[Dynamics of QT-Dispersion During Bicycle Exercise Test in Assessment of Functional State and Prognosis in Patients With Ischemic Heart Disease.].
Changes of QT-interval dispersion during bicycle exercise test were registered in 68 patients with ischemic heart disease and stable angina. According to results of 5 year follow-up 3 groups of patients were distinguished - with cardiac events (n=20), with stable clinical course (n=30), and with clinical remission (n=18). Average QT dispersions before exercise were similar in 3 groups. At peak exercise average values of QT dispersion were highest in the group of patients with events. QT dispersion increment </=20 ms was found to be prognostically unfavorable. Sensitivities of QT dispersion increment </=20 ms, ST-segment depression 2.0 mm, and coronary angiographic precursors of cardiac events were 75, 40 and 60%, respectively. Combination of QT dispersion increment </=20 ms with ST-segment depression 2.0 mm increased specificity and positive predictive power up to 93.8 and 66.7%, respectively. Thus registration of QT dispersion during exercise was found to be an effective adjunctive instrument of complex assessment of prognosis in patients with ischemic heart disease and stable angina pectoris.
Pshenichnikov
I
I
Institute for Cardiology of Estonia, Tallinn.
Shipilova
T
T
Laane
P
P
Kaĭk
Iu
Iu
Solodkaia
E
E
D001642:Bicycling; D004562:Electrocardiography; D005080:Exercise Test; D006801:Humans; D017202:Myocardial Ischemia; D011379:Prognosis