منابع مشابه
Spatial R wave amplitude changes during exercise: relation with left ventricular ischemia and function.
Thirty patients who exhibited increased and 65 patients decreased spatial R wave amplitude during exercise testing were compared for left ventricular function and ischemic variables. Spatial R wave amplitude was derived from the three-dimensional Frank X, Y, Z leads using computerized methods. All patients had stable coronary artery disease and they were classified into two groups: one that att...
متن کاملR wave amplitude during exercise. Relation to left ventricular function and coronary artery disease.
Change in R wave amplitude (mean delta R) was measured sequentially during and after 12 lead maximal treadmill exercise tests in 14 subjects with normal coronary arteries and 62 patients with coronary artery disease. In normal subjects mean delta R decreased maximally one minute after exercise and returned to control levels within three minutes. In contrast, mean delta R increased in patients w...
متن کاملR-wave amplitude changes during exercise in adolescents with left ventricular pressure and volume overload.
To determine the diagnostic value of exerciseinduced R-wave changes in adolescents with congenital heart disease, the responses of 50 adolescents without significant heart disease were compared with those of 72 patients with either a left v~r~ular (LV) pressure or volume overload lesion. Among the pressure overload group, 24 patients had valvular aortic stenosis (AS) and 27 had coarctation of t...
متن کاملIntramyocardial conduction: a major determinant of R-wave amplitude during acute myocardial ischemia.
The relationship of changes in ventricular activation patterns and variations in R-wave amplitude on the surface ECG during the hyperacute phase of myocardial ischemia were studied in nine open-chest dogs. The sum of R-wave amplitude (2RWA) changes in surface ECG leads L2, V5 and Frank orthogonal leads X, Y and Z were correlated with changes in the conduction time along the specialized conducti...
متن کاملAcute changes in pacing threshold and R- or P-wave amplitude during permanent pacemaker implantation.
This study examines the changes in pacing threshold and R- or P-wave amplitude during the first 30 minutes after implantation of tined and screw-in leads. The leads examined were those of 1 manufacturer (Medtronic) and consisted of 3 ventricular pacing leads (model numbers 6957 unipolar screw-in [11 patients], 6961 unipolar tined [12 patients] and 6962 bipolar tined [7 patients]) and 1 atrial l...
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ژورنال
عنوان ژورنال: Heart
سال: 1981
ISSN: 1355-6037
DOI: 10.1136/hrt.46.2.224