*5.5.1 Previous quality of evidence*

Lee et al. found low-quality evidence supporting the use of PC6 acupoint stimulation over sham (compared to the last update in 2009) and moderate-quality evidence showing no difference between PC6 acupoint stimulation and antiemetic drugs to prevent PONV. There was inconclusive evidence supporting the use of a combined strategy of PC6 acupoint stimulation and antiemetic drugs over drug prophylaxis, and further high-quality trials are needed [76].
