Summary: High flow through a nasal cannula and CPAP effect in a simulated infant model.
Topic: Pressure – Neonatal
By TA Volsko, K Fedor, J Amadei, & RL Chatburn. Resp Care 2011: 56(12), 1893-1900
Volsko and colleagues used a bench model of the nasopharynx attached to a lung simulator to test the hypothesis that airway pressures generated by HFNC at flows between 2-6Lpm are minimal and clinically unimportant. These authors utilized a lung simulator and attached a capped 22mm adaptor which had holes drilled, using a standardized CPAP sizing template, to simulate the nares of a patient with a closed mouth. The range of expiratory pressures generated by all cannula sizes were 0.04 cmH20 to 1.3 cmH20. The data confirmed that insignificant pressures were generated at these flow rates in a correctly sized cannula, not occluding 50% of the nares.
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