Trophoblast sampling by blind transcervical aspiration.

Area of Science:

• Reproductive Medicine
• Maternal-Fetal Medicine
• Prenatal Diagnostics

Background:

• Early pregnancy termination procedures are common.
• Trophoblast biopsy is a potential method for early genetic analysis.
• Transcervical aspiration is an outpatient procedure with potential for patient acceptability.

Purpose of the Study:

• To evaluate the feasibility and safety of blind transcervical aspiration for trophoblast collection.
• To assess the success rate and contamination levels of trophoblast retrieval.
• To determine the potential for clinical application in detecting fetal genetic or chromosomal anomalies.

Main Methods:

• Blind transcervical aspiration was performed on 137 patients undergoing elective early pregnancy termination.
• Trophoblast samples were analyzed for successful collection, contamination (maternal tissue, blood), and procedural complications.
• Maternal serum alpha-fetoprotein levels were assessed for correlation with fetal damage.

Main Results:

• Trophoblast was obtained from 45 patients (33%), with no clear gestational age advantage between 8-11 weeks.
• Only 13% of samples were free of maternal tissue or blood contamination.
• Complications included amniotic sac perforation (1%), bleeding (34%), and infection (4%), posing risks to fetal survival.

Conclusions:

• Blind transcervical aspiration for trophoblast collection has a low success rate and high contamination.
• Significant risks to fetal survival exist, including bleeding and infection.
• Technique modifications are crucial before transcervical aspiration can be reliably used for prenatal genetic diagnostics.