女性が1人法で行うバッグバルブマスク換気による送気量の検討：EC法と頬部保持法の比較

A Study of The Volume of Air Supplied in Bag-valve-mask Ventilation Performed by A Female Using The One-person Technique: A Comparison of The E-C Technique and The Cheek-holding Technique

要旨

　目的：女性が1人法で行うBVM換気において，頬部保持法はEC法と比較してどの程度の1回送気量を確保できるか，頬部保持法による送気量と女性の身体的特徴との関連性があるかを明らかにする．

　方法：A大学女子看護学生57名が，EC法と頬部保持法によるBVM換気を実施した．送気量は成人マネキンの気道部分にスパイロメーターを接続して測定した．基本属性は身長，体重，BMI，両手の握力，両手の寸法等を調査した．

　結果：頬部保持法は1回送気量の平均値548.0±201.5ml，EC法は403.2±223.7mlであり，有意に多かった（p＜.001）．頬部保持法による1回送気量と身体的特徴とは，有意な相関はみられなかった．

　結論：頬部保持法は，EC法よりも1回送気量が多く，至適送気量の範囲内であり，女性の身体的特徴とは有意な関連がみられなかったことから，人工換気において有効なBVM保持方法である可能性が示唆された．

　Objectives: BVM ventilation performed by a female using the one-person technique, we aimed to elucidate whether the volume of air supplied is greater with the cheek-holding technique or the E-C technique, and how the volume of air supplied using the cheek-holding technique relates to the female's physical characteristics.

　Methods: A total of 57 female nursing students of a university performed BVM ventilation using the E-C technique and the cheek-holding technique. The airway portion of the mannequin was connected to a spirometer with which the volume of air supplied was measured. We also assessed height, body weight, body mass index, grip strength in both hands, and size of both hands.

　Results: The mean volume of air supplied per breath was 548.0 ± 201.5 ml for the cheek-holding technique, and 403.2 ± 223.7 ml for the E-C technique. A significantly greater volume of air was supplied per breath with the cheek-holding technique than with the E-C technique (P < .001). There was no significant correlation found between the physical characteristic parameters of participants and the volume of air supplied per breath with the cheek-holding technique.

　Conclusion: The cheek-holding technique resulted in a greater volume of air supplied per breath than with the E-C technique, and the air volume supplied was within the normal optimal range. Furthermore, there was no significant correlation with the female's physical characteristics, which suggested that the cheek-holding method might serve to be an effective method of holding the BVM for one-person artificial ventilation by a female.