Mepivacaine Reduces IUD Placement Pain

TOPLINE:

Mepivacaine instillation significantly reduced pain during intrauterine device (IUD) placement in nulliparous women. More than 90% of women in the intervention group reported tolerable pain compared with 80% of those in the placebo group.

METHODOLOGY:

• A multicenter, double-blind, randomized, placebo-controlled trial was conducted in 12 centers in Sweden, which involved 151 nulliparous women aged 18-31 years.
• Participants were randomly assigned to receive either 10 mL of 20 mg/mL mepivacaine or 10 mL of 0.9 mg/mL sodium chloride (placebo) through a hydrosonography catheter 2 minutes before IUD placement.
• Pain scores were measured using a 100-mm visual analog scale (VAS) at baseline, after instillation, during IUD placement, and 10 minutes post-placement.
• The primary outcome was the difference in VAS pain scores during IUD placement between the intervention and placebo groups.

TAKEAWAY:

• Mepivacaine instillation resulted in a statistically significant reduction in mean VAS pain scores during IUD placement, with a mean difference of 13.3 mm (95% CI, 5.75-20.87; P
• After adjusting for provider impact, the mean VAS pain score difference remained significant at 12.2 mm (95% CI, 4.85-19.62; P
• A higher proportion of women in the mepivacaine group reported tolerable pain during IUD placement (93.3%) than the placebo group (80.3%; P = .021).
• No serious adverse effects were associated with mepivacaine instillation, and there were no cases of uterine perforation in either group.

IN PRACTICE:

“We argue that the pain reduction in our study is clinically important as a greater proportion of women in our intervention group, compared to the placebo group, reported tolerable pain during placement and to a higher extent rated the placement as easier than expected and expressed a willingness to choose IUD as contraception again,” the authors of the study wrote.

SOURCE:

This study was led by Niklas Envall, PhD; Karin Elgemark, MD; and Helena Kopp Kallner, MD, PhD, at the Department of Clinical Sciences, Danderyd Hospital, Karolinska Institutet in Stockholm, Sweden. It was published online in American Journal of Obstetrics & Gynecology.

LIMITATIONS:

This study’s limitations included the exclusive focus on one type of IUD (LNG-IUS 52 mg, 4.4 mm), which may limit generalizability to other IUD types. Additionally, only experienced providers participated, which may not reflect settings with less experienced providers. Factors such as anticipated pain and patient anxiety were not systematically assessed, potentially influencing pain perception.

DISCLOSURES:

Envall received personal fees from Bayer for educational activities and honorarium from Medsphere Corp USA for expert opinions on long-acting reversible contraception. Kallner received honoraria for consultancy work and lectures from multiple pharmaceutical companies, including AbbVie, Actavis, Bayer, and others. The study was funded by the Swedish Research Council. Additional disclosures are noted in the original article.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.