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Table 1 Hemodynamic parameters measured in the ascending aorta at rest and immediately following exercise stress from phase contrast acquisitions. Results are presented as the mean value plus or minus one standard deviation of the samples

From: MRI assessment of aortic flow in patients with pulmonary arterial hypertension in response to exercise

Variable Rest Stress
Young Older PAH Young Older PAH
Heart rate [bpm] 66 ± 11 67 ± 9 69 ± 19 97 ± 19* 87 ± 12* 116 ± 19*
Stroke volume [mL] 96 ± 15 93 ± 16 67 ± 16 116 ± 23* 133 ± 40* 90 ± 42
Cardiac output [L/min] 6.3 ± 1.1 6.3 ± 1.6 4.5 ± 1.4 11 ± 2* 11.8 ± 5* 10.8 ± 5.7*
Peak systolic velocity [cm/s] 77 ± 21 58 ± 15 49 ± 14 78 ± 22 69 ± 27 68 ± 29*
Peak systolic flow [mL/s] 445 ± 85 416 ± 114 309 ± 52 446 ± 118 462 ± 176 388 ± 113
Relative area change 0.28 ± 0.08 0.17 ± 0.05 0.15 ± 0.05 0.28 ± 0.10 0.27 ± 0.14 0.25 ± 0.18
  1. *Denotes statistical significance (p < 0.05) relative to the same cohort at rest