Transcervical embryo transfer as a risk factor for ectopic pregnancy

Area of Science:

• Reproductive Endocrinology
• In Vitro Fertilization
• Ectopic Pregnancy Research

Background:

• Ectopic pregnancy (EP) is a significant risk following in vitro fertilization (IVF).
• The ease and timing of transcervical embryo transfer (ET) are potential contributing factors to EP.
• Understanding these factors is crucial for improving IVF outcomes.

Purpose of the Study:

• To investigate the association between the ease and timing of transcervical ET and the risk of EP after IVF.
• To identify specific risk factors for EP in patients undergoing IVF.

Main Methods:

• Retrospective study conducted at a UK university-based IVF program.
• Analysis of 18 patients with EP and 314 patients with intrauterine pregnancy after transcervical ET.
• Evaluation of factors including ET difficulty, ET day (2 or 3), history of tubal subfertility, and previous EP.

Main Results:

• Difficult embryo transfer (ET) was associated with a significantly increased risk of ectopic pregnancy (EP), with an odds ratio (OR) of 3.91.
• The risk of EP was particularly high with a history of tubal subfertility (OR 5.73) and previous EP (OR 5.41).
• Embryo transfer on day 2 was associated with a higher risk (OR 2.26), especially if difficult (OR 3.88).

Conclusions:

• A difficult transcervical ET is a significant risk factor for EP after IVF.
• The risk of EP is substantially elevated in patients with a history of tubal damage or prior EP.
• Transfer timing is only a significant risk factor for EP when the ET procedure itself is difficult.