Rivers Jon, Brown Jules, Dolphin Kirsty, Squire Yolande
Department of Anaesthetics, Southmead Hospital, Bristol, UK.
J Intensive Care Soc. 2015 Nov;16(4):302-305. doi: 10.1177/1751143715583861. Epub 2015 Apr 29.
Low tidal volume ventilation improves outcomes in acute respiratory distress syndrome. Calculation of this volume requires knowledge of a patient's gender, and height, which may not be available in emergency admissions, and the subsequent application of a nomogram. The objective of this study was to test the accuracy of a calibrated measuring tape that reads in mL of tidal volume when the ulna is measured.
The measuring tape was used to obtain an estimate of a subject's tidal volume from their ulna length, and standing height was then measured (reference method).
A total of 100 healthy volunteers were included. Mean tidal volume was 450 mL for males and 372 mL for females when calculated from the height. Comparing tidal volumes from the tape with those from the reference method, Bland Altman analysis showed a bias of -10 mL (limits of agreement (2SD) -74 mL to 54 mL) for males and a bias of -36 mL (limits of agreement (2SD) -88 mL to 16 mL) for females. Predicted mean tidal volumes were 5.7 mL/kg (95% CI: 5.1-6.3 mL/kg) for males and 5.8 mL/kg (95% CI: 5.3-6.2 mL/kg) for females.
Usage of a calibrated measuring tape produced accurate estimates of tidal volumes required for lung protective ventilation in healthy volunteers.
低潮气量通气可改善急性呼吸窘迫综合征的预后。计算该潮气量需要了解患者的性别和身高，而在急诊入院时可能无法获取这些信息，随后还需应用列线图。本研究的目的是测试一种校准后的卷尺的准确性，该卷尺在测量尺骨时能以毫升为单位读出潮气量。
使用卷尺根据受试者的尺骨长度估算其潮气量，然后测量其身高（参考方法）。
共纳入100名健康志愿者。根据身高计算，男性的平均潮气量为450毫升，女性为372毫升。将卷尺测量的潮气量与参考方法测量的潮气量进行比较，布兰德-奥特曼分析显示，男性的偏差为-10毫升（一致性界限（2标准差）为-74毫升至54毫升），女性的偏差为-36毫升（一致性界限（2标准差）为-88毫升至16毫升）。男性预测的平均潮气量为5.7毫升/千克（95%可信区间：5.1-6.3毫升/千克），女性为5.8毫升/千克（95%可信区间：5.3-6.2毫升/千克）。
使用校准后的卷尺能够准确估算健康志愿者肺保护性通气所需的潮气量。
