A novel large animal model of smoke inhalation-induced acute respiratory distress syndrome

Premila D. Leiphrakpam, Hannah R. Weber, Andrea McCain, Roser Romaguera Matas, Ernesto Martinez Duarte, Keely L. Buesing

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Background: Acute respiratory distress syndrome (ARDS) is multifactorial and can result from sepsis, trauma, or pneumonia, amongst other primary pathologies. It is one of the major causes of death in critically ill patients with a reported mortality rate up to 45%. The present study focuses on the development of a large animal model of smoke inhalation-induced ARDS in an effort to provide the scientific community with a reliable, reproducible large animal model of isolated toxic inhalation injury-induced ARDS. Methods: Animals (n = 21) were exposed to smoke under general anesthesia for 1 to 2 h (median smoke exposure = 0.5 to 1 L of oak wood smoke) after the ultrasound-guided placement of carotid, pulmonary, and femoral artery catheters. Peripheral oxygen saturation (SpO2), vital signs, and ventilator parameters were monitored throughout the procedure. Chest x-ray, carotid, femoral and pulmonary artery blood samples were collected before, during, and after smoke exposure. Animals were euthanized and lung tissue collected for analysis 48 h after smoke inhalation. Results: Animals developed ARDS 48 h after smoke inhalation as reflected by a decrease in SpO2 by approximately 31%, PaO2/FiO2 ratio by approximately 208 (50%), and development of bilateral, diffuse infiltrates on chest x-ray. Study animals also demonstrated a significant increase in IL-6 level, lung tissue injury score and wet/dry ratio, as well as changes in other arterial blood gas (ABG) parameters. Conclusions: This study reports, for the first time, a novel large animal model of isolated smoke inhalation-induced ARDS without confounding variables such as cutaneous burn injury. Use of this unique model may be of benefit in studying the pathophysiology of inhalation injury or for development of novel therapeutics.

Original languageEnglish (US)
Article number198
JournalRespiratory Research
Volume22
Issue number1
DOIs
StatePublished - Dec 2021

Keywords

  • ARDS
  • Hypoxemia
  • Hypoxia
  • Large animal model
  • Smoke inhalation
  • Toxic inhalation injury

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine

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