Self-Administered Lidocaine Gel for Pain Management With First Trimester Surgical Abortion: A Randomized Controlled Trial

Overview

Despite global efforts to decrease discomfort during surgical abortion, pain remains a limiting factor in where and how procedures are performed. Several studies have investigated different methods of delivering cervical anesthesia prior to abortion, however to the best of the investigators' knowledge, there is no published data that 1) rigorously examines the effect of a time interval between local anesthetic administration and procedure initiation, or 2) explores whether adequate pain relief is possible through self-administered, non-invasive means alone. Research in this area has a significant public health impact, given the large number of women worldwide who seek abortions. The investigators propose to explore the effect of a locally applied vaginal lidocaine gel in place of the traditional paracervical block prior to first trimester surgical abortion. They hypothesize that lidocaine gel is no worse than paracervical block at decreasing abortion related pain at a variety of time points throughout the procedure. This is a non-inferiority, open label, randomized controlled trial. If self-administered vaginal gel is acceptable and effective, it would increase options for pain control during abortion and other gynecologic procedures.

Abortion remains one of the most common surgical procedures in the world, regardless of region or development status \[Guttmacher 2012\]. In the United States, at least half of all women will experience an unintended pregnancy by age 45, and one third of all women will have had an abortion by this same age \[Guttmacher 2014\]. Despite universal efforts to increase the comfort of these procedures, pain remains a limiting factor in where and how abortion is performed. Recent estimates reveal that 70-97% of women experience pain during abortion \[Renner 2010, Paul 2009, Belanger 1988\]. Strategies to reduce all aspects of abortion related pain have the potential for significant public health impact, given the large number of women who seek these services. A survey of National Abortion Federation clinics found that to date, most providers (84%) employ the use of a lidocaine paracervical block for cervical anesthesia prior to abortion \[O'Connell 2009\], but traditionally without a waiting period between lidocaine administration and procedure initiation. To the best of our knowledge, there are no published studies that 1) rigorously examine the effect of a time interval between local anesthetic administration and procedure initiation, or 2) explore whether adequate pain relief is possible through self-administered, non-invasive means alone. The investigators propose to explore the effect of a locally applied lidocaine gel in place of the traditional paracervical block to decrease abortion related pain. The objective of this study is to compare pain control at various time points during first trimester surgical abortion using a locally applied, patient-administered lidocaine gel as compared to traditional lidocaine paracervical block. If a patient-administered vaginal gel is acceptable and effective, it would increase options for pain control during abortion and other gynecologic procedures, and perhaps replace paracervical injection altogether. Hypothesis: Patients who receive lidocaine gel applied 30 minutes prior to first trimester surgical abortion will have pain control equivalent to that of a traditional paracervical block. This is a non-inferiority, open-label, randomized controlled trial of women ages 18 and older undergoing first trimester surgical abortion at 50/7 to 116/7 weeks.