ABSTRACT
Labor pain, is one of the severe pains which is experienced by humans. Fear of this pain is caused elective cesarean for delivery in women. One of the safe and inexpensive drug methods for pain relief in delivery is entonox. In this study, the effect of entonox on the severity of pain, mothers hemodynamic and fetus apgar in natural vaginal delivery was investigated. In this clinical trial study, 60 women with an equal qualification who refferd to hajar hospital in Shahrekord were randomly chosen for vaginal delivery. They were randomly divided into two groups, one group [case] received entonox gas and other group [control] did not. Entonox was given to mothers by a mask after start of active phase of labor. The case group received entonox up to the end of the second phase of delivery, and the effect of entonox was recorded on the severity of pain and mother hemodynamic condition. Fetus apgar in natural vaginal delivery was compared between two groups. Data were analyzed using descriptive and analytic tests. The mean of pain scores in case group was 3.98 +/- 2.7 and 5.60 +/- 3.8 for control group [P=0.03] and it was 7.20 +/- 0.6 and 10 for each group in the second phose of delivery respectively. There were no significant differences between two groups in the maternal blood pressure, fetal heart rate and apgar scores. The mean of maternal heart rate and respiratory rate in case group were more than control group, but nausea and vomiting in the first and second stages of labor in case group were more than control group. In vaginal delivery, entonox can create adequate and effective analgesia without major complications for mothers and fetuses, and this can reduces the complications of cesarean section