Non-surgical management and obstetric outcomes of heterotopic interstitial pregnancies

Objective: To assess the effectiveness and safety of non-surgical management for six heterotopic interstitial pregnancies.Material and methods: We retrospectively analyzed the data of six women diagnosed with heterotopic interstitial pregnancies who underwent non-surgical treatment at the CHA Bundang Medical Center between January 2007 and December 2017. Three heterotopic interstitial pregnancies were treated with sono-guided potassium chloride (KCl) injections. Two cases were managed expectantly. One heterotopic quadruplet pregnancy with twin, left interstitial, and tubal pregnancy was treated by sono-guided KCl injection and laparoscopic left salpingectomy. Complications and outcomes were measured.Results: Three cases were treated with sono-guided KCl injection and the intrauterine pregnancy continued to term. Intrauterine pregnancies were vaginally delivered without complications. One case that was treated expectantly was delivered at full term, while the other case resulted in spontaneous abortion. Quadruplet heterotopic pregnancy was successfully managed with sono-guided KCl injection and laparoscopic salpingectomy. Intrauterine twin pregnancy was successfully delivered by elective cesarean section at 37 + 0 weeks of gestation with healthy babies. Conclusions: KCl injection under ultrasonographic guidance could be a safer and more effective treatment option than surgical treatment in hemodynamically stable patients with fetal cardiac activity in interstitial pregnancy. Expectant management could be an option for patients with no fetal cardiac activity.