Trisomy 13 (Patau Syndrome) Characteristics
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Questions and Answers

What is the primary mechanism responsible for the development of Trisomy 13?

  • Translocation of chromosomes
  • Mitotic nondisjunction
  • Meiotic nondisjunction (correct)
  • Abnormal fusion of prechordal mesoderm
  • What is the characteristic facial anomaly often seen in Trisomy 13?

  • High-set ears
  • Low-set, malformed ears (correct)
  • Bulbous nose with a long philtrum
  • Small eyes with a prominent forehead
  • What is the most common congenital heart defect seen in Trisomy 13?

  • Atrial septal defect
  • Patent foramen ovale
  • Tetralogy of Fallot
  • Ventricular septal defect (correct)
  • What is the incidence of Trisomy 13 in live births?

    <p>1:7,400</p> Signup and view all the answers

    What is the typical prognosis for infants with Trisomy 13?

    <p>Only approximately 11% of infants survive past 12 months of age</p> Signup and view all the answers

    What is the term for the congenital absence of skin, often seen in Trisomy 13?

    <p>Aplasia cutis congenita</p> Signup and view all the answers

    What is the term for the small orbits, which may be unilateral or bilateral, seen in Trisomy 13?

    <p>Microphthalmia</p> Signup and view all the answers

    What is the first trimester screening test used to detect Trisomy 13?

    <p>Ultrasound and maternal serum testing</p> Signup and view all the answers

    Study Notes

    Trisomy 13 (Patau Syndrome)

    Karyotype

    • Female: 47,XX,+13
    • Male: 47,XY,+13

    Incidence

    • Approximately 1 in 7,400 live births

    Pathogenesis

    • Meiotic nondisjunction
    • Abnormal fusion of prechordal mesoderm leading to midline defects

    Clinical Features

    Craniofacial Anomalies

    • Microcephaly
    • Holoprosencephaly
    • Characteristic facial anomalies
    • Cleft lip and palate
    • Low-set, malformed ears
    • Bulbous nose
    • Small chin

    Ocular Anomalies

    • Microphthalmia (small orbits) - unilateral or bilateral
    • Coloboma
    • Ocular hypotelorism

    Limb Anomalies

    • Polydactyly (primarily hexadactyly)
    • Flexed fingers

    Cardiovascular Anomalies

    • Congenital heart defects
    • Ventricular septal defect
    • Patent ductus arteriosis

    Skin Anomalies

    • Aplasia cutis congenita: congenital absence of skin (scalp lesions with a punched-out appearance)
    • Capillary hemangioma

    Other Anomalies

    • Rocker-bottom feet
    • Omphalocele
    • Visceral and genital anomalies (e.g., polycystic kidney disease)

    Diagnostics

    • Detected during first trimester screening with combined ultrasound and maternal serum testing
    • Decreased PAPP-A, increased nuchal translucency

    Prognosis

    • Infants usually die before the age of 1
    • Only approximately 11% of infants survive past 12 months of age

    Mnemonic

    • 7 Ps of Patau syndrome: holoprosencephaly, cleft lip and palate, polydactyly, pump disease (congenital heart disease), polycystic kidney disease, cutis aplasia

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    Description

    Test your knowledge on Trisomy 13, also known as Patau Syndrome, a rare genetic disorder caused by meiotic nondisjunction. Learn about its incidence, pathogenesis, clinical features, and characteristic physical anomalies. Identify the symptoms and understand the disorder.

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