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[Safety applications in apnea test]

T Maekawa1, D Sadamitsu, A Tateishi

  • 1Critical Care Medical Center, Yamaguchi University Hospital.

Rinsho Shinkeigaku = Clinical Neurology
|December 1, 1993
PubMed
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The apnea test for brain death determination is feasible. Maintaining oxygenation with positive airway pressure and pulse oximetry ensures a safer test, especially for patients with respiratory failure.

Area of Science:

  • Neurology
  • Critical Care Medicine

Background:

  • The apnea test is crucial for determining brain death.
  • Hypoxemia is a significant complication during the apnea test.

Purpose of the Study:

  • To evaluate different oxygen (O2) delivery methods during the apnea test.
  • To identify strategies for safer apnea testing, particularly in patients with respiratory failure.

Main Methods:

  • Comparison of O2 delivery via tracheal cannula versus ventilator.
  • Monitoring of PaO2 and PaCO2 levels during the test.
  • Assessment of body temperature's effect on achieving target PaCO2.
  • Evaluation of positive airway pressure and pulse oximetry for oxygenation maintenance.

Main Results:

Related Experiment Videos

  • The apnea test can be performed using Japanese criteria, increasing PaCO2 to over 60 mmHg.
  • No significant difference in PaO2 and PaCO2 changes was observed between O2 delivery methods.
  • Lower body temperature prolongs the time to reach the target PaCO2.
  • Positive airway pressure and continuous pulse oximetry significantly improve oxygenation.

Conclusions:

  • The apnea test is a practical method for brain death determination.
  • Preventing hypoxemia is critical to avoid further organ damage.
  • Positive airway pressure and pulse oximetry enhance safety during apnea testing in critically ill patients.