An adult system versus a Bain system: Comparative ability to deliver minute ventilation to an infant lung model with pressure-limited ventilation

G. W. Stevenson*, Michael Tobin, Babette Horn, Edwin H. Chen, Steven C. Hall, Charles J. Coté

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

We compared the efficacy of an adult circle system versus a Bain system to deliver minute ventilation (V(E)) to an infant test lung model using pressure-limited ventilation. To simulate a wide variety of potential infant clinical states, V(E) was measured with two compliances: at peak inspiratory pressures (PIP) of 20, 30, 40, and 50 cm H2O and at respiratory rates (RR) of 20, 30, 40, and 50 breaths/min. Each measurement was made three times, and their average was used for analysis. Data were analyzed using the multiple regression technique. In both normal and low-compliance lung models, V(E) was nearly identical between adult circle and Bain systems (P = 0.67 for normal compliance model, P = 0.89 for low-compliance model). V(E) positively correlated with RR (P < 0.001), PIP (P < 0.001), and lung compliance (P < 0.001). Very high PIP or RR were required to deliver V(E) to the low- compliance lung model. The adult circle system is equivalent to the Bain system in its ability to ventilate an infant test lung over a wide range of RR, PIP, and two compliances during pressure-limited ventilation. V(E) is dependent of PIP, RR, and lung compliance. With low-compliance lungs, both systems require a high PIP. We conclude that both anesthetic systems deliver ventilation over a wide range of respiratory variables during pressure- limited ventilation in infants. Implications: We obtained results from this infant test lung study that indicate that either an adult circle breathing system or the Bain system can reliably deliver ventilation over a wide range of respiratory variables during pressure-limited ventilation in infants.

Original languageEnglish (US)
Pages (from-to)527-530
Number of pages4
JournalAnesthesia and Analgesia
Volume88
Issue number3
StatePublished - Jan 1 1999

ASJC Scopus subject areas

  • Anesthesiology and Pain Medicine

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