Abstract

Venovenous extracorporeal membrane oxygenation (VV ECMO) is now considered a reasonable option to salvage acute respiratory distress syndrome (ARDS). However, we lack a rodent model for experimental studies. This study was undertaken to establish an animal model of VV ECMO in ARDS rats. A total of 18 Sprague-Dawley (SD) rats (350 ± 50 g) were used in this study. Using a rat model of oleic acid (OA)-induced ARDS, VV ECMO was established through cavoatrial cannulation of the right jugular vein for venous drainage and venous reinfusion with a specially designed three-cavity catheter. Continuous arterial pressure monitoring was implemented by using a catheter through cannulation of the right femoral artery. The central temperature was monitored with a rectal probe. Arterial blood gas monitoring was implemented by a blood gas analyzer at three-time points: at baseline, 1-hour (after OA modeling), and 3.5-hour (after VV ECMO support). Lung tissue and bronchoalveolar lavage fluid were harvested respectively for protein concentration and pulmonary histologic evaluation to confirm the alleviation of lung injury during VV ECMO. Following ARDS induced by OA, ten rats were successfully established on VV ECMO without failure and survived the ECMO procedure. VV ECMO alleviated lung injury and restored adequate circulation for the return of lung function and oxygenation. VV ECMO was associated with decreased lung injury score, wet/dry weight ratio, and fluid leakage into airspaces. We have established a reliable, economical, and functioning ARDS rat model of VV ECMO.

Highlights

  • Venovenous extracorporeal membrane oxygenation (VV-Extracorporeal membrane oxygenation (ECMO)) is considered a reasonable option to salvage acute respiratory distress syndrome (ARDS)

  • veno-venous ECMO (VV-ECMO) is thought to play a key role in acute respiratory distress syndrome (ARDS), but its exact role is unclear and suitable animal models are needed to answer this question

  • Ten rats were successfully put on VV-ECMO, with all surviving the ECMO procedure

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Summary

Introduction

Venovenous extracorporeal membrane oxygenation (VV-ECMO) is considered a reasonable option to salvage acute respiratory distress syndrome (ARDS). Extracorporeal membrane oxygenation (ECMO) is a life support technique that provides cardiorespiratory support in patients with severe respiratory and cardiac failure [1]. VV-ECMO is thought to play a key role in acute respiratory distress syndrome (ARDS), but its exact role is unclear and suitable animal models are needed to answer this question. We describe a novel VV-ECMO technique using bi-caval cannulation in an oleic acid (OA)-induced rat model of ARDS. This rat model restores respiratory function and offers a tool to study physiological and molecular changes in lung disease during VV-ECMO

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