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Background: Droperidol and 5-HT3-receptor antagonists are among the most potent antiemetics to prevent postoperative nausea and vomiting (PONV). Combinations of these drugs have been used to increase the efficacy of antiemetic treatment. However, so far the quantitative effect of this combination has not been evaluated systematically. Methods: Results from randomised controlled trials investigating the efficacy of 5-HT3-receptor antagonists or droperidol alone versus the combination of both drugs to prevent PONV were included in a meta-analysis. Studies were systematically searched using Medline, EMBASE, the Cochrane-Library, and by manually screening the reference lists of matching review articles and current issues of locally available peer-reviewed anaesthesia journals. Seven papers with data on granisetron published by Fujii and co-workers were not considered. The main end point in each study was defined as occurrence of nausea, retching, or vomiting within 6 h (“early PONV”) and within 48 h (“late PONV”) after surgery. The relative risks (RR) and the numbers needed to treat (NNT) of the pooled data with their corresponding 95% confidence intervals (given in parentheses) were calculated using a random effects model. Results: Eight studies with 881 patients (adults: n=801; children (mean age: 8 yr): n=80) were included in the analysis. Droperidol was applied to 340 patients, 5-HT3-receptor antagonists to 198, and 343 were treated with a combination of both drugs. Seven out of these eight studies reported increased antiemetic efficacy of the combination group compared with the single drugs (droperidol and 5-HT3-receptor antagonists respectively). However, in none of the trials did this difference reach statistical significance. When a meta-analytic analysis based on these results was performed the combination of droperidol with a 5-HT3-recpetor antagonist was not associated with a significantly increased antiemetic efficacy. In 12 to 13 patients a 5-HT3-receptor antagonist has to be added to droperidol prophylaxis to prevent one additional patient from PONV who would have had suffered from PONV when treated with droperidol alone (RR “early PONV”: 1.52 (0.95–2.44); RR “late PONV”: 1.24 (0.89–1.74)). Similar results were obtained when the antiemetic effect of adding droperidol to a prophylaxis with 5-HT3-receptor antagonists was analysed. In this case 10 to 12 patients have to be treated with the 5-HT3-droperidol combination instead of with a 5-HT3-receptor antagonist alone to prevent one additional patient from PONV (RR “early PONV”: 1.55 (0.68–3.52); RR “late PONV”: 1.29 (0.77–2.17)). There were no reports of an increased incidence of adverse effects. Conclusion: The data on the combination of droperidol with 5-HT3-receptor antagonists suggest that there is a trend towards increased efficacy of the combination therapy compared to the single drugs. However, so far there are insufficient data to recommend this combination treatment for prophylaxis. [ABSTRACT FROM AUTHOR]

Background: Local anesthesia for lipoma excision can be feasible with anesthetic injection in the fascial plane between the lipoma and the surrounding soft tissues under real-time ultrasonography [ultrasound- guided lipoma plane (ULP) block]. The advantage of targeting a single anesthetic injection plane under ultrasound guidance may allow for technically easier block placement and long-term analgesic effects.Methods: Forty-eight patients were randomly assigned to receive ULP block, group A (n = 24) or traditional block, group B (n = 24). Primary outcome measure was the number of needle passes required to perform the blockade. The level of procedure pain and the time to first request of analgesia were assessed.Results: Median (interquartile range) needle passes required to complete the blockade was significantly less in the group A 1(1, 1) in comparison with the group B 3 (2.5, 3); P = 0.0001. Group A required fewer needle redirections 1.5 (1, 2) than group B 2 (2, 2.5); P = 0.001. Group A showed significantly less procedure-related pain 2 (2, 3) when compared with group B 4 (3, 4); P = 0.0001. The time to first rescue analgesic was significantly longer in group A (21.3 ± 4.7 h) in comparison with group B (4.4 ± 1.2 h); P = 0.001.Conclusion: Ultrasound-guided lipoma plane blockade reduces the number of needle passes required to complete the block and provides less procedure pain and longer pain relief compared with the traditional block in patients undergoing lipoma excision. [ABSTRACT FROM AUTHOR]

Background: Cannabinergic medications have been postulated to demonstrate efficacy in the management of pain. The aim of this systematic review was to assess the analgesic efficacy and adverse effects of cannabinoids when used for the management of acute pain.Methods: A systematic review was performed by searching the MEDLINE, EMBASE and CENTRAL databases, and the World Health Organization International Clinical Trials Registry Platform for human randomized controlled trials that assessed the analgesic efficacy of cannabinoids compared to placebo or active comparators. The reported outcomes for analgesic efficacy and adverse effects in included studies were qualitatively analysed.Results: Seven studies, including 611 patients were included in the systematic review. In five studies, cannabinoids were found to provide equivalent analgesia to placebo, in one study the analgesia provided by cannabinoids was superior to placebo, and in one study cannabinoids provided analgesia that was inferior to that provided by placebo. No synergistic or additive analgesic effect was observed when cannabinoids were used in combination with opioids. In five of the seven studies, certain adverse effects were more frequent with cannabinoid treatment than with placebo or active comparator.Conclusion: On the basis of the available randomized controlled trial evidence, cannabinoids have no role in the management of acute pain. [ABSTRACT FROM AUTHOR]