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Related Experiment Video

Updated: Jul 7, 2026

A Model to Simulate Clinically Relevant Hypoxia in Humans

A Model to Simulate Clinically Relevant Hypoxia in Humans

Published on: December 22, 2016

Pre-oxygenation in pregnancy: an investigation using physiological modelling.

S H McClelland¹, D G Bogod, J G Hardman

¹Queen's Medical Centre campus, Nottingham University Hospitals NHS Trust, Derby Road, Nottingham NG7 2UH, UK.

|February 22, 2008

Summary

Pre-oxygenation with 100% oxygen is crucial in obstetrics. Pregnant individuals achieve target oxygen levels faster with tidal breathing, suggesting 2 minutes of this method is optimal for safe anaesthetic induction.

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A Swine Model of Neonatal Asphyxia

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Published on: October 11, 2011

Area of Science:

Anesthesiology
Obstetrics
Physiology

Background:

Hypoxemia during anesthetic induction poses risks to both mother and neonate.
Pre-oxygenation can delay the onset of desaturation.

Purpose of the Study:

To investigate the efficacy of pre-oxygenation in pregnant individuals using computer simulation.
To compare pre-oxygenation techniques (tidal vs. vital capacity breathing) in simulated pregnancy.

Main Methods:

Utilized the Nottingham Physiology Simulator configured for normal pregnant physiology.
Created three pregnant and three non-pregnant subject simulations based on published physiological values.
Assessed pre-oxygenation via tidal and vital capacity breathing of 100% oxygen, measuring time to achieve 95% of maximum end-tidal oxygen (P(E)O2) change.

Main Results:

Tidal breathing pre-oxygenation was faster in simulated pregnancy (median 1 min 37 s) compared to non-pregnant simulations (median 2 min 51 s).
Vital capacity breathing required seven breaths in pregnant subjects versus six in non-pregnant subjects to reach equivalent P(E)O2 levels.
Simulations demonstrated population variation in physiological responses.

Conclusions:

Tidal breathing pre-oxygenation is more rapid in pregnancy.
A recommendation of 2 minutes of tidal breathing for pre-oxygenation in pregnant patients is proposed.
Computer simulation provides a valuable tool for investigating obstetric anesthetic practices.