RESUMEN
Objective To explore the clinical value of colour doppler flow imaging (CDFI) in selecting the ectopic pregnancy(EP) suitable for medical treatment. Methods 50 cases of ectopic pregnancy with hematodynamic stability were injected with a single dose of 50mg/m 2 MTX after CDFI examination. All patients were followed up until clinical results were confirmed. The CDFI characteristics of the failure and the success cases were analysed in combination with their serum HCG levels, and a CDFI-based pretherapeutic score were designed. Results CDFI could reflect the viability of ectopic fetus directly.There was a significant difference in the successful rate of medical treatment of ectopic pregnancy among the patients with various types of CDFI images and the various levels of serum HCG (P10 had the high failure rate, thus medical treatment of ectopic pregnancy is not recommended to them.