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An evaluation of the chorionic villus sampling learning curve
R K Silver1, S N MacGregor, J S Sholl
1Division of Maternal-Fetal Medicine, Evanston Hospital, IL 60201.
American Journal of Obstetrics and Gynecology
|September 1, 1990
Summary
A learning curve exists for chorionic villus sampling (CVS). While fetal loss is critical, other metrics like single-pass success better indicate operator competence for new CVS programs.
Area of Science:
- Medical procedures
- Obstetrics
- Fetal medicine
Background:
- Fetal loss rates after chorionic villus sampling (CVS) correlate with operator experience.
- Centers with lower procedure volumes initially report loss rates comparable to high-volume centers.
- Fetal loss may be an insensitive metric for evaluating operator learning curves in CVS.
Purpose of the Study:
- To quantify the learning curve for chorionic villus sampling (CVS).
- To analyze the initial experience of a single operator performing 185 consecutive CVS procedures.
- To identify more sensitive indicators of operator competence in CVS.
Main Methods:
- Analysis of 185 consecutive transcervical and transabdominal CVS procedures performed by one operator.
- Data collected between May 1988 and August 1989.
- Evaluation of placental aspiration attempts, pregnancy losses, and sample adequacy.
Main Results:
- A significant reduction in placental aspirations was observed over the study period (p < 0.001).
- The transabdominal technique showed significant improvements in fewer passes (p < 0.00001) and increased sample weight per attempt (p < 0.01).
- Three pregnancy losses and five cases of insufficient material occurred.
Conclusions:
- While fetal loss is a critical safety measure, it may not fully reflect operator learning.
- Metrics such as the single-pass success rate are more appropriate indicators of CVS competence.
- These findings can guide centers initiating new CVS programs.