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Dwarfism Biology
 

Dwarfism Biology

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    Dwarfism Biology Dwarfism Biology Presentation Transcript

    • Dwarfism • Dwarfism: an intellectual disability, Abnormally short stature. Some forms are hereditary. The Little People of America (LPA) define dwarfism as an adult height of 148 cm (4 feet 10 inches) or less. Also known as nanism. Dwarfism is now more correctly called short stature.
    • What Causes Dwarfism? •It is a genetic disorder, usually from inheritance •a random genetic mutation in either the father's sperm or the mother's egg •most common type, accounting for 70% of all cases of short stature, is called achondroplasia. •Dwarfism has other causes, including metabolic or hormonal disorders in infancy or childhood •There is more then 200 causes of dwarfism
    • incidence rate •Dwarfism is a very rare disease •Therefore it affects less then 200,000 people •Gene frequency is estimated to be 1/16,000 and 1/35,000 (ref). There are about 5,000 achondroplasts in the U.S.A. and 65,000 on Earth (Warkany, 1971). The prevalence rate for achondroplasia is between 0.5 and 1.5 in 10,000 births.
    • Signs and symptoms •Short stature •large head with frontal bossing, depressed nasal bridge, midfacial hypoplasia, narrow nasal passages, prognathism, and dental malocclusion •Generalized joint hypermobility, especially the knees •Short fingers and bowed legs
    • Complications -Large head of the affected infant may cause obstetrical problems and also creates an increased risk of intracranial bleeding during delivery (Hall et al, 1982). -Marked obstetrical difficulties secondary to very narrow pelvis of achondroplastic women -Neurological complications including, small foramen magnum, cervicomedullary junction compression causing sudden unexpected death in infants with achondroplasia (Pauli et al, 1984), apnea, communicating hydrocephalus, spinal stenosis, paraparesis, quadriparesis, and infantile hypotonia -Thoraco-lumbar gibbus -Osteoarthropathy of the knee joints
    • Associations & support groups •The Restricted Growth Association •Little People of America group •Association of Dwarfism
    • Worksited http://www.ibis-birthdefects.org/start/achondro.htm http://www.mayoclinic.com/health/dwarfism/DS01012/DSECTION=ca uses http://www.google.com/search?hl=en&q=asso ciations+to+help+with+dwarfism&aq=o&oq= http://www.kumc.edu/gec/support/dwarfism. html