title: Spatial quantitative vectorcardiography in aortic stenosis: correlation with hemodynamic findings.
abstract: Thirty-four patients with hemodynamically documented valvar aortic stenosis without congestive heart failure were studied by the corrected Frank lead system vectorcardiography, with special emphasis on the angular characteristics of spatial R max to define the severity of the lesion. Spatial QRS-T angle demonstrated a highly significant correlation with the peak left ventricular systolic pressure (r = 0.72, P less than 0.001) and a significant correlation with peak transvalvar aortic gradient (r = 0.49, P less than 0.01). Furthermore, all patients with a QRS-T angle of more than 90 degrees had significant aortic stenosis (TVG greater than or equal to 50 mm Hg). The peak left ventricular systolic pressure and transvalvar aortic gradient also demonstrated a significant negative correlation with azimuth angle (r = -0.36 and -0.34, respectively; P less than 0.05) and a positive correlation with spatial R max magnitude (r = 0.38 and 0.41, respectively; P less than 0.05). There was no correlation between elevation angle of spatial R max and left ventricle systolic pressure or transvalvar aortic gradient. Our study indicates that spatial quantitative vectorcardiographic angular characteristics, particularly spatial QRS-T angle, may be a useful adjunct to other noninvasive techniques to assess the severity of valvar aortic stenosis.
authors.affiliation: Department of Cardiology, All India Institute of Medical Sciences, New Delhi.
authors.forename: K K
authors.initials: KK
authors.lastname: Talwar
authors.forename: J C
authors.initials: JC
authors.lastname: Mohan
authors.forename: J
authors.initials: J
authors.lastname: Narula
authors.forename: U
authors.initials: U
authors.lastname: Kaul
authors.forename: M L
authors.initials: ML
authors.lastname: Bhatia
mesh_terms: D000293:Adolescent; D000328:Adult; D001021:Aortic Valve / Q000503:physiopathology; D001024:Aortic Valve Stenosis / Q000503:physiopathology*; D002312:Cardiomyopathy, Hypertrophic / Q000503:physiopathology; D002648:Child; D005260:Female; D006439:Hemodynamics; D006801:Humans; D008297:Male; D008875:Middle Aged; D014672:Vectorcardiography / Q000379:methods*