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Gas flow rates through transtracheal ventilation catheters
Jonathan K Marr1, Loren G Yamamoto
1Energency Department, Kapiolani Medical for Women and Children, Department of Pediatrics, University of Hawaii John A. Burns School of Medicine, 1319 Punahou Street, Honolulu, HI 96826, USA.
The American Journal of Emergency Medicine
|July 20, 2004
Summary
Wall oxygen flow (WOF) provides superior gas delivery for transtracheal ventilation compared to self-inflating ventilation bags (SIVB). Catheter size had minimal impact on flow rates, suggesting WOF is the preferred method for efficient transtracheal ventilation.
Area of Science:
- Medical Devices
- Respiratory Therapy
- Critical Care Medicine
Background:
- Transtracheal ventilation (TTV) is a method for providing oxygenation and ventilation.
- Assessing the efficiency of different TTV delivery systems is crucial for clinical practice.
Purpose of the Study:
- To measure and compare gas flow rates delivered via different transtracheal ventilation methods.
- To evaluate the impact of catheter size on gas flow rates during TTV.
Main Methods:
- Gas flow rates were measured using Wall Oxygen Flow (WOF) at 10 and 15 L/min and a Self-Inflating Ventilation Bag (SIVB).
- Flow rates were assessed through 13, 14, and 16-gauge transtracheal catheters with 5 trials each.
- Delivery time for a 500 cc tidal volume was recorded for both WOF and SIVB.
Main Results:
- WOF demonstrated higher mean gas flow rates across all catheter sizes and flow settings compared to SIVB.
- SIVB flow rates were lower and intermittent due to the need for bag re-inflation.
- Catheter gauge (13G, 14G, 16G) did not significantly alter gas flow rates, indicating Poiseuille's law was not a primary factor.
Conclusions:
- Wall oxygen flow is the preferred method for transtracheal ventilation due to its continuous and higher gas delivery.
- Self-inflating ventilation bags can be a viable alternative when WOF devices are unavailable, though less efficient.
- Catheter selection within the tested range has a limited effect on gas flow rates in TTV.