Abstract
We set out to investigate efficacy, methotrexate (MTX) plasma concentrations, and toxicity following a single injection of MTX into the gestational site in the treatment of ectopic pregnancy. This was a non-randomised, non-blinded prospective clinical trial. Eighteen women with unruptured tubal pregnancies and in stable haemodynamic condition were studied. MTX 1 mg/kg was injected into the ectopic pregnancy guided by laparoscopy. Serum g hCG levels were estimated before MTX treatment and on days 1, 4 and 13. In 14 patients plasma MTX was determined 1 h and 6 h after the injection. We found an adequate decline in g hCG was achieved in 17 (94%) patients, and tubal surgery avoided in 15 (83%). At 6 hours following drug administration, mean plasma MTX concentration (0.36 - 0.21 µM) was only 12% of mean peak level (3.1 - 1.0 µM). Six (39%) demonstrated slightly elevated, but completely reversible liver enzymes. None reported any subjective adverse effects. At the 4-7 year follow-up nine of 12 (75%) women had delivered healthy babies. It is concluded that intratubal injection of 1 mg/kg MTX appears to be an effective and safe treatment of ectopic pregnancy.
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