qt interval and p wave dispersion in slow coronary flow phenomenon

Background:slow coronary flow (scf)phenomenon is an angiographic finding which is defined as slow contrast passage through coronary arteries which may predispose patients to serious cardiac complications such as fatal arrhythmias. p-wave and qt-interval dispersion are electrocardiographic findings which are related to atrial fibrillation and ventricular tachyarrhythmias. in the present study, the relation between scfand presence of p-wave and qt-interval dispersion in electrocardiography has been evaluated.methods:47 patients with normal coronary arteries and scfand 40 patients with normal coronary artery flow without scfwere enrolled in this case control study. standard electrocardiogram (ecg) was analyzed for p-wave and qt-interval dispersion. scfwas identified in normal coronary vessels by use of thrombolysis in myocardial infarction (timi) frame count (tfc) method (tfc > 27). corrected timi frame count (ctfc)of coronary vessels as well as mean ctfc along with qt-interval and p-wave dispersion were compared between 2 groups. the study data were analyzed by spss software and p value less than 0.050 was considered to be significant.results:qt-interval [76.17 (35.23) ms versus 39.25 (19.26) ms] and p-wave [39.74 (17.48) ms versus 19.50 (8.54) ms] dispersion were significantly higher among patients with scfphenomenon (p <0.050). in addition, there was a positive significant linear correlation between tfcand p-wave and qt-dispersion (r = 0.857, r = 0.861, respectively, p <0.050).conclusion:according to the results, increasing tfcamong patients with scfwill result in p wave and qt interval dispersion and therefore this finding can be considered as an indicative marker for cardiac events.