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Malignant hyperthermia and the clean machine.

T T McGraw1, T P Keon

  • 1Department of Anaesthesia, University of Pennsylvania, Philadelphia.

Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|September 1, 1989
PubMed
Summary
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This study assessed halothane contamination in anesthetic machines after use. Post-anesthesia, a six-minute oxygen flush effectively removed all detectable halothane, ensuring machine and room safety.

Area of Science:

  • Anesthesiology
  • Environmental Health
  • Analytical Chemistry

Background:

  • Halothane is an anesthetic agent with potential environmental and occupational health implications.
  • Monitoring residual anesthetic agents in the operating room environment is crucial for patient and staff safety.

Purpose of the Study:

  • To quantify residual halothane contamination in anesthetic machines after clinical use.
  • To evaluate the efficacy of a standardized oxygen flush protocol in eliminating halothane from anesthetic circuits.

Main Methods:

  • Ten anesthetic machines were sampled using infrared analysis to detect halothane contamination.
  • Baseline halothane levels were measured in the room and at the machine's common gas outlet.
  • Machines were flushed with oxygen at 12 L/min after a 10-minute halothane delivery period, with continuous monitoring until undetectable levels were reached.

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Main Results:

  • Pre-study halothane levels in rooms and machines ranged from 0 to 0.8 parts per million (ppm).
  • Following the oxygen flush protocol, all ten machines showed a decrease in halothane concentration to undetectable levels within six minutes.
  • The oxygen flush was highly effective in clearing residual halothane.

Conclusions:

  • A six-minute oxygen flush at 12 L/min is an effective method for removing residual halothane contamination from anesthetic machines.
  • This protocol significantly reduces potential occupational exposure and ensures a safer operating room environment.
  • Infrared analysis provides a reliable method for quantifying anesthetic agent contamination.