بررسی تأثیر تجویز اکسیژن به مادر در مرحله دوم زایمان بر روی گازهای خون بند ناف

This study was conducted to assess the role of maternal oxygen &nbsp;&nbsp; administration during the second stage of labor on umbilical cord blood gas &nbsp;&nbsp; values.&nbsp; This study was done in Fatemieh hospital on 160 pregnant women &nbsp;&nbsp; who were admitted for vaginal delivery and had the inclusion criteria. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; A group of 80 women with term pregnancy were administrered oxygen &nbsp;&nbsp; during the second stage of labor and another group of 80 women with &nbsp;&nbsp; term pregnancy acted as control (Randomized clinical trial). Umbilical cord &nbsp;&nbsp; blood gas values were measured immediately&nbsp; after birth. Apgar score and &nbsp;&nbsp; duration of oxygen administration of two groups were documented. Blood &nbsp;&nbsp; gas values , apgar score , duration of oxygen therapy , duration of second &nbsp;&nbsp; stage of labor also were recorded. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; In the case group: The umbilical artery pH value was 7.25 (7.06-7.38) and &nbsp;&nbsp; umbilical vein pH was > 7.31 (7.13-7.45). Umbilical artery pH in the control &nbsp;&nbsp; group was 7.28 (7.08-7.96) and umbilical vein pH was 7.31 (7.02-7.44). There &nbsp;&nbsp; was no statistically difference between means of umbilical cord blood gas &nbsp;&nbsp; values of the groups (case and control , P>0.05). There was perfect negative &nbsp;&nbsp; correlation between umbilical cord blood gas values and duration of &nbsp;&nbsp; oxygen administration (P<0.001 , r =-0.5). &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; In fact oxygen administration in second stage of labor has not any &nbsp;&nbsp; effect on cord blood gas analysis , provided that no clinical evidence of &nbsp;&nbsp; danger for mother or fetus present. Besides prolonged oxygen &nbsp;&nbsp; administration can cause&nbsp; decrease in arterial pH.