Whiteley M S, Fox A D, Horrocks M
Department of Surgery, Royal United Hospital, Bath.
Ann R Coll Surg Engl. 1998 Mar;80(2):96-8.
Ankle/brachial pressure index (ABPI) using hand-held Doppler and sphygmomanometer is a standard assessment for patients with peripheral arterial occlusive disease (PAOD). Good Doppler technique is difficult to master and so we investigated replacing Doppler with photoplethysmography (PPG). Two investigators examined 52 legs in 32 vascular patients. Both used standard sphygmomanometer cuff occlusion. Restoration of flow was detected by either an 8 MHz Doppler ultrasound probe or a PPG transmitter/receiver on index finger or great toe. Doppler-derived ABPIs were compared with PPG-derived ABPIs. Excellent correlation was found between both indices (correlation coefficient 0.875). Four lower limbs had unrecordable PPG traces, one also having an unrecordable Doppler signal. Excluding these four patients, the correlation coefficient rose to 0.975. PPG placed on the pulp of a digit can replace the hand-held Doppler in measuring ABPIs.
使用手持多普勒仪和血压计测量踝肱压力指数（ABPI）是外周动脉闭塞性疾病（PAOD）患者的标准评估方法。良好的多普勒技术难以掌握，因此我们研究了用光电容积脉搏波描记法（PPG）替代多普勒仪。两名研究人员检查了32例血管疾病患者的52条腿。两人均使用标准血压计袖带进行阻断。通过8兆赫多普勒超声探头或食指或大脚趾上的PPG发射器/接收器检测血流恢复情况。将多普勒衍生的ABPI与PPG衍生的ABPI进行比较。发现两种指数之间具有极佳的相关性（相关系数为0.875）。有四条下肢的PPG波形无法记录，其中一条的多普勒信号也无法记录。排除这四名患者后，相关系数升至0.975。置于手指指腹的PPG可替代手持多普勒仪测量ABPI。
