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Related Experiment Videos

Oxygen flow through nasal cannulae

C L Henderson1, H D Rosen, K L Arney

  • 1Department of Anaesthesia, St. Paul's Hospital, University of British Columbia, Vancouver, Canada.

Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|June 1, 1996
PubMed
Summary
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When distinct oxygen flowmeters are unavailable in operating theatres, connect nasal prongs to the common gas outlet (CGO) or an E-tank flowmeter for accurate oxygen delivery. Avoid the Y-piece connection to prevent under-delivery, especially with an open adjustable pressure release (APL) valve.

Area of Science:

  • Anesthesiology
  • Respiratory Therapy
  • Medical Device Engineering

Background:

  • Many operating theatres lack dedicated oxygen flowmeters.
  • Accurate oxygen delivery via nasal prongs is crucial for patient care.
  • Anesthetic machines have multiple connection points that may affect flow rates.

Purpose of the Study:

  • To measure oxygen flow rates delivered through nasal prongs at various settings and machine attachments.
  • To evaluate the accuracy of oxygen delivery from different connection points on anesthetic machines.
  • To provide guidance on optimal oxygen delivery methods in resource-limited operating theatre settings.

Main Methods:

  • Oxygen flow rates were measured using a calibration analyzer connected to nasal prongs.

Related Experiment Videos

  • Measurements were taken at three, five, and eight L.min-1 via a distinct flowmeter, common gas outlet (CGO), and Y-piece.
  • The adjustable pressure release (APL) valve was tested in closed, open, and partially open states at circuit pressures of 10 and 20 cm H2O.

    • Main Results:

    • The distinct flowmeter and CGO provided the most accurate oxygen delivery (mean differences of 0.2 and 0.4 L.min-1, respectively).
    • Flow rates via the Y-piece were significantly less accurate and lower than set rates, particularly at higher flows (P < 0.0001).
    • With a partially open APL valve, flow was dependent on circuit pressure, not the set flow; no flow occurred with a fully open APL valve.

    Conclusions:

    • For supplemental oxygen delivery without distinct flowmeters, connect nasal prongs to the anesthetic machine's CGO or a portable E-tank flowmeter.
    • Connecting nasal prongs to the Y-piece of a circle system should be avoided due to inaccurate and reduced oxygen delivery.
    • Proper connection of oxygen delivery devices is essential for patient safety and effective respiratory support in anesthesia.