Right Versus Left Prong Nasal Cannula Flow Delivery and the Effects of Nasal Cycling on Inspired FIO2in an Adult Anatomic Model
| Autor: | Christopher J Russian, Nicholas R Henry, S Gregory Marshall |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Adult
Models Anatomic Pulmonary and Respiratory Medicine medicine.medical_specialty medicine.medical_treatment Nose Critical Care and Intensive Care Medicine medicine.disease_cause 03 medical and health sciences 0302 clinical medicine 030202 anesthesiology Occlusion otorhinolaryngologic diseases Cannula Humans Medicine Continuous positive airway pressure Lung Continuous Positive Airway Pressure business.industry Respiration Oxygen Inhalation Therapy Nasal cycle Equipment Design General Medicine respiratory system Surgery Oxygen medicine.anatomical_structure Inhalation 030228 respiratory system Anesthesia business Airway Nasal cannula |
| Zdroj: | Respiratory Care. 61:397-404 |
| ISSN: | 1943-3654 0020-1324 |
| Popis: | BACKGROUND: Nasal cycling may present negative consequences for oxygen-dependent patients using a nasal cannula. This study investigates the effects of nasal cycling on the delivered FIO2 via nasal cannula in an anatomic model following a baseline study comparing right and left prong nasal cannula oxygen flow delivery. METHODS: Flow from right and left nasal cannula prongs were measured simultaneously using thermal mass flow meters while delivering 0.5–6-L/min oxygen for 5 nasal cannulas from different manufacturers. An adult mannikin head with an anatomically correct upper airway was connected to a QuickLung Breather test lung. Nasal cannula-delivered FIO2 was recorded using a polarographic oxygen analyzer with naris occlusion simulated by inserting a 5.0 endotracheal tube into the naris and inflating the endotracheal tube cuff. Data were recorded with both nares open, for right naris occluded and left naris patent, and for left naris occluded and right naris patent at 0.5–6 L/min. RESULTS: A paired t test demonstrated statistical differences between right and left nasal cannula prong oxygen flows ( P < .01). Multivariate analysis of variance demonstrated no significant differences in nasal cannula prong flow between nasal cannula manufacturers. Repeated measures analysis of variance demonstrated significant differences for measured inspired FIO2 ( P < .01) when alternating nares were occluded and patent. The Bonferroni post hoc test showed significant differences for measured FIO2 between patent nares and right naris patent-left naris occluded ( P < .01) and between patent nares and left naris patent-right naris occluded ( P < .01). Measured FIO2 decreased by as much as 0.1 when one naris was occluded. CONCLUSIONS: Oxygen delivery by nasal cannula may be inefficient in the presence of the nasal cycle. Delivered nasal cannula oxygen concentrations decreased when bilateral nasal patency changed to unilateral nasal patency. Although statistically different, nasal cannula prong oxygen flow may not be clinically important across the full range of flows. |
| Databáze: | OpenAIRE |
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