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On monitoring the multiply malformed infant. I: Case-finding, case-recording, and data handling in a Latin American
Insights
The Latin American Collaborative Study of Congenital Malformations (ECLAMC) monitors birth defects using a clinical-epidemiological approach. This method aids in detecting teratogenic agents by analyzing congenital anomaly patterns in newborns.
Area of Science:
- Epidemiology
- Teratology
- Clinical Genetics
Background:
- Birth defects surveillance is crucial for public health.
- Early detection of teratogenic agents can prevent malformations.
- The Latin American Collaborative Study of Congenital Malformations (ECLAMC) has established methods for monitoring congenital anomalies.
Purpose of the Study:
- To describe the clinical-epidemiological methods used by ECLAMC for monitoring multiply malformed infants.
- To assess the birth prevalence of different patterns of multiple congenital anomalies (MCA).
- To facilitate the early detection of potential teratogenic agents.
Main Methods:
- Analysis of observed versus expected rates for all congenital anomalies (CA).
- Application of rate analysis to specific multiple congenital anomaly (MCA) patterns.
- Clinical case presentation for infants with three or more independent CA, defined as true MCA.
Main Results:
- During 1982-1983, 299,231 infants were examined.
- Multiply malformed infants (excluding Down syndrome) occurred at a rate of 4/10,000 births.
- Of these, 40% had syndromes, 30% had anomaly pairs, and 30% had true MCA.
Conclusions:
- The ECLAMC methodology effectively identifies patterns of congenital anomalies.
- A rate of approximately five true MCA cases per week in a large birth cohort is manageable for individual clinical assessment.
- The study supports the utility of this approach for teratogen surveillance.
Abstract:
The methods used by the Latin American Collaborative Study of Congenital Malformations (ECLAMC) for monitoring the birth prevalence of multiply malformed infants are based on a clinical-epidemiological approach oriented to the early detection of teratogenic agents. They consist of three steps: 1) the analysis of observed vs expected rates of all congenital anomalies (CA), including their isolated and associated forms; 2) the same type of analysis applied to each multiple congenital anomaly (MCA) pattern; and 3) a clinical case presentation reserved only for those considered as true MCA because of presence of three or more independent CA. During the period 1982-1983 299,231 infants were examined. Multiply malformed infants, excluding Down syndrome cases, were born at a rate of 4/10,000, 40% having syndromes (two or more interrelated CA), 30% anomaly pairs, ie, two independent CA, and 30% true MCA cases. In a program with 150,000 births per year, as in ECLAMC, this means about five true MCA cases per week, a number easily handled individually on a clinical basis.