Reijo Korpela

Morphine-sparing Effect of Acetaminophen in Pediatric Day-case Surgery

BACKGROUNDnPostoperative pain is a major problem in day-case surgery in children. Nonsteroidal antiinflammatory drugs have gained popularity in management of pediatric surgical patients to reduce the need for opioids. The aim of this study was to evaluate the efficacy of different doses of rectal acetaminophen in day-case surgery in children.nnnMETHODSnA randomized, double-blinded, placebo-controlled study design was used. Patients (n = 120) were randomized to receive a single dose of 0, 20, 40, or 60 mg/kg of rectal acetaminophen after induction of anesthesia. General anesthesia was induced by mask ventilation with sevoflurane (7%) in nitrous oxide and oxygen and maintained with 2.5-4.0% end-tidal sevoflurane. Opioids or local anesthetics were not used. Postoperative pain was evaluated by behavioral assessment and physiologic measurements every 10 min after arrival at the postanesthesia care unit. The pain intensity was scored using a 0-100 visual analog scale used in the authors clinic. The need for rescue medication, intravenous morphine 0.1 mg/kg, was decided by the nurse, who was unaware of the rectal acetaminophen dose. The parents were interviewed by phone after 24 h regarding pain and its treatment, nausea, and vomiting. Rescue analgesia at home was rectal ibuprofen, 10 mg/kg.nnnRESULTSnIn the postanesthesia care unit pain scores were significantly lower in the 40- and 60-mg/kg groups compared with placebo and 20-mg/kg groups. Acetaminophen resulted in a dose-related reduction in the number of children who required postoperative rescue opioid, with significance reached with 40 or 60 mg/kg doses. Calculated dose of acetaminophen at which 50% of the children not requiring a rescue opioid was 35 mg/kg. The need for rescue analgesia at home during the first 24 h after surgery was also significantly less in patients in the 40- or 60-mg/kg groups than in the 0- or 20-mg/kg groups (20-17 vs. 80-63%). Thirty-three percent of patients receiving placebo had postoperative nausea and vomiting, compared with 0-3% in groups receiving 40 or 60 mg/kg acetaminophen.nnnCONCLUSIONSnA single dose of 40 or 60 mg/kg of rectal acetaminophen has a clear morphine-sparing effect in day-case surgery in children if administered at the induction of anesthesia. Moreover, children with adequate analgesia with acetaminophen have less postoperative nausea and vomiting.

A Single-Blinded, Randomized Comparison of Laparoscopic Versus Open Hernia Repair in Children

OBJECTIVE. The role of laparoscopic surgery in pediatric inguinal hernia repair is unclear. We aimed to compare day-case laparoscopic hernia repair with open repair. METHODS. A prospective, single-blinded randomized study in children aged 4 months to 16 years with unilateral inguinal hernia was performed. The primary outcome measure was the time to normal daily activities after surgery. Secondary outcome measures included postoperative pain, time in the operation room, results, and complications. RESULTS. Eighty-nine patients were enrolled (laparoscopic hernia repair: 47, open repair: 42). The mean number of days to normal activity after laparoscopic hernia repair and open repair was 2.4 and 2.5, respectively. Thirty-seven (79%) patients with laparoscopic hernia repair and 20 (42%) with open repair required rescue analgesia postoperatively. The median pain score in the second postoperative morning was significantly higher after laparoscopic hernia repair. The median times in the operation room for laparoscopic hernia repair and open repair were 63 and 38 minutes, respectively. Surgical and cosmetic results were similar at up to 2 years follow-up. CONCLUSIONS. Recovery and outcome were similar after open repair and laparoscopic hernia repair in children. Laparoscopic hernia repair was associated with increased theater time and postoperative pain.

Comparison of buprenorphine with morphine in the treatment of postoperative pain in children

The safety and efficacy of buprenorphine and morphine as postoperative analgesicsfor children were compared in 60 boys and girls 4 to 14 years old having elective orthopedic operations on upper or lower extremities. The drugs were given in a double-blind manner initially intravenously and thereafter by sublingual buprenorphine or intramuscular morphine administered as required to relieve pain until the third postoperative morning. The IV dose needed to achieve complete initial analgesia was 5.2 ± 2.8 μg/kg buprenorphine and 166 ± 100 μg/kg morphine. The duration of effect was significantly longer with buprenorphine than with morphine, 248 ± 314 and 114 ± 109 minutes, respectively (P = 0.03). The most common side effects were nausea and vomiting (28 and 16%) and urinary retention (21 and 19%) in the buprenorphine and morphine groups, respectively. Analgesia with sublingual buprenorphine was as effective and reliable as with intramuscular morphine but a longer duration of action could not be demonstrated.

The analgesic efficacy of acetaminophen, ketoprofen, or their combination for pediatric surgical patients having soft tissue or orthopedic procedures.

The combined use of acetaminophen and a nonsteroidal antiinflammatory drug has been shown to provide better postoperative analgesia than either drug alone in several adult studies. However, there are no pediatric studies analyzing similar effects when the currently recommended doses of acetaminophen are used. In a double-blind, placebo-controlled design we randomized 120 children, aged 1–9 yr, undergoing orthopedic or soft tissue surgery, into 3 groups to receive either acetaminophen 60 mg/kg rectally and 40 mg/kg orally, ketoprofen 2 mg/kg IV twice, or the combination of the active drugs. The first drug doses were given at anesthetic induction and the second doses 8 h thereafter. During anesthesia all children received sevoflurane and a continuous infusion of remifentanil. Postoperative pain was evaluated by the behavioral objective pain scale (0–9) for 24 h. The rescue medication was morphine 0.05 mg/kg IV. The primary outcome variable was morphine consumption. For statistical analysis, analysis of variance, &khgr;2 test and Kaplan-Meier survival analysis were used. Morphine requirement was less in the combination than in the acetaminophen group both in the postanesthesia care unit (2.5 ± 1.7 versus 3.9 ± 2.1 morphine doses) and during the 24-h postoperative follow-up (4.1 ± 2.5 versus 5.9 ± 2.9 morphine doses) (P < 0.05). No differences existed between the ketoprofen and the acetaminophen groups. The objective pain scale scores were lowest in the combination group both in the postanesthesia care unit and in the postoperative ward (P < 0.05). When children were divided based on their surgery, opioid requirement and pain scores were less in the combination than in the parent drug groups only after orthopedic surgery. The combination of acetaminophen 100 mg/kg and ketoprofen 4 mg/kg in a day provided better analgesia and lower pain scores after orthopedic, but not soft tissue, surgery in children.

Acetaminophen improves analgesia but does not reduce opioid requirement after major spine surgery in children and adolescents.

Study Design. A randomized, placebo-controlled, double-blind study to evaluate the effect of intravenously (IV) administered acetaminophen on postoperative pain in children and adolescents undergoing surgery for idiopathic scoliosis or spondylolisthesis. Objective. To evaluate effectiveness of IV-administered acetaminophen on postoperative analgesia, opioid consumption, and acetaminophen concentrations after major spine surgery in adolescents. Summary of Background Data. Scoliosis surgery is associated with severe postoperative pain, most commonly treated with IV-administered opioids. Nonsteroidal anti-inflammatory drugs (NSAIDs), as adjuvant to opioids, improve analgesia and reduce the need for opioids. However, by inhibiting cyclo-oxygenase enzymes peripherally, NSAIDs may inhibit bone healing. Acetaminophen, a centrally acting analgesic, does not have the adverse effects of NSAIDs and has improved analgesia in children after another orthopedic surgery. Methods. In an institutional review board approved study, 36 American Society of Anesthesiology patient classification I to III patients of 10 to 18 years of age were analyzed. Acetaminophen 30 mg/kg, administered IV or 0.9% NaCl was administered at the end of scoliosis or spondylolisthesis surgery, and thereafter twice at 8-hour intervals. Timed blood samples for acetaminophen determination were taken between 0.25 and 20 hours after the first dose. All patients received standard propofol-remifentanil anesthesia. Pain scores (visual analogue scale [VAS], 0–10), opioid consumption, and adverse effects were recorded. Results. In the surgical ward, 7 (39%) patients in the acetaminophen and 13 (72%) in the placebo group had a VAS pain score 6 or more (P < 0.05). There were fewer hours with VAS score 6 or more in the acetaminophen group compared with the placebo group (8.7% vs. 17.8% of the hours, P < 0.05). There was no difference in oxycodone consumption during the 24-hour follow-up between the 2 groups. Conclusion. IV-administered acetaminophen 90 mg/kg/day, adjuvant to oxycodone, did improve analgesia, but did not diminish oxycodone consumption during 24 hours after major spine surgery in children and adolescents. All acetaminophen concentrations were in nontoxic levels.

Optimally fitted tracheal tubes decrease the probability of postextubation adverse events in children undergoing general anesthesia.

Background :u2002The air leak test is recommended for assessing the appropriate size of an uncuffed tracheal tube (TT) in children. Our objectives were to determine whether there is a certain threshold air leak value beyond which a higher risk for adverse events after removal of TT can be predicted and to define other risk factors related to extubation.

Pediatric prehospital care provided by a physician-staffed emergency medical helicopter unit in Finland.

During an 18-month period ending on March 15, 1994, data on all pediatric patients treated by the Helsinki Area Emergency Medical Air Service (HEMS) in Southern Finland were collected. The HEMS operates a physician-staffed helicopter unit which is dispatched by alarm centers connected to a national 112 emergency phone system. Of 1481 emergency missions during the study period, 89 (8%) involved children less than 17 years old. Common pediatric emergencies were trauma (31%), seizures (29%), respiratory problems (14%), and cardiac arrest (9%). Fourteen patients were intubated, an intravenous line was started in 58 patients, and 32 patients received intravenous medication. Cardiopulmonary resuscitation was initiated in nine patients. Ten patients were evacuated by helicopter, and 22 patients were transported by ground ambulance with a HEMS physician escort to the hospital. According to this study, the HEMS physicians play an important role also in pediatric prehospital care in their operating area.

Diclofenac pharmacokinetic meta-analysis and dose recommendations for surgical pain in children aged 1-12 years

Background:u2002 Diclofenac is an effective, opiate‐sparing analgesic for acute pain in children, which is commonly used in pediatric surgical units. Recently, a Cochrane review concluded the major knowledge gap in diclofenac use is dosing information. A pharmacokinetic meta‐analysis has been undertaken with the aim of recommending a dose for children aged 1–12u2003years.