Author/Authors :
Shemirani، Hasan نويسنده Department of Cardiology, Faculty of Medicine, Isfahan University of Medical Sciences (IUMS), Isfahan , , Nayeri-Torshizi، Elham نويسنده Resident, Cardiac Rehabilitation Research Center, Isfahan Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran ,
Abstract :
BACKGROUND: Myocardial infarction (MI) is a cardiac cell death following the imbalance of
supply and demand. Electrocardiography (ECG) is a diagnostic test for MI and can help the
clinicians to estimate the severity and size of infarction, to suggest the artery related to the
infarct and localize the pathology. The aim of this study is to evaluate the diagnostic value of
ECG in posterior MI (PMI) compared with angiographic findings.
METHODS: In a prospective observational study, using simple sampling patients with diagnosis of
PMI (ST elevation in at least two consecutive leads V7, V8, and V9) were enrolled and all standard 12
leads and also V7, V8, V9 and right leads, including V3R and V4R were recorded and angiography
was performed. ECG changes were recorded and compared with angiography findings.
RESULTS: In this study, totally 138 patients were enrolled (mean ± standard deviation age of
65.00 ± 12.97 and 76.8% male). Left circumflex artery (LCX), right coronary artery (RCA) and
left anterior descending artery (LAD) occlusions occurred in 65.9, 50.7, and 29 percent
respectively. Patients with LCX occlusion had a significantly higher frequency of ST elevation in
V5, V6, I and AVL (P ? 0.001). Patients with RCA occlusion had a significantly higher frequency
of ST elevation in V1, V3R, and V4R and also ST depression in V5 and V6 (P ? 0.001).
CONCLUSION: In PMI, there is a relationship between ECG findings and different coronary
artery occlusions. Hence that ECG is a useful tool to predict the LCX or RCA occlusion in PMI.
