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Related Experiment Videos

Limb deficiencies in newborn infants.

C K McGuirk1, M N Westgate, L B Holmes

  • 1Genetics and Teratology Unit, Pediatric Service, Massachusetts General Hospital, Boston, Massachusetts, USA. cmcguirk@partners.org

Pediatrics
|October 3, 2001
PubMed
Summary

Limb reduction defects affect 0.69/1000 infants. Vascular disruption is the most common cause, accounting for 35% of cases, highlighting the need for surveillance programs in evaluating infant limb deficiencies.

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Area of Science:

  • Medical surveillance
  • Birth defects epidemiology
  • Congenital abnormalities

Background:

  • Limb reduction defects (LRDs) are congenital abnormalities requiring accurate prevalence data.
  • Establishing baseline rates is crucial for evaluating infants exposed to potential teratogens, particularly those causing vascular disruption.
  • Understanding the etiology of LRDs aids in risk assessment and prevention strategies.

Purpose of the Study:

  • To determine the prevalence of all types of limb reduction defects.
  • To specifically ascertain the prevalence of LRDs potentially caused by vascular disruption.
  • To provide a baseline for evaluating infants exposed in utero to vascular disrupting teratogens.

Main Methods:

  • A hospital-based Active Malformations Surveillance Program identified LRDs in liveborn, stillborn, and electively terminated infants.
  • Data collection spanned 1972–1974 and 1979–1994, with an extended search to ensure comprehensive ascertainment.
  • Limb defects were classified by anatomical location, affected digits, and apparent cause.

Main Results:

  • The overall prevalence of limb deficiency was 0.69 per 1000 births.
  • Vascular disruption was identified as the apparent cause in 35% of LRD cases.
  • The prevalence of LRDs attributed to presumed vascular disruption was 0.22 per 1000 births.

Conclusions:

  • Hospital-based surveillance, including elective terminations, effectively establishes LRD prevalence.
  • Clinical findings provide more accurate etiological classification of LRDs than ICD codes alone.
  • The study provides essential baseline data on LRDs, particularly those linked to vascular disruption.

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