An economic evaluation of single dose systemic methotrexate and laparoscopic surgery for the treatment of unruptured ectopic pregnancy

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Abstract
To compare the direct and indirect costs of single dose systemic methotrexate with laparoscopic surgery for the treatment of unruptured ectopic pregnancy. A cost minimisation study undertaken alongside a randomised trial. Departments of Obstetrics and Gynaecology in three hospitals in Auckland, New Zealand. Sixty-two women with an ectopic pregnancy randomised to treatment with either a single dose of methotrexate (50 mg/m2) or laparoscopic surgery. Direct and indirect costs based on the results of the randomised trial. Direct costs per case were significantly lower in the methotrexate group (mean $NZ 1,470) than in the laparoscopy group (mean $NZ 3,083) with a mean difference of $NZ 1,613 (95% CI $NZ 1,166 - $NZ 2,061). These significant differences existed under a wide range of alternative assumptions about unit costs. The difference in direct costs in favour of methotrexate was greatest for women presenting with low pretreatment serum beta-hCG concentrations. Mean indirect costs were also significantly lower in the methotrexate group (mean $NZ 1,141) than in the laparoscopy group (mean $NZ 1899) with a mean difference of $NZ 758 (95% CI $NZ 277 - $NZ 1,240). For women presenting with pretreatment serum beta-hCG concentrations of over 1,500 IU/ L this difference in indirect costs is lost due to the prolonged follow up required and a higher rate of surgical intervention in women receiving methotrexate. This economic evaluation shows that treating suitable women with an ectopic pregnancy using systemic methotrexate therapy results in a significant reduction in direct costs. The indirect costs borne by the woman and her carers are only likely to be reduced in women with pretreatment serum beta-hCG concentrations under 1,500 IU/L.