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. 2009 Apr 15;2009(2):CD006712. doi: 10.1002/14651858.CD006712.pub2

Hein 1999.

Methods Randomized controlled double blind trial. Nurse otherwise not involved in study drew the randomized envelope. 
 Karolinska Institute at Danderyds Hospital, Denderyd, Sweden.
Participants 140 pregnant women. ASA I‐II group. Elective termination of pregnancy.
Interventions Group 1: 1gm paracetamol suppository. 
 Group 2: placebo suppository. 
 All participants: no premedication. Induction of anesthesia with 0.1mg fentanyl and propofol. Maintenance with nitrous oxide in oxygen 2:1 and additional small doses of propofol as needed. Spontaneous breathing, assisted ventilation as needed. 5 units oxytocin at the end of the procedure. 
 All patients: Vacuum aspiration. 
 Rescue medication for postoperative pain diclofenac 100mg supp.
Outcomes Postoperative pain measured with a 10cm visual analog scale (0cm=no pain, 10cm=unbearable pain), measured 30 and 60 minutes postoperatively and at discharge. Analgesic and antiemetic requirements. Time until street fittness.
Notes Per e‐mail communication with Dr. Jakobsson: Gestational age 7‐12 weeks. Computer‐based randomization with envelopes. The study lasted over 2.5 months. 
 All procedures were uneventful and no complications were noted. No industry sponsorship.
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment? High risk C ‐ Inadequate