title: Hemodynamic characteristics of congenital aortic stenosis: a quantitative stress echocardiography study.
abstract: BACKGROUND
  Several investigators have studied the effects of exercise on pressure gradients and valve area measurements in patients with senile calcific aortic stenosis. However, there are limited data on young patients with congenital aortic stenosis. The current study was conducted to assess the dynamic effect of exercise on aortic valve area and to determine whether pressure gradients or valve area determinations correlate with duration of exercise in these patients.
  
  
  RESULTS
  Twenty-five young patients with congenital aortic stenosis and 10 normal control patients performed symptom-limited bicycle exercise stress tests with quantitative 2-dimensional and Doppler analysis. Compared with normal patients, there were no significant differences in the directional changes in blood pressure, left ventricular volumes, and ejection fraction. There was no correlation between either peak instantaneous or mean transaortic pressure gradient and exercise duration. A small but statistically significant correlation was detected between the continuity equation aortic valve area and duration of exercise (r = 0.49, P =.013). Aortic valve area did not change with exercise in the patient cohort (1.5 +/- 0.6 vs 1.5 +/- 0.6; P = not significant).
  
  
  CONCLUSIONS
  Aortic valve area does not change significantly with exercise in asymptomatic patients with congenital aortic stenosis. Consistent with prior studies, there was no correlation between the duration of exercise and the mean resting aortic valve gradient. A modest but statistically significant correlation was detected between exercise duration and aortic valve area. Further studies are required to determine whether aortic valve area measurements would provide useful adjunctive data on which to base recommendations for participation in competitive sports.
authors.affiliation: Cardiology Unit, Fletcher Allen Health Care, and the University of Vermont, Burlington 05401, USA.
authors.forename: R W
authors.initials: RW
authors.lastname: Battle
authors.forename: S
authors.initials: S
authors.lastname: Crumb
authors.forename: M D
authors.initials: MD
authors.lastname: Tischler
mesh_terms: D000293:Adolescent; D000328:Adult; D001024:Aortic Valve Stenosis / Q000151:congenital* / Q000503:physiopathology*; D002648:Child; D015150:Echocardiography, Doppler; D005080:Exercise Test; D005260:Female; D006439:Hemodynamics; D006801:Humans; D008297:Male; D012044:Regression Analysis