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Objective This study investigates the effects of  COMTval158met  gene polymorphism on maternal anxiety and pain during delivery and on the analgesic and anxiety efficacy of dexmedetomidine during delivery. Methods Sixty-one pregnant women, who were hospitalized in our hospital from January to November of 2016 were recruited and randomly divided into two groups, F and D groups. The pregnant women in the F group were given labor analgesia with ropivacaine combined with fentanyl. The pregnant women in the D group were given labor analgesia with ropivacaine combined with dexmedetomidine. Before and after labor analgesia, the genotype of  COMT  in the blood from two groups was detected, and the situation of labor anxiety and analgesia was analyzed. Then, the relationship between labor anxiety, analgesia, and  COMT  polymorphism was analyzed. Results In the 61 pregnant women, there were 30 women of wild homozygotes (GG) of  COMT , 22 women of mutant heterozygotes (GA), and nine women of mutant homozygotes (AA), the mutation rate of allele A was 23.77%. The anxiety status score, anxiety trait score, and pain score in the AA genotype were significantly higher than those in the GG and GA genotype ( p    0.05); there was no significant difference in pain between group D and F in GG, GA, and AA genotypes ( p  &gt; 0.05). There was no significant difference in pain and anxiety scores between the three genotypes in group D ( p  &gt; 0.05), there was significant difference in pain scores among the three genotypes in group F ( p    0.05). Conclusions The mutation of the  COMTval158met  gene leads to increased anxiety and pain during childbirth. The effect of dexmedetomidine on the anxiety of GG and AA genotypes is better than that of fentanyl, and the mutation of the  COMTval158met  gene has no impact on dexmedetomidine effect.

Comparative study of the efficacy of dexmedetomidine and fentanyl on anxiety and pain of parturients with different COMTva1158met genotypes