.... Methods: Patients with an aortic valve area (AVA) <1.3 cm 2 who were judged asymptomatic or equivocal symptomatic underwent CPX and an inert gas rebreathing test. Only those where comprehensive evaluation of CPX results indicated haemodynamic compromise from aortic stenosis were referred for valve...

...Helmut Baumgartner; Horst Kratzer; Guenther Helmreich; Peter Kuehn In 35 patients with aortic stenosis the Doppler-derived values of the aortic valve area (continuity equation) were compared with those determined at cardiac catheterization (Gorlin’s formula). The comparison of three modifications...

... valve flow increased during exercise in all but 2 patients. There was no correlation between change in gradient and change in flow during exercise. Although the mean calculated aortic valve area for the group did not change significantly during exercise, the calculated area was larger during exercise...