title: Effects of sevoflurane on hypoxic pulmonary vasoconstriction in anaesthetized piglets.
abstract: In vitro, halogenated agents reduce the pulmonary vasoconstrictor response to alveolar hypoxia in isolated perfused lungs. However, studies in intact animals have been less convincing. The aim of the present study was to assess the effect of sevoflurane on hypoxic pulmonary vasoconstriction (HPV) in anaesthetized piglets using the pressure/cardiac index relationship (P/Q). Ten large white piglets were anaesthetized and mechanically ventilated, alternately in hyperoxia (FIO2 = 0.4) and hypoxia (FIO2 = 0.12). Multipoint plots of pulmonary arterial pressure (PAP) or differences between PAP and left atrial pressure (LAP) against Q were generated by gradual inflation of a balloon introduced into the inferior vena cava. P/Q relationships were established in hyperoxia and hypoxia at baseline, and then with sevoflurane. In hypoxia, pressure gradients (PAP-LAP) increased at every level of Q, thus demonstrating active pulmonary vasoconstriction. Sevoflurane at 1 MAC did not affect these P/Q relationships in hyperoxia or hypoxia as compared with baseline. Sevoflurane at a clinically relevant concentration (1 MAC) has no significant effect on HPV in anaesthetized piglets.
authors: Département d'Anesthésie-Réanimation Adulte, Groupe Hospitalier de La Timone, Marseille, France.
authors: F
authors: F
authors: Kerbaul
authors: M
authors: M
authors: Bellezza
authors: C
authors: C
authors: Guidon
authors: L
authors: L
authors: Roussel
authors: M
authors: M
authors: Imbert
authors: J P
authors: JP
authors: Carpentier
authors: J P
authors: JP
authors: Auffray
mesh_terms: D000769:Anesthesia, Inhalation / Q000009:adverse effects; D018685:Anesthetics, Inhalation / Q000494:pharmacology*; D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D002245:Carbon Dioxide / Q000097:blood; D006859:Hydrogen / Q000097:blood; D006863:Hydrogen-Ion Concentration; D018496:Hyperoxia / Q000503:physiopathology; D000860:Hypoxia / Q000503:physiopathology*; D016018:Least-Squares Analysis; D008738:Methyl Ethers / Q000494:pharmacology*; D011652:Pulmonary Circulation / Q000187:drug effects*; D000077149:Sevoflurane; D013552:Swine; D014661:Vasoconstriction / Q000187:drug effects*
chemical_list: D018685:Anesthetics, Inhalation; D008738:Methyl Ethers; D002245:Carbon Dioxide; D000077149:Sevoflurane; D006859:Hydrogen