Johnson N, Johnson V A, Bannister J, Lilford R J
Department of Obstetrics and Gynaecology, St James's University Hospital, Leeds.
Br J Obstet Gynaecol. 1990 Jun;97(6):493-8. doi: 10.1111/j.1471-0528.1990.tb02518.x.
Advances in oximetry have allowed the obstetrician to measure oxygen saturation in the fetus with non-invasive transcutaneous techniques. The influence of caput succedaneum formation on the oxygen saturation results obtained with a pulse oximeter was studied in 30 newborn infants. Caput was associated with a reduced oxygen saturation reading (mean reduction of 15%; P less than 0.001). This effect is partly due to a true drop in local tissue oxygenation but is exacerbated by a systematic error intrinsic to the physics of spectrophotometry. If continuous intrapartum oximetry is ever to become a part of routine obstetric monitoring then probes that pass through the cervix beyond the caput of the presenting part will be required if erroneously low readings are to be avoided.
脉搏血氧测定技术的进步使产科医生能够使用无创经皮技术测量胎儿的血氧饱和度。对30例新生儿研究了头颅血肿形成对用脉搏血氧仪测得的血氧饱和度结果的影响。头颅血肿与血氧饱和度读数降低有关（平均降低15%；P<0.001）。这种影响部分是由于局部组织氧合的真正下降，但分光光度法物理学固有的系统误差使其更加严重。如果产时连续血氧测定要成为常规产科监测的一部分，那么为避免错误的低读数，将需要能穿过宫颈到达先露部头颅血肿上方的探头。
