusion in 5 individual coronary artery distributions produced significant ST elevation current of injury in 4850 PTCAs in 46 patients. Four patients had PTCA of two separate coronary arteries. Two patients had no significant ischemic ST changes in the 16SL ECG and no chest pain with PTCA. The 6 limb leads were recorded from Mason-Likar locations modified by moving them centrally on the anterior torso the V leads were recorded in standard locations, except VI was moved to V3R 4 extra leads were placed as follows 1 left axilla, 2 left subcostal margin, 3 V8, and 4 mild-back at the level of V4-V8. The left axillary and back leads discriminated diagonal and left circumflex LCX PTCAs from the others and from each other. V6 showed ST elevation in all LCX PTCAs and in only 10 of left anterior descending occlusions. V3R had ST elevation in 82 of right coronary PTCAs. In 4850 96 of PTCA occlusions the ST elevation localized to the torso locations defined in Forward Model Simulations as specific for the arterial perfusion bed involved. These data strongly support the hypothesis that additional resolution and sensitivity to ischemic change is to be expected with a broader array of ECG leads.