Contribution of Corrected QT Dispersion (QTcd) to Dobutamine Stress Echocardiography in Diagnosing Critical Coronary Artery Stenosis [Turk Kardiyol Dern Ars]
Turk Kardiyol Dern Ars. 2000; 28(12): 740-746

Contribution of Corrected QT Dispersion (QTcd) to Dobutamine Stress Echocardiography in Diagnosing Critical Coronary Artery Stenosis

Y.Kürşad ERİNÇ1, Y.Mehmet UZUN1, Oben BAYSAN1, Cem BARÇIN1, Hayrettin KARAEREN1, Celal GENÇ1, Ertan DEMİRTAŞ1

The diagnosis of ischemic heart disease. QT dispersion defined as the difference between the longest and the shorthest QT interval on 12-lead electrocardiogram is a parameter depicting the heterogeneity of the ventricular repolarization. In this study, the contribution of QTcd during DSE to the specificity and sensitivity of the test in diagnosing ischemic heart disease was assessed. Thirty consecutive patients (22 male, 8 female; mean age 54±6 yrs) who were performed coronary angiography were taken into the study. After coronary angiography within one month, DSE was performed. In angiography by using visual methods, 18 patients with 60% stenosis and upper values were accepted as the study group while twelve patients with stenosis below 40% were accepted as the controls. QTcd on 12- lead electrocardiograms both before and just after DSE were measured. In the patient group, QTcd significantly increased from 51±8 msec to 60± 12 msec during dobutamin infusion (p=0.023), while it slightly decreased from 49±6 msec to 48±6 msec in the control group (p=0.471). The sensitivity and specificity of QTcd alone in depicting critical coronary artery stenosis were 56% and 58%; they were found 50% and 92% together with dobutamine stress echocardiography, respectively. In conclusion, measuring QTcd during DSE increases the accuracy of the test. This easily applicable method is thought to be helpful as an adjunct to DSE.

Keywords: Dobutamine stress echocardiography, QT dispersion, critical stenosis

How to cite this article
Y.Kürşad ERİNÇ, Y.Mehmet UZUN, Oben BAYSAN, Cem BARÇIN, Hayrettin KARAEREN, Celal GENÇ, Ertan DEMİRTAŞ. Contribution of Corrected QT Dispersion (QTcd) to Dobutamine Stress Echocardiography in Diagnosing Critical Coronary Artery Stenosis. Turk Kardiyol Dern Ars. 2000; 28(12): 740-746
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