َAims:
to compare vaginal delivery pain score in both groups
Methods: In this single-blinded, randomized control trial,61primigravid singleton women with full-term pregnancy candidate for normal vaginal delivery, were entered the trial and divided in to pethedine (A) and paracetamol (B) group.At the time of admission, age and body mass index of mother and gestational age based on last day of period were recorded. In both groups, intramuscular promethasine and hyosine were administered to each patient at the first stage of delivery. Since beginning of active phase of delivery (50 mm of cervical dilatation and 100 % effacement), patients in group A received 50mg intramuscular pethedine injection. At the same time patients in group B, received an intravenous solution infusion containing 1000mg paracetamol and 300 cc of normal saline. After child birth, average labor pain was assessed using Visual Analogue Scale (VAS) by direct questioning from patient in both groups.Apgar score of neonate, duration of labor and incidence of drug complications in 24 hours after delivery were recorded in each group.
Primaryout come variable: labour pain score
secondary outcome variable: neonate Apgarscore, drug side effects
inclusion criteria: primigravid singleton women with fullterm pregnancy (gestational age more than 37 weeks based on ultrasound findings) candidated for normal vaginal delivery
exclusion criteria:were history of cardiac, liver and renal disease, anti-convulsive medication consumption, malpresentation of fetus, abnormal fetal monitoring during labor and multiple gestations