Human hypoxic pulmonary vasoconstriction is unaltered by 8 h of preceding isocapnic hyperoxia

Hung-Yuan Cheng, Quentin P P Croft, Matthew C Frise, Nick P Talbot, Nayia Petousi, Peter A Robbins, Keith L Dorrington

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Abstract

Exposure to sustained hypoxia of 8 h duration increases the sensitivity of the pulmonary vasculature to acute hypoxia, but it is not known whether exposure to sustained hyperoxia affects human pulmonary vascular control. We hypothesized that exposure to 8 h of hyperoxia would diminish the hypoxic pulmonary vasoconstriction (HPV) that occurs in response to a brief exposure to hypoxia. Eleven healthy volunteers were studied in a crossover protocol with randomization of order. Each volunteer was exposed to acute isocapnic hypoxia (end-tidal PO2 = 50 mmHg for 10 min) before and after 8 h of hyperoxia (end-tidal PO2 = 420 mmHg) or euoxia (end-tidal PO2 = 100 mmHg). After at least 3 days, each volunteer returned and was exposed to the other condition. Systolic pulmonary artery pressure (an index of HPV) and cardiac output were measured, using Doppler echocardiography. Eight hours of hyperoxia had no effect on HPV or the response of cardiac output to acute hypoxia.

Original languageEnglish
Article numbere13396
Number of pages9
JournalPhysiological Reports
Volume5
Issue number17
Early online date12 Sep 2017
DOIs
Publication statusPublished - Sep 2017

Keywords

  • Cardiac output
  • human
  • hyperoxia
  • pulmonary circulation

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    Cheng, H-Y., Croft, Q. P. P., Frise, M. C., Talbot, N. P., Petousi, N., Robbins, P. A., & Dorrington, K. L. (2017). Human hypoxic pulmonary vasoconstriction is unaltered by 8 h of preceding isocapnic hyperoxia. Physiological Reports, 5(17), [e13396]. https://doi.org/10.14814/phy2.13396