Effects of different concentrations of isoflurane pretreatment on respiratory mechanics, oxygenation and hemodynamics in LPS-induced acute respiratory distress syndrome model of juvenile piglets.

Abstract:

PURPOSE:This study was prospectively designed to investigate the effects of different concentrations of isoflurane (ISO) pretreatment on respiratory mechanics, oxygenation, and hemodynamics in lipopolysaccharide (LPS)-induced acute respiratory distress syndrome (ARDS) model of juvenile piglets. METHODS:Twenty-four piglets (9-14 kg, 5-6 weeks old) were randomly assigned to four groups (n = 6): LPS group, which was injected with LPS (20 μg/kg) to induce ARDS; 0.5 ISO-LPS, 1.0 ISO-LPS, and 1.3 ISO-LPS groups, which were pretreated with 0.5, 1.0, and 1.3 minimum alveolar concentrations (MAC) ISO for 30 min before immediate LPS infusion, respectively. After establishment of ARDS, respiratory mechanism, oxygenation and hemodynamics parameters were measured at baseline, and 0, 1, 2, 3, and 4 hours after induction of ARDS. RESULTS:After induction of ARDS, there were increases in alveolar-arterial oxygen difference (A-aDO2), oxygenation index (OI), mean airway pressure (MAP), dead space-to-tidal volume ratio, heart rate (HR), dP/dtmax, extravascular lung water index, pulmonary vascular permeability index, and PaCO2, and decreases in PaO2/FIO2, respiratory rate (RR), dynamic lung compliance (Cdyn), mean arterial blood pressure (MABP) and systemic vascular resistance (SVR) compared with baseline (P(time) < 0.05). Pretreatment with 1.0 and 1.3 MAC ISO alleviated changes in dP/dtmax and PaCO2 at ARDS 0-2 hours, SVR at 0-3 hours, PaO2/FIO2, RR, and MABP at 1-2 hours, HR at 2-3 hours, A-aDO2 at 3-4 hours, and OI at 4 hours (P(group) < 0.05). CONCLUSION:Pretreatment with 1.0 and 1.3 MAC ISO had protective effects on respiratory mechanics, oxygenation, and hemodynamics in piglets with LPS-induced ARDS.

journal_name

Exp Lung Res

authors

Fu H,Sun M,Miao C

doi

10.3109/01902148.2015.1054530

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

415-21

issue

8

eissn

0190-2148

issn

1521-0499

journal_volume

41

pub_type

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