Childhood diseases I Flashcards
Flattened nasal bridge + oral cavity malformations + bowing shins= ?
Congenital syphilis
What are anomalies?
Morphologic defects that are present at birth
What is the cause of most congential abnormalities? Percent?
Unknown (40-60%)
What percent of congenital malformations are multifactorial? Percent?
20-25%
What is the the most common malformation? Percent?
Clubfoot with CNS (25.7%)
What is the second most common malformation? Percent?
PDA (16.9%)
What is the third most common malformation? Percent?
VSD (11%)
What is the fourth most common malformation?Percent?
Cleft lip/palate (9.1%)
What is the clubfoot?
Internal rotation of a foot at the ankle
What is PDA?
Patent ductus arteriosus fails to close after birth.
recall DA shunts pulmonary blood to the aorta
What are VSDs?
Ventricular septum does not come up fully. Thus left ventricle can move to the right.
What is the cause of the cleft lip?
Incomplete closure of the pharynges
What is atresia?
Abnormal closure of a lumen–esophageal or rectal
What are the two major genetic diseases of childhood?
Down syndrome
CF
What is the most common chromosomal disorder?
Trisomy 21
What CA are Down syndrome patients susceptible to?
Leukemia (acute megakaryoblastic leukemia)
What happens to Down syndrome patients after age 40?
Neurodegenerative changes characteristic of Alzheimer’s
Why are Down pts susceptible to thyroid diseases?
Abnormal immune response
At what maternal age does Down syndrome probability increase?
at 35, much more at 40
What is the incidence of Down syndrome?
1 in 700
What is the cause of increased probability of having a Down syndrome child with increasing maternal age?
Meiotic nondisjunction
What is the Robertsonian translocation? What percent of down patients have this?
(14;21q), +21 (translocation produces extra bits of Cr21, but not a full chromosome)
4%
What is the Robersonian translocation? What percent of down patients have this?
(14;21q), +21 (translocation produces extra bits of Cr21, but not a full chromosome)
4%
What is the mosaic type of Down syndrome? What percent of down patients have this?
Mixture of some cells with an extra 21st chromosome, and another without
1%
What are the characteristics of Down syndrome pts? (3)
- Flattened nasal bridge
- Epicanthal folds on inner corner of eyes
- Palpebral fissures slant upward
What is the simian crease?
Single, transverse crease on the palm of the hand–can be seen in downs (or not)
What is the foot characteristic of Down syndrome?
Space between the first and second toes
What is the inheritance pattern of CF?
AR
What is the incidence of CF?
1 in 3200
What is the problem with CF?
Epithelial CFTR transporter, resulting in high salt [c] in exocrine glands
How do you diagnose CF?
Hypertonic sweat
What is the CFTR gene location?
7q 31.2
What is the most common mutation that leads to CF?
deletion of 3 nucleotides coding for F at 508 position
What causes a salty baby?
Cl cannot flow into ducts of sweat glands, thus Na cannot either.
How many different mutations give rise to CF?
over 800
What causes a salty baby?
Cl cannot flow into cells, thus Na cannot either.
What is the effect of CFTR mutation in mucus glands?
Cl cannot escape cells, thus Na and water flow inward at an increased rate.