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Maternal Lyme disease and congenital heart disease: A case-control study in an endemic area.

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Abstract

OBJECTIVE:

The purpose of this study was to determine whether maternal
Lyme disease increases the risk of congenital heart defect.

STUDY DESIGN:

This retrospective case-control study was carried out at a medical center in a suburban area where
Lyme disease is endemic. Case patients comprised 796 children with a diagnosis of congenital cardiac anomaly. Control subjects comprised 704 children without cardiac defects selected from the records of the same pediatric cardiology service. Maternal histories were obtained through a mailed questionnaire survey. Unconditional logistic regression analyses examined the relationship between a history of preconception and prenatal clinical
Lyme disease or tick bite and case or control status.

RESULTS:

There was no association between congenital heart defect and maternal tick bite (adjusted odds ratio 1.1, 95% confidence interval 0.5-2.5) or maternal
Lyme disease within 3 months of conception or during pregnancy (adjusted odds ratio 0.9; 95% confidence interval 0.2-3.6).

CONCLUSION:

A woman who has been bitten by a tick or is treated for
Lyme disease during or before pregnancy is not at increased risk for giving birth to a child with a congenital heart defect.

Am J Obstet Gynecol. 1999 Mar;180(3 Pt 1):711-6. Research Support, U.S. Gov’t, P.H.S.

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