Description

This is a prospective cohort study of outpatient adults with chronic abdominal wall pain who receive abdominal wall injections with lidocaine at an academic medical center. Thirty patients will be enrolled. A baseline assessment will include a medical history review and survey administration (Pain Catastrophizing Scale, Psychological Inflexibility in Pain Scale, Patient-Reported Outcomes Measurement Information System-29, Recurrent Abdominal Pain Intensity and Disability scale). Subjects will undergo Quantitative Sensory Testing to measure their pain tolerance and thresholds. The primary outcome to be measured is the change in abdominal wall pain at 1 week, 4 weeks and 12 weeks following the abdominal wall injection, with improvement defined as a 50% reduction in baseline pain score measured using an 11-point numeric scale. Data analysis will consist of basic summary statistics to describe the mean, median, and standard deviation for demographic variables and clinical measures. A one-sample t-test or Wilcoxon test will be used to compare differences in continuous values between time points. Chi-square tests will be used to compare differences in categorical variables. An alpha of 0.05 will be used for all statistical tests. Univariate and multivariate logistic regression will be used to assess for factors associated with pain reduction.