Pregnancy loss rates after midtrimester amniocentesis.
OBJECTIVE
The purpose of this study was to quantify the contemporary procedure-related loss rate after midtrimester amniocentesis using a database generated from patients who were recruited to the First And Second Trimester Evaluation of Risk for Aneuploidy trial.


METHODS
A total of 35,003 unselected patients from the general population with viable singleton pregnancies were enrolled in the First And Second Trimester Evaluation of Risk for Aneuploidy trial between 10 3/7 and 13 6/7 weeks gestation and followed up prospectively for complete pregnancy outcome information. Patients who either did (study group, n=3,096) or did not (control group, n=31,907) undergo midtrimester amniocentesis were identified from the database. The rate of fetal loss less than 24 weeks of gestation was compared between the two groups, and multiple logistic regression analysis was used to adjust for potential confounders.


RESULTS
The spontaneous fetal loss rate less than 24 weeks of gestation in the study group was 1.0% and was not statistically different from the background 0.94% rate seen in the control group (P=.74, 95% confidence interval -0.26%, 0.49%). The procedure-related loss rate after amniocentesis was 0.06% (1.0% minus the background rate of 0.94%). Women undergoing amniocentesis were 1.1 times more likely to have a spontaneous loss (95% confidence interval 0.7-1.5).


CONCLUSIONS
The procedure-related fetal loss rate after midtrimester amniocentesis performed on patients in a contemporary prospective clinical trial was 0.06%. There was no significant difference in loss rates between those undergoing amniocentesis and those not undergoing amniocentesis.


METHODS
II-2.
Eddleman
Keith A
KA
Mount Sinai School of Medicine, New York, New York, USA. keith.eddleman@mssm.edu
Malone
Fergal D
FD
Sullivan
Lisa
L
Dukes
Kim
K
Berkowitz
Richard L
RL
Kharbutli
Yara
Y
Porter
T Flint
TF
Luthy
David A
DA
Comstock
Christine H
CH
Saade
George R
GR
Klugman
Susan
S
Dugoff
Lorraine
L
Craigo
Sabrina D
SD
Timor-Tritsch
Ilan E
IE
Carr
Stephen R
SR
Wolfe
Honor M
HM
D'Alton
Mary E
ME
D000022:Abortion, Spontaneous / Q000209:etiology*; D000328:Adult; D000649:Amniocentesis / Q000009:adverse effects*; D004314:Down Syndrome / Q000175:diagnosis; D005260:Female; D005313:Fetal Death / Q000453:epidemiology* / Q000209:etiology; D006801:Humans; D008423:Maternal Age; D011247:Pregnancy; D011256:Pregnancy Outcome; D011262:Pregnancy Trimester, Second