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Table 4 Cardiovascular reserve response of control subjects and both PAH groups

From: Impairment of pulmonary vascular reserve and right ventricular systolic reserve in pulmonary arterial hypertension

 

PAH 1

PAH 2

Control

 

ΔmPAP > 5 (n = 9)

ΔmPAP ≤ 5 (n = 9)

(n = 10)

ΔCO, L/min

1.1 ± 0.3

1.9 ± 0.3

4.2 ± 0.3*§

ΔHR, bpm

30 ± 5.2

28 ± 5.8

41 ± 2.1*§

ΔSV, mL

-4.1 ± 1.3

3.2 ± 2.8

13.2 ± 2.8*§

ΔmPAP, mm Hg

17 ± 3.2

0.8 ± 0.9

2.8 ± 0.3*

ΔpPAP, mm Hg

25 ± 4.8

7.2 ± 3.7

4.0 ± 0.6*

ΔPVR, Wood units

1.2 ± 0.6

-2.4 ± 0.6

-1.0 ± 0.2*§

ΔPC, mL/mm Hg

0.46 ± 0.11

0.3 ± 0.2

-0.7 ± 0.4

ΔTPR, Wood units

0.5 ± 0.48

-3.9 ± 0.7

-1.2 ± 0.12*§

ΔIVUSp, %

2.8 ± 2.2

9.4 ± 6.7

32.5 ± 3.2*§

ΔEM, mm Hg

151 ± 29

30 ± 36

-3 ± 1.2*

ΔmPAP/ΔCO, mm Hg/L/min

19.5 ± 3.9

0.3 ± 1.3

0.7 ± 0.07*

ΔTAPSE, mm

4.4 ± 0.9

0.09 ± 1.1

 

ΔSm, cm s-1

3.4 ± 1.2

1.8 ± 0.8

 

ΔIVA, m s-2

3.2 ± 0.9

4.9 ± 1.4

 
  1. p < 0.05, PAH 1 vs. PAH 2; *p < 0.05, Control vs. PAH 1; §p < 0.05, Control vs. PAH 2.
  2. CO: cardiac output; PC: pulmonary capacitance index; EM: elastic modulus; HR: heart rate; IVA: myocardial isovolumic acceleration; IVUSp: pulmonary arterial pulsatility; mPAP and pPAP: mean and pulse arterial pulmonary pressures; PVR: pulmonary vascular resistance; Sm: myocardial peak systolic velocity; SV: stroke volume; TAPSE: tricuspid annular plane systolic excursion; TPR: total pulmonary resistance. Δ = delta.