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Mortality in achondroplasia.

J T Hecht, C A Francomano, W A Horton

    American Journal of Human Genetics
    |September 1, 1987
    PubMed
    Summary
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    Achondroplasia increases mortality risk across all ages, particularly in children due to brain-stem compression. Cardiovascular issues and spinal stenosis contribute to higher mortality in adults.

    Area of Science:

    • Medical Genetics
    • Orthopedics
    • Cardiology
    • Pediatrics

    Background:

    • Achondroplastic individuals exhibit characteristic bony abnormalities.
    • Previous studies suggest potential increased mortality in achondroplasia.
    • Specific causes and age-related mortality patterns require further investigation.

    Purpose of the Study:

    • To determine standardized mortality ratios (SMRs) in a cohort of achondroplastic individuals.
    • To identify age-specific causes of increased mortality.
    • To investigate the contribution of bony abnormalities, such as spinal stenosis, to mortality.

    Main Methods:

    • Historical cohort study utilizing data from Medical Genetics Clinics.
    • Calculation of Standardized Mortality Ratios (SMRs) across different age groups.

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  • Analysis of causes of death, including sudden death, CNS, respiratory, and cardiovascular events.

    • Main Results:

    • Overall SMR was 2.27, indicating increased mortality in achondroplastic individuals.
    • Sudden death and brain-stem compression were primary causes in young children (<4 years).
    • Cardiovascular deaths were significantly increased (SMR 5.2) in the 25-54 age group, often associated with spinal canal stenosis.

    Conclusions:

    • Bony abnormalities in achondroplasia, including foramen magnum and spinal canal stenosis, significantly impact mortality.
    • Increased mortality is observed across all ages, with distinct causes varying by age group.
    • Recommendations include efforts to minimize complications related to bony abnormalities.