Randomized clinical trial of transabdominal versus transcervical chorionic villus sampling methods

Area of Science:

• Medical research
• Obstetrics and Gynecology
• Prenatal diagnostics

Background:

• Chorionic villus sampling (CVS) is a key prenatal diagnostic tool.
• Transabdominal (TA) and transcervical (TC) approaches are common CVS methods.
• Comparative data on fetal risks and efficacy between TA-CVS and TC-CVS are crucial for clinical decision-making.

Purpose of the Study:

• To compare the relative advantages and disadvantages of transabdominal (TA) and transcervical (TC) chorionic villus sampling (CVS).
• To evaluate fetal risks and efficacy associated with each CVS technique.
• To assess procedural differences, including repeat insertions, tissue yield, and complications.

Main Methods:

• A clinical trial involving 1194 women randomized to either TA-CVS or TC-CVS.
• Gestation period at randomization: 7-12 weeks.
• Evaluation of fetal loss rates, procedural efficacy, complications, and tissue acquisition.

Main Results:

• Both TA-CVS and TC-CVS demonstrated comparable efficacy and similar fetal loss rates (16.5% for TA-CVS, 15.5% for TC-CVS).
• TA-CVS had a significantly lower rate of repeat device insertions.
• TC-CVS yielded a higher average weight of chorionic tissue, but was associated with more frequent bleeding.
• Peritoneal reaction was exclusively observed after TA-CVS; no technique-specific diagnostic issues were noted.

Conclusions:

• Transabdominal and transcervical CVS are equally effective prenatal diagnostic procedures with comparable fetal risks when performed by skilled operators.
• The choice between TA-CVS and TC-CVS may depend on specific patient factors and operator expertise, considering differences in complication profiles and procedural nuances.
• Further consideration of factors like repeat insertions, tissue yield, and bleeding incidence is warranted for optimal technique selection.