胚胎植入過程是一相當關鍵之步驟
困難植入會造成懷孕率明顯下降 (38.2% vs. 27.1%)

Fertil Steril. 2017 Jan 12. pii: S0015-0282(16)63020-0. doi: 10.1016/j.fertnstert.2016.11.020. [Epub ahead of print]

What is a difficult transfer? Analysis of 7,714 embryo transfers: the impact of maneuvers during embryo transfers on pregnancy rate and a proposal of objective assessment.

Kava-Braverman A1, Martínez F2, Rodríguez I2, Álvarez M2, Barri PN2, Coroleu B2.

Author information

Abstract

OBJECTIVE:

To establish the relationship between the degree of difficulty of ET and pregnancy rate (PR), with a view to proposing an algorithm for the objective assessment of ET.

DESIGN:

Retrospective, observational study.

SETTING:

In vitro fertilization unit.

PATIENT(S):

Women undergoing assisted reproductive technology (ART) with ET after IVF/intracytoplasmic sperm injection, in whom fresh embryo transfer or frozen-thawed embryo transfer was performed.

INTERVENTION(S):

None.

MAIN OUTCOME MEASURE(S):

Clinical pregnancy rate (CPR).

RESULT(S):

A total of 7,714 ETs were analyzed. The CPR was significantly higher in the cases of easy ET compared with difficult ET (38.2% vs. 27.1%). Each instrumentation needed to successfully deposit the embryos in the fundus involves a progressive reduction in the CPR: use of outer catheter sheath (odds ratio [OR] 0.89; 95% confidence interval [CI] 0.79-1.01), use of Wallace stylet (OR 0.71; 95% CI 0.62-0.81), use of tenaculum (OR 0.54; 95% CI 0.36-0.79). Poor ultrasound visualization significantly diminish the CPR.

CONCLUSION(S):

The CPR decreases progressively with the use of additional maneuvers during ET. An objective classification of the instrumentation applied during ET is proposed.