Effect of topical glyceryl trinitrate cream on pain perception during intrauterine device insertion in multiparous women; a randomized double-blinded placebo-controlled study.

OBJECTIVE: Intrauterine contraceptive device (IUD) insertion-related pain presents a push beyond the decline of women to use IUD for family planning. We aimed to investigate the analgesic effect of glyceryl trinitrate cream (GTN) in reducing pain during IUD insertion.

MATERIALS AND METHODS: We conducted a randomized double-blinded placebo-controlled study (NCT02708251, clinicaltrials.gov) in a tertiary University hospital. Reproductive-aged women requesting Copper IUD for contraception were considered. Eligible women for IUD insertion were randomized (1:1) to glyceryl trinitrate cream (GTN arm) or Placebo. Three minutes before IUD insertion, 1 ml of GTN cream or placebo was applied to the cervical lip at the planned tenaculum site, followed by 1 ml placed in the cervical canal up to the level of the internal os using a Q-tip applicator. Our outcomes were the participant's self-rated pain perception utilizing a 10-cm Visual Analogue Scale (VAS) during cervical tenaculum placement, uterine sound and IUD insertion, then 15 minutes post-procedure.

RESULTS: 100 women were enrolled and randomized to GTN arm (n = 50) or placebo (n = 50). Women in the GTN arm reported lower VAS scores during tenaculum placement, sound and IUD insertion (median: 2 vs. 4, p < 0.0001; 2.5 vs. 4.5, p < 0.001;3 vs. 5.5, p < 0.0001, respectively). Higher ease of insertion score was also determined among GTN arm (mean ± SD: 6.9 ± 1.15 vs. 4.7 ± 1.38, p < 0.0001). Additionally, women in the GTN arm were more satisfied by the end of the insertion (92% vs. 74%, p = 0.003).

CONCLUSION: Application of cervical GTN cream before IUD insertion seems to reduce the induced pain with subsequent easy insertion.