Postoperative hyperoxia (60%) worsens hepatic injury in mice.

Abstract:

BACKGROUND:Liver damage by ischemia and reperfusion injury is a risk factor for morbidity and mortality after liver surgery. Postoperative oxygen treatment is routinely applied in the postanesthesia and intensive care unit after liver surgery. The risks of aggravating the injury by increasing inspiratory oxygen from 21 to 60% in the postoperative period were investigated in mice. METHODS:Parameters of liver injury were compared after induction of hepatic ischemia-reperfusion injury, by clamping the left liver lobe for 45 min, and reperfusion for 24 h either under normoxic (21% oxygen) or hyperoxic (60% oxygen) conditions (n=22 per group). The extent of tissue injury and oxidative responses was analyzed in the presence or absence of polymorphonuclear leukocytes, functional Kupffer cells, and the p47phox unit of the nicotinamide adenine dinucleotide phosphate oxidase (n=6 to 11 per group). RESULTS:Compared with postoperative normoxic conditions, hyperoxia increased cell damage (glutamate-pyruvate transaminase: 1,870 [±968 SD] vs. 60% 2,981 [±1,038 SD], 21 vs. 60% oxygen, in U/l as mean±SD; P<0.01), liver weights (341±52 vs. 383±44, 21 vs. 60% oxygen, in mg as mean±SD; P=0.02), damage scores (1.9±0.8 vs. 3.1±1.0, 21 vs. 60% oxygen, score as mean±SD; P=0.02), and reactive oxygen species (15.0±12.0 vs. 30.4±19.2, 21 vs. 60% oxygen, in μmol/l as mean±SD; P<0.05). The aggravation of the tissue damaging effects as a result of hyperoxia was not seen in mice with depletions of polymorphonuclear leukocytes or Kupffer cells, or with nonfunctioning nicotinamide adenine dinucleotide phosphate oxidase. CONCLUSION:Liver injury after ischemia was significantly aggravated by hyperoxia as a consequence of immune cell-mediated oxidative burst. Further studies are needed to elucidate whether routine delivery of high inspirational oxygen concentrations postoperatively should be limited.

journal_name

Anesthesiology

journal_title

Anesthesiology

authors

Zangl Q,Martignoni A,Jackson SH,Ohta A,Klaunberg B,Kaufmann I,Lukashev D,Ward JM,Sitkovsky M,Thiel M,Choukèr A

doi

10.1097/ALN.0000000000000447

subject

Has Abstract

pub_date

2014-12-01 00:00:00

pages

1217-25

issue

6

eissn

0003-3022

issn

1528-1175

journal_volume

121

pub_type

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