Anesthetic Gas Monitoring

  • James H. Philip
Conference paper


The essence of clinical inhalation anesthesia is equilibrating anesthetic tension from the dial setting on the vaporizer to the effect on the patient’s brain1. Between vaporizer and brain, the anesthetic tension equilibration is impeded or enhanced by fresh gas flow to the breathing circuit, alveolar ventilation, cardiac output, perfusion to tissues competing with the target organ, and finally attainment of partial pressure equilibrium between arterial blood and the patient’s brain. The qualitative mental image of anesthetic tension (more properly called partial pressure) traversing successive compartments helps us visualize and comprehend the time course of anesthetization. Predicting the actual anesthetic tensions expected or desired quantifies the mental model and allows us to apply it clinically every day in the OR.


Cardiac Output Anesthetic Agent Alveolar Ventilation Breathing Circuit Anesthetic Depth 
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  1. 1.
    Philip JH. GAS MAN® - Understanding Anesthesia Uptake and Distribution. MED MAN™ Simulations, PO Box 67160, Chestnut Hill MA 02167, USAGoogle Scholar

Copyright information

© Springer-Verlag Tokyo 1992

Authors and Affiliations

  • James H. Philip
    • 1
    • 2
  1. 1.Bioengineering Laboratory, Department of AnesthesiaBrighamUSA
  2. 2.Women’s Hospital and Harvard Medical SchoolBostonUSA

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