Effect of donor pre-mortem hypoxia and hypotension on graft function and start of warm ischemia in donation after cardiac death lung transplantation

Kentaroh Miyoshi, Takahiro Oto, Shinji Otani, Shin Tanaka, Masaaki Harada, Tomokazu Kakishita, Shiro Hori, Naohisa Waki, Masaomi Yamane, Shinichiro Miyoshi

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Background: The start of warm ischemic time (WIT) of donor lungs in donation after cardiac death (DCD) is not clearly defined. We investigated the effect of donor pre-mortem hypotension and hypoxia to determine which physiologic factor is the determinant of WIT onset in controlled DCD lung transplantation. Methods: Twenty mechanically-ventilated donor pigs were placed in 4 groups (n = 5 each) and exposed to each of the pseudo-agonal conditions for 60 minutes: (1) control group, no intervention and optimum ventilation, followed by cardiac arrest; (2) hypotension (HT) group, controlled cardiac tamponade reducing systolic blood pressure to <50 mm Hg, followed by cardiac arrest; (3) hypoventilation (HV) group, ventilation with room air at 5 breaths/min, followed by cardiac arrest; (4) non-circulation (NC) group, initial cardiac arrest, followed by a 60-minute standoff time. The lung graft was retrieved and the left lung was transplanted to the recipient. Graft function was evaluated for 4 hours after contralateral pulmonary artery ligation. The reperfusion injury was evaluated based on tissue cytokine expression, wet weight-to-dry weight ratio, and histology at the end of the reperfusion period. Results: Impaired post-transplant graft function was seen in the HV group, which had significantly poorer oxygenation during the reperfusion period than the other groups (p < 0.001). The HV group also had higher tissue levels of interleukin-8 (p < 0.05), a higher wet weight-to-dry weight ratio (p < 0.05), and histologic findings of graft tissue injury than the control group. The difference in these parameters among the control, HT, and NC groups was not significant. Conclusions: Only pre-mortem hypoxia provoked by hypoventilation significantly impaired lung graft function in DCD lung transplantation. Ventilatory rather than circulatory deterioration can trigger the onset of warm ischemia.

Original languageEnglish
Pages (from-to)445-451
Number of pages7
JournalJournal of Heart and Lung Transplantation
Volume30
Issue number4
DOIs
Publication statusPublished - Apr 1 2011

Keywords

  • definition
  • donation after cardiac death (DCD)
  • hypotension
  • hypoxia
  • lung transplantation
  • warm ischemic time (WIT)

ASJC Scopus subject areas

  • Surgery
  • Pulmonary and Respiratory Medicine
  • Cardiology and Cardiovascular Medicine
  • Transplantation

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