Abstract | BACKGROUND: During sedation for upper gastrointestinal endoscopy, oxygen delivery via a nasal cannula is often necessary. However, the influences of the oxygen delivery route and breathing pattern on the F(IO2) have not been thoroughly investigated. The aim of this simulation study was to investigate the difference in the F(IO2) with a pharyngeal cannula versus nasal cannula during high- or low-tidal volume (V(T)) ventilation and open- or closed- mouth breathing. METHODS: Six healthy volunteers were asked to breathe using 2 patterns of ventilation (high or low V(T)) via a sealed face mask connected to an endotracheal tube that was retrogradely inserted into the trachea of a mannequin. The mannequin also had a pharyngeal or nasal cannula inserted into the pharynx or attached to the nose, through which oxygen (2 or 5 L/min) was delivered. The mouth of the mannequin was kept open or closed by packing. We measured the F(IO2) of every breath for 1 min at each setting. RESULTS: During low- and high-V(T) ventilation, the F(IO2) was highest at a flow of 5 L/min with a pharyngeal cannula. Oxygen delivery was higher with the pharyngeal cannula compared with the nasal cannula at all settings. Differences in flow did not result in significant differences in the F(IO2) with high- and low-V(T) ventilation. At a flow of 5 L/min via a pharyngeal cannula, open- mouth breathing resulted in a significantly higher F(IO2) compared with closed- mouth breathing. CONCLUSIONS:
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Authors | Natsuhiro Yamamoto, Tetsuya Miyashita, Shunsuke Takaki, Takahisa Goto |
Journal | Respiratory care
(Respir Care)
Vol. 60
Issue 12
Pg. 1804-9
(Dec 2015)
ISSN: 1943-3654 [Electronic] United States |
PMID | 26350233
(Publication Type: Comparative Study, Journal Article)
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Copyright | Copyright © 2015 by Daedalus Enterprises. |
Chemical References |
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Topics |
- Adult
- Catheters
- Healthy Volunteers
- Humans
- Intubation, Intratracheal
(instrumentation)
- Masks
- Middle Aged
- Mouth Breathing
- Nose
- Oxygen
(administration & dosage)
- Oxygen Inhalation Therapy
(instrumentation, methods)
- Pharynx
- Pulmonary Gas Exchange
- Pulmonary Ventilation
- Respiration
- Tidal Volume
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