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Purpose  The aim of this study was to compare chronic fallopian tubal inflammatory disease and fibrosis between patients with general tubal pregnancy (TP) and TP with levonorgestrel (LNG) emergency contraception (EC) failure.    Methods  We retrospectively studied patients with general TP ( n  = 79) and TP following LNG‐EC failure ( n  = 81) within the same conception cycle. Information on the gynecological features of each subject was collected. Pelvic inflammatory disease and associated sequelae were assessed by the serum  Chlamydia trachomatis  (CT) IgG test, laparoscopic evaluation of tubal damage, and histopathological observation of tube tissues. Chi‐square and Student's  t ‐tests were employed to determine the difference between the two groups.    Results  Compared with general TP, cases of TP following LNG‐EC failure subjects were less likely to have a history of previous ectopic pregnancy (5.06% vs. 18.52%,  p  = 0.009) and adnexal surgery (6.33% vs. 22.22%,  p  = 0.010). Patients with TP following LNG‐EC failure were less likely to have pelvic inflammatory disease and associated sequelae than those with general TP, as revealed by positive reaction to anti‐CT IgG (18.18% vs. 35.94%,  p  = 0.031), assessment of tubal damage (grade I: 5.06% vs. 17.28%; grade II: 2.53% vs. 11.11%; grade III: 1.27% vs. 6.17%;  p  = 0.001), infiltration of chronic inflammatory cells (10.91% vs. 62.50%,  p  < 0.001), and positive Masson's staining (7.69% vs. 39.58%;  p  < 0.001).    Conclusions  Compared with cases of general TP, cases of TP following LNG‐EC failure exhibited reduced rates of CT infection, fallopian tubal inflammation, and/or fibrosis. © 2015 The Authors.  Pharmacoepidemiology and Drug Safety  published by John Wiley & Sons, Ltd.

Reduced prevalence of chronic tubal inflammation in tubal pregnancies after levonorgestrel emergency contraception failure