Document Detail

Delivering Nasal High Flow Oxygen Therapy at Increasing Gas Flow Rates Generates Higher Airway Pressure.
MedLine Citation:
PMID:  21496369     Owner:  NLM     Status:  Publisher    
BACKGROUND: Nasal high flow (NHF) oxygen therapy is associated with an increased mean nasopharyngeal airway pressure in adults. However, the relationship between flow and pressure is not well defined. This prospective study set out to describe the relationship between flow and pressure associated with NHF delivered by the Optiflow(tm) system (Fisher and Paykel Healthcare Limited, Auckland, New Zealand). METHODS: Patients scheduled for elective cardiac surgery were invited to participate in the study. Measurements were performed with NHF at gas flow rates of 30, 40 and 50 L/min. Measurements were performed with patients' mouth open and mouth closed. Pressures were recorded over one minute of breathing with averages determined by simple averaging. RESULTS: Mean (SD) airway pressures of 1.93 (1.25), 2.58 (1.54), 3.31 (1.05) cmH₂O with mouth closed were generated at 30, 40 and 50 L/min respectively. A positive linear relationship was found between flow and pressure in patients using NHF. CONCLUSION: This study demonstrates that the mean nasopharyngeal pressure generated by NHF increases as flow rate increases.
Rachael L Parke; Michelle L Eccleston; Shay P McGuinness
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-15
Journal Detail:
Title:  Respiratory care     Volume:  -     ISSN:  0020-1324     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-4-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7510357     Medline TA:  Respir Care     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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