REFLECTANCE PULSE OXIMETRY IN FETAL LAMBS

被引:42
作者
DASSEL, AC
GRAAFF, R
AARNOUDSE, JG
ELSTRODT, JM
HEIDA, P
KOELINK, MH
DEMUL, FF
GREVE, J
机构
[1] UNIV GRONINGEN HOSP,DEPT OBSTET,OOSTERSINGEL 59,9713 EZ GRONINGEN,NETHERLANDS
[2] UNIV GRONINGEN HOSP,DEPT GYNECOL,9713 EZ GRONINGEN,NETHERLANDS
[3] UNIV GRONINGEN HOSP,DEPT TECH RES,CENT ANIM LAB,CTR BIOMED TECHNOL,9713 EZ GRONINGEN,NETHERLANDS
[4] TWENTE UNIV TECHNOL,DEPT APPL PHYS,7500 AE ENSCHEDE,NETHERLANDS
关键词
D O I
10.1203/00006450-199203000-00014
中图分类号
R72 [儿科学];
学科分类号
100202 ;
摘要
Transmission pulse oximetry is used for monitoring in many clinical settings. However, for fetal monitoring during labor and in situations with poor peripheral perfusion, transmission pulse oximetry cannot be used. Therefore, we developed a reflectance pulse oximeter, which uses the relative intensity changes of the reflected red and infrared light (red/infrared ratio) to measure the arterial oxygen saturation. The performance of the reflectance pulse oximeter was studied in acute experiments in fetal lambs. By stepwise reduction of the inspired oxygen concentration of the ewe, measurements were done at the fetal scalp at various arterial oxygen saturation levels (17-82%). Reflectance pulse oximeter readings were averaged over periods of 15 s and compared with simultaneously taken fetal arterial blood samples. A calibration curve for the relationship between red/infrared ratio and arterial oxygen saturation was obtained from 53 measurements in four fetal lambs, by linear regression analysis [red/infrared = 4.088 - (0.038.SaO2), r = 0.961. In these experiments, the pulse oximeter showed a precision of 4.7% oxygen saturation around the calibration curve, with a 95% confidence interval of +/- 9.4%.
引用
收藏
页码:266 / 269
页数:4
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