RESUMO
Frequent measurement of pH and PCO2 levels of fetal blood during labour provides an insight into the presence and nature of fetal asphyxia, effectiveness of in utero resuscitation and the need for operative delivery. A pH measuring system utilizing a hydrogen ion-selective polymer membrane built into a fetal probe suitable for making intermittent measurements on the fetal scalp during labour is described. Probe design, construction of electrodes and preliminary results obtained using the system in vitro are presented.
Assuntos
Eletrodos , Sangue Fetal/análise , Monitorização Fetal/instrumentação , Concentração de Íons de Hidrogênio , Aminas , Desenho de Equipamento , Humanos , Análise de RegressãoRESUMO
Blood was taken for plasma glucose estimation one hour after oral ingestion of 50 g of glucose in 948 of 970 women booking at an antenatal clinic during one year. An abnormal result (greater than or equal to 7.7 mmol/l) was obtained in 74 subjects of whom 68 subsequently had an oral glucose tolerance test. Fourteen of these women (1.5 per cent of the study population) were found to have chemical diabetes.