Mars M, Maseko S, Thomson S, Rout C
Department of Physiology, University of Natal, Durban.
S Afr J Surg. 1994 Jun;32(2):48-50.
Pulse oximetry has been advocated as a simple noninvasive investigation of vascular compromise. Its usefulness in aiding diagnosis of microvascular compromise in a developing compartment syndrome is questioned. This study investigates the reproducibility of pulse oximetry and the effect on arterial haemoglobin saturation of raising limb intracompartmental pressure by compression bandaging. In 32 out of 50 normal subjects there was a difference in percentage saturation between right and left arms, with a 2% difference in 6 people (12%). Percentage saturation fell significantly at average bandage pressures of 80 mmHg (P < 0.0001) and 60 mmHg (P < 0.001). At clinically relevant pressures, the test had a sensitivity of 40.4%. With a greater than 50% risk of a false-negative result, pulse oximetry is not an appropriate additional investigation in the detection of raised intracompartmental pressure.
脉搏血氧饱和度测定法一直被倡导作为一种简单的无创性检查血管受损情况的方法。然而，其在辅助诊断发展中的骨筋膜室综合征时微血管受损情况的实用性受到质疑。本研究调查了脉搏血氧饱和度测定法的可重复性以及通过加压包扎提高肢体骨筋膜室内压力对动脉血红蛋白饱和度的影响。在50名正常受试者中，有32人双臂之间的饱和度百分比存在差异，其中6人（12%）差异为2%。在平均绷带压力为80 mmHg（P < 0.0001）和60 mmHg（P < 0.001）时，饱和度百分比显著下降。在临床相关压力下，该测试的敏感性为40.4%。由于假阴性结果的风险大于50%，脉搏血氧饱和度测定法在检测骨筋膜室内压力升高时并非合适的额外检查方法。
