Pre-oxygenation in pregnancy: the effect of fresh gas flow rates within a circle breathing system
| Autor: | I. Wrench, M. Feast, E. C. Russell, F. Mohammed |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Adult
Respiratory rate chemistry.chemical_element Oxygen Double-Blind Method Anesthesia Conduction Pregnancy Anesthesia Closed-Circuit Tidal Volume Anesthesia Obstetrical Humans Medicine Tidal volume Cesarean Section business.industry Oxygen Inhalation Therapy Oxygenation Carbon Dioxide medicine.disease Fresh gas flow Anesthesiology and Pain Medicine chemistry Anesthesia Breathing Female Entrainment (chronobiology) business |
| Zdroj: | Anaesthesia. 63:833-836 |
| ISSN: | 1365-2044 0003-2409 |
| DOI: | 10.1111/j.1365-2044.2008.05502.x |
| Popis: | We have investigated the effect of oxygen flow rate on pre-oxygenation in pregnant patients at term using a circle system. Twenty patients presenting for elective Caesarean section maintained tidal volume breathing through a standard circle system for 3 min. Subjects were pre-oxygenated using oxygen flow rates of 5 l.min(-1), 10 l.min(-1) and 15 l.min(-1) presented in random order. The mean (SD) fractional end-tidal oxygen at the end of 3 min was 0.86 (0.07) for 5 l.min(-1), 0.92 (0.05) for 10 l.min(-1)and 0.90 (0.09) for 15 l.min(-1) (p < 0.001). Entrainment of air occurred in 22% of pre-oxygenation sessions. Oxygen flow rates of 10 l.min(-1) or above provide optimal pre-oxygenation using a circle system in term parturients. In our study, entrainment of air occurred in a surprisingly high percentage of cases. |
| Databáze: | OpenAIRE |
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