Polymorphisms of 5-hydroxytryptamine receptor type 3B gene and clinical characteristics for vomiting after breast surgery in chinese han female population.

WHAT IS KNOWN AND OBJECTIVE: The 5-hydroxytryptamine type 3B receptor (HTR3B) is involved in postoperative vomiting. We aimed to investigate whether genomic variations of rs1176744 and rs1672717 in HTR3B are associated with postoperative vomiting (POV) in the Chinese Han female population after surgery. METHODS: Five hundred and sixty-eight female patients classified as ASA I-II undergoing breast surgery under standard general anaesthesia were enrolled in the study. Episodes of POV in the first 24 h after surgery were recorded. Targeted single nucleotide polymorphisms (SNPs) in the HTR3B gene were identified by genotyping using the SNPscanTM technique. Univariate and multivariate analyses were conducted to investigate the association between SNPs and POV. RESULTS: We eventually analysed 407 subjects undergoing breast surgery under general anaesthesia. Of these, 104(25.6%) patients suffered POV within 24 h after surgery. In the multivariate logistic regression analysis, we found that age≥50 years (p = 0.012) and longer duration of surgery (p = 0.019) were independent risk factors for POV. Simultaneously, in the dominant model of rs1672717, compared with the AA genotype, GG+GA carriers suffered more POV (OR=1.669, p = 0.038). However, the use of atropine reduced the incidence of POV in our study (p = 0.019). WHAT IS NEW AND CONCLUSION: Our investigation demonstrated that polymorphism of rs1672717 (HTR3B) may be a genetic risk factor for developing POV. TRIAL REGISTRATION: clinicaltrials.gov identifier: NCT03705026.