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Performance of an active inspired hypoxic guard.

Idris E Ghijselings1, Sofie De Cooman2, Rik Carette1

  • 1Department of Anesthesiology, Intensive Care and Pain Therapy, OLV Hospital, Aalst, Belgium.

Journal of Clinical Monitoring and Computing
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Current hypoxic guards fail to maintain adequate oxygen levels. The Maquet O2 Guard® effectively prevents dangerous drops in inspired oxygen concentration (FIO2) during anesthesia, ensuring patient safety.

Keywords:
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Area of Science:

  • Anesthesiology
  • Respiratory Physiology
  • Medical Device Technology

Background:

  • Existing hypoxic guard systems struggle to maintain inspired oxygen concentration (FIO2) ≥ 21% with varying fresh gas flow (FGF) rates when using carrier gases like N2O or air.
  • Hypoxic events during anesthesia pose a significant risk to patient safety.

Purpose of the Study:

  • To evaluate the performance of the Maquet O2 Guard®, an active hypoxic guard designed to increase oxygen delivery when hypoxic mixtures are detected.
  • To assess the O2 Guard's® ability to prevent or mitigate inspired hypoxia in a clinical setting.

Main Methods:

  • The Maquet O2 Guard® was tested in 12 ASA I-II patients undergoing sevoflurane anesthesia with O2/air mixtures.
  • The device was subjected to various delivered hypoxic guard limits (FGF and FDO2) for 4-minute intervals.
  • Key metrics included time to FIO2 drop, time to O2 Guard® activation, and time to FIO2 recovery post-activation. Patients with SpO2 <90% were excluded.

Main Results:

  • One hundred percent incidence of FIO2 <21% was observed within the 1-2 L/min FGF range, highlighting the failure of passive systems.
  • The O2 Guard® activated within 20 seconds of FIO2 reaching 20% in most cases.
  • Inspired oxygen levels were restored to 25% within 55 seconds of O2 Guard® activation, with increased FDO2 and FGF adjustments.

Conclusions:

  • The Maquet O2 Guard® is an effective active inspired hypoxic guard.
  • It rapidly reverses and limits the duration of inspired hypoxic episodes when passive systems fail.
  • This device enhances patient safety by actively managing inspired oxygen levels during anesthesia.