PMID: 15240962Jul 9, 2004Paper

Comparison of exercise QRS amplitude changes in patients with slow coronary flow versus significant coronary stenosis

Japanese Heart Journal
Muhsin TurkmenYelda Basaran

Abstract

Exercise Q, R, and S wave amplitude changes, called the QRS score, have been reported to be a marker of exercise-induced myocardial ischemia. Therefore, in this study, using the exercise QRS score, we sought to determine if slow coronary flow (SCF) phenomenon is associated with the exercise-induced myocardial ischemia. This retrospective study included 23 patients evaluated for suspected coronary artery disease and found to have SCF (group I) and 19 subjects with angiographically-defined significant coronary artery stenosis (group II). All study subjects underwent treadmill exercise testing using the modified Bruce protocol. For each subject the amplitude of the Q, R, and S waves in leads aVF and V5 was measured manually using calipers before and immediately after exercise. The QRS score was calculated by subtracting the Q, R, and S wave differences in leads aVF and V5. There was no difference between the two groups with respect to demographic properties. The peak heart rate achieved, baseline and peak systolic-diastolic blood pressure, exercise duration, and the metabolic equivalent values were similar in both groups. The maximum ST-segment depression ratio was significantly lower in patients with SCF than those of significant...Continue Reading

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Citations

Jul 27, 2005·International Heart Journal·Nurzen SezginOsman Karakaya
Aug 13, 2011·The Tohoku Journal of Experimental Medicine·Osman KarakayaIrfan Barutcu
May 29, 2007·Journal of Electrocardiology·Andrej GapelyukAlexander Schirdewan
Feb 11, 2014·Blood Coagulation & Fibrinolysis : an International Journal in Haemostasis and Thrombosis·Muhsin TürkmenIrfan Barutcu
Feb 28, 2018·Cardiology Research and Practice·Sabri Seyis

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