[Normal values of gases in the vein of the umbilical cord during the postpartum period and postcesarea immediately in normal fetuses to term].

Background: To be able to diagnose and catalogue a patient with imbalance of the acid basic condition a gasometría must be realized. The pH and the gasometría of the blood of umbilical cord are useful tools to study the immediate situation of the newborn child. The values gasométricos in the vein and the artery of the umbilical cord change according to the geographical altitude.

Objective: To identify the normal values of the venous gases of the umbilical cord in the postpartum immediate one of normal fetuses to term, born by obstetric resolution, without hurt, in the Spanish Hospital of the Mexico City and to identify the difference with the considered normal values for other institutions of different conditions of the Mexican Republic located to different altitudes.

Material And Method: Transversal, prospective, descriptive and observacional study effected in the service of Obstetrics of the Hospital Español of Mexico (Maternidad Mundet). All the patients were included pregnant woman of term, with pregnancy of normal evolution, with an obstetric resolution without evidence of foetal hurt that they deposited with labor or for elective Caesarean.

Results: The average of the curves of normal distribution of the pH, of the PCO2, of the HCO3, of the PO2, of the base excess and of the foetal hemoglobin they were: 7.34, 39.3081, 20.66, 29.3529,-4.09 and 15.18, respectively.The distribution curves of the analyzed values were normal, in no.case there was asymmetry, with a not significant Kolmogorov.

Conclusions: The gasometric of the cord is a simple, practical method and, especially I target to value the foetal condition intraparto. The values found in our analysis do not demonstrate statistically significant differences with the values of other studies effected to minor altitudes that that of the Mexico City. The analysis that here one presents is a partial check of the final sample that will belong 300 individuals.