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ORIGINAL ARTICLE
Year : 2019  |  Volume : 9  |  Issue : 4  |  Page : 198-204

Relation between Fragmented Electrocardiogram and Myocardial Reserve in Patients with Cardiac Syndrome X


1 Department of Cardiology, Faculty of Medicine, Zagazig University, Zagazig, Egypt
2 National Heart Center, Tajoura, Tripoli, Libya

Correspondence Address:
Dr. Islam Elsayed Shehata
Department of Cardiology, Faculty of Medicine, Zagazig University, Zagazig 44519
Egypt
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/JICC.JICC_51_19

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Background: We hypothesized that fragmented QRS (fQRS) is an early marker of myocardial involvement in patients with cardiac syndrome X (CSX) which had updated term “Microvascular angina (MVA)”. Therefore, we aimed to investigate the possible relationship between fQRS and myocardial reserve in patients with MVA. Patients and Methods: A comparative cross-section study was conducted on 89 patients with typical angina symptoms, positive exercise treadmill test, and normal coronary angiography. All patients were subjected to history taking, electrocardiogram, echocardiography, dobutamine stress echocardiography, coronary angiography and measurement of body mass index, blood pressure and serum lipid profile. Results: The prevalence of fQRS in patients with MVA was 61%; there were nonsignificant difference in baseline echocardiography left ventricular mass, dimensions, and ejection fraction (EF%) between patients with and without fQRS; on the other hand, patients with fQRS showed a significant decrease in myocardial reserve at dobutamine stress echocardiography, and significant decrease in values of stroke volume and EF in comparison with patients without fQRS, fQRS was inversely correlated with cardiac output, stroke volume, EF as well as cardiac reserve; furthermore, number of leads with fQRS had a significant positive correlation with degree of reduction in cardiac reserve. Conclusion: In MVA patients, fQRS was correlated with reduced cardiac reserve; it has an important clue for microvascular and cardiac contractile dysfunction in these patients. Further follow-up data should be done on a large scale to show how to follow and treat those patients.


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