Inspiratory tidal volume sparing effects of tracheal gas insufflation in dogs with oleic acid-induced lung injury

Avi Nahum, Sue A. Ravenscraft, Alexander B. Adams, John J Marini

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Purpose: Tracheal gas insufflation (TGI) improves the efficiency of conventional mechanical ventilation (CMV) by reducing the series dead space of the airways. Consequently, application of TO as an adjunct to CMV may permit reducing tidal volume (Vt) while limiting CO2 retention. We tested the extent to which panexpiratory TGI allows reduction of Vt while maintaining Paco2 constant in an oleic acid-induced lung injury model. Methods: We studied six anesthetized, paralyzed, and mechanically ventilated dogs. Oleic acid injury was induced by injecting 0.09 mL/kg of oleic acid into the right atrium. After stabilization of lung injury the Vt-sparing effect of TO was tested by progressively increasing catheter flow rate (Vc) from 2 to 5, 10, and 15 L/min while decreasing Vt by an amount that maintained Paco2 constant (≈47 mm Hg) with respect to baseline (Vc = 0 L/ min). Results: Tidal volume was decreased from a baseline value of 0.360 ± 0.030 L to 0.238 ± 0.054 L at Vc of 15 L/min. The reduction in Vt was associated with a decrement in peak and end-inspiratory plateau airway opening pressure from 32 ± 3 to 28 ± 6 cm H2O and from 25 ± 2 to 21 ± 3 cm H2O, respectively. Total physiological dead space fraction decreased from a baseline value of 0.60 ± 0.08 to 0.31 ± 0.20 during TGI at 15 L /min. TGI did not affect cardiac output, Pao2, or pulmonary venous admixture. Conclusion: We conclude that TO can be a useful adjunct to CMV during acute lung injury to limit Vt while avoiding CO2 retention.

Original languageEnglish (US)
Pages (from-to)115-121
Number of pages7
JournalJournal of Critical Care
Issue number3
StatePublished - Sep 1995


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