使用马氏D系统进行预充氧所需的氧流量比马氏A系统或循环系统更高。

Preoxygenation with the Mapleson D system requires higher oxygen flows than Mapleson A or circle systems.

作者信息

Taha Samar, El-Khatib Mohamad, Siddik-Sayyid Sahar, Dagher Carla, Chehade Jules-Marie, Baraka Anis

机构信息

Department of Anesthesiology, American University of Beirut Medical Center, P.O. Box 11 0236 Beirut, Beirut, Lebanon.

出版信息

Can J Anaesth. 2007 Feb;54(2):141-5. doi: 10.1007/BF03022011.

DOI:10.1007/BF03022011

PMID:17272254

Abstract

PURPOSE

This study investigates the efficacy of preoxygenation with Mapleson A and Mapleson D breathing systems vs the circle system with CO2 absorber.

METHODS

Thirteen healthy volunteers underwent tidal volume breathing for three minutes via facemask using Mapleson A, Mapleson D breathing systems or the circle system with CO2 absorber while breathing 100% O2 at flow rates of 5 L.min-1 and 10 L.min-1. Each volunteer acted as his/her own control by going through each of six preoxygenation protocols in random order. Fractional end-tidal O2 concentration (FETO2) was measured at 30-sec intervals. The results were compared among the three anesthesia systems at the two fresh gas flow rates.

RESULTS

At a fresh gas flow rate of 5 L.min-1, the Mapleson A and circle systems achieved F(ETO2) values of 90.8+/-1.4% and 90.0+/-1.1%, respectively, compared with the lower F(ETO2) (81.5+/-6.3%, P<0.05), achieved with the Mapleson D system. When breathing O2 at 10 L.min-1, the F(ETO2) values after three minutes were similar with the Mapleson A, circle, and Mapleson D breathing systems (91.8+/-2.3%, 91.2+/-1.7%, 90.6+/-2.7%, respectively).

CONCLUSION

When using the Mapleson A and the circle systems for preoxygenation, an oxygen flow rate of 5 L.min-1 can adequately preoxygenate the patient within three minutes, while an oxygen flow of 10 L.min-1 is required to achieve a similar fractional end-tidal O2 concentration with the Mapleson D system.

摘要

目的

本研究调查了使用Mapleson A和Mapleson D呼吸回路预充氧与使用带二氧化碳吸收器的循环回路预充氧的效果。

方法

13名健康志愿者通过面罩，使用Mapleson A、Mapleson D呼吸回路或带二氧化碳吸收器的循环回路，以5 L·min-1和10 L·min-1的流速呼吸100%氧气，进行3分钟的潮气量呼吸。每位志愿者通过随机顺序完成六种预充氧方案中的每一种，作为自身对照。每隔30秒测量呼气末氧分数浓度（FETO2）。比较三种麻醉系统在两种新鲜气体流速下的结果。

结果

在新鲜气体流速为5 L·min-1时，Mapleson A和循环回路的FETO2值分别为90.8±1.4%和90.0±1.1%，而Mapleson D系统的FETO2值较低（81.5±6.3%，P<0.05）。当以10 L·min-1的流速呼吸氧气时，Mapleson A、循环回路和Mapleson D呼吸回路三分钟后的FETO2值相似（分别为91.8±2.3%、91.2±1.7%、90.6±2.7%）。