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The differential effects of systemic vasoconstrictors on human pulmonary artery tension

Hussain, Azar; Bennett, Rob; Haqzad, Yama; Qadri, Syed; Chaudhry, Mubarak; Cowen, Michael; Loubani, Mahmoud; Morice, Alyn


Azar Hussain

Rob Bennett

Yama Haqzad

Syed Qadri

Mubarak Chaudhry

Michael Cowen

Mahmoud Loubani


© The Author 2017. Published by Oxford University Press. All rights reserved. Objectives: Acute pulmonary hypertension following cardiac surgery can have a significant effect on postoperative morbidity and mortality. However, limited data are available on the efficacy and potency of clinically used systemic vasopressors on the pulmonary vasculature. The aim of this study was to use human pulmonary artery to characterize the pharmacological effects of clinically used vasopressors on the human pulmonary vasculature. Methods: Fifty-seven pulmonary artery rings of internal diameter 2-4mm and 2mm long, mounted in a multiwire myograph system, were used to measure changes in isometric tension. We constructed concentration response curves by cumulative addition to the myograph chambers of KCl, noradrenaline (NA), adrenaline (AD), vasopressin, endothelin-1 (ET-1) and prostaglandin F2a (PGF2a). Results: AD, NA, ET-1, PGF2a and KCl caused dose-dependent vasoconstriction in the pulmonary artery samples (EC50 246nM [95% confidence interval, CI, 153-394 nM], 150nM [95% CI 51-447 nM], 1.46nM [95% CI 0.69-3.1 nM], 6.35 μM [95% CI 3.58-11.2 μM] and 17.24mM [95% CI 12.43-24.07 mM], respectively), whereas vasopressin had no significant effect. The order of efficacy was KCl = PGF2a > AD > NA > ET-1 and the order of potency was ET-1 T-AD =NA > PGF2a > KCl. CONCLUSIONS: This study demonstrated the efficacy and potency of clinically used vasopressors and endogenous vasopressors on human pulmonary vascular tone. PGF2a and KCl equally caused maximal amounts of constriction, whereas ET-1 had less effect and vasopressin had no effect. These effects may need to be taken into account in the clinical setting because they might result in the development of pulmonary hypertension.


Hussain, A., Bennett, R., Haqzad, Y., Qadri, S., Chaudhry, M., Cowen, M., Loubani, M., & Morice, A. (2017). The differential effects of systemic vasoconstrictors on human pulmonary artery tension. European Journal of Cardio-Thoracic Surgery, 51(5), 880-886.

Journal Article Type Article
Acceptance Date Nov 17, 2016
Online Publication Date Feb 5, 2017
Publication Date May 1, 2017
Deposit Date May 10, 2022
Journal European Journal of Cardio-thoracic Surgery
Print ISSN 1010-7940
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 51
Issue 5
Pages 880-886
Keywords Pulmonary artery rings; Human; Vasoconstrictor; In vitro; Pulmonary hypertension
Public URL