Effect of coronary slow flow on dispersion of P-wave & QT-interval and its relationship with Thrombolysis in Myocardial Infarction frame count

Background: Slow coronary flow (SCF) is defined as late opacification at the epicardial coronary arteries without stenosis, in this study we search the effect of isolated CSF on P-wave and QT-interval dispersion. Patients and methods: Thirty five patients with CSF (group 1), and 30 control subjects (group II) matched in sex and age. Both groups underwent a standard 12-lead surface electrocardiogram. Maximal (P max), minimal P-wave durations (P min), P dispersion (PD), and QT dispersion were measured. All patients underwent selective coronary angiography. Coronary flow rates were documented by Thrombolysis in Myocardial Infarction (TIMI) frame count. Results: CSF patients had more P maximum, P dispersion, C QT duration, QT dispersion, and C QT dispersion. TIMl frame counts of CSF patients were significantly higher than those of the control group for all three coronary vessels (P 0.0001). PD was positively correlated with LAD TIMI frame count (r = 0.42; P: 0.01); LCx TIMI frame count (r = 0.40; P: 0.01); and mean TIMI frame count ( r = 0.44; P: 0.007), while weak correlated with RCA TIMI frame count (r = 0.22; and not statistically significant P: 0.18), C QT dispersion was positively correlated with LAD TIMI frame count (r = 0.54; P: 0.001); LCx TIMI frame count (r = 0.70; P: 0.001); and mean TIMI frame count (r = 0.50; P: 0.002), while weak correlated with RCA TIMI frame count (r = 0.24; and not statistically significant P: 0.15). Conclusion: CSF was found to be associated with prolonged dispersion of P-wave and QT-interval. (C) 2012 Egyptian Society of Cardiology. Production and hosting by Elsevier B.V. All rights reserved.