In 13 @entity1 who had @entity955 the ascending aortic pressure-flow relationships were measured by the pressure gradient technique. Both the pressure and flow curves were similar in contour to ones previously obtained by this method. From these recordings, relationships between the phases of systole, the ventricular filling time, and various derived parameters of pressure and flow such as the pulse pressure, @entity64 volume, peak flow, @entity64 work, and peak power were evaluated. For @entity64 volumes greater than 15 cm(3) there was little change in the duration of systole in an individual @entity1 . In each @entity1 both the preejection period and the duration of ejection showed a good correlation with @entity64 volume, peak flow, @entity64 work, and peak power. When data from all @entity1 were examined, the relationship between @entity64 volume and duration of ejection was found to be curvilinear and had an overall correlation of r=0.91. There was marked variation from @entity1 to @entity1 in duration of both the preejection period and systole. Similar correlations between the phases of systole were noted with peak flow, peak power, and @entity64 work. A positive but mediocre correlation was found between the previous RR interval (an index of ventricular filling time) and the subsequent @entity64 volume. The correlation, in six @entity1 , between two previous RR intervals and @entity64 volume was considerably better. The relationship between the pulse pressure and @entity64 volume was reasonably close except in one @entity1 ; however, the group correlation was poor due to differences between individuals.

Pressure-flow studies in XXXX during @entity955 .

@entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity64 :: ('MESH:D020521', 'Disease') :: ['stroke'] @entity955 :: ('MESH:D001281', 'Disease') :: ['atrial fibrillation']
@entity1 :: (9606,Species) :: ['man']
