Teratology · 20 week prenatal ultrasound showed a hole in the heart ... Achondroplasia-FGFR3....
Transcript of Teratology · 20 week prenatal ultrasound showed a hole in the heart ... Achondroplasia-FGFR3....
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Teratology
Wendy Chung, MD PhD
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Mrs. B
• 30 year old woman comes to you because her
20 week prenatal ultrasound showed a hole in
the heart
• Patient and her husband have many questions:
– What caused this birth defect?
– Was it caused by the glass of wine she had before
she found out she was pregnant?
– Will there be other problems for this child?
– If they have other children, what is the risk of
recurrence?
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Teratology
• The study of abnormal development in
embryos and the causes of congenital
malformations or birth defects
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Birth Defects
• Observed in 3% of newborns
• Observed in another 3% of children later
• Account for 20% of perinatal deaths
• May or may not be outwardly visible
• Etiology: genetic and environmental
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65%-75%
Multifactorial or unknown
20%-25%
Genetic
Environmental
Intrauterine infections 3%
Maternal metabolic disorders 4%
Environmental chemicals 4%
Drugs and medications <1%
Ionizing radiation 1%-2%
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Major and Minor Anomalies
• Major anomalies: life/health threatening
• Minor anomalies: cosmetic
– May be seen in 14% of newborns
• The greater the number of minor anomalies, the greater the likelihood of a major anomaly
• Certain minor anomalies suggest specific major anomalies
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Down Syndrome
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Turner Syndrome
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Trisomy 13
• Midline defects (cleft lip and cleft palate)
• Central nervous system malformations
• Micro-ophthalmia
• Congenital heart disease
• Poor growth
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Trisomy 18
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Mrs. B
• Extensive ultrasound examination does
not identify other major anomalies
• Can minor anomalies be excluded?
• An amniocentesis is performed and is
normal
• Are genetic etiologies excluded?
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Inborn Errors of Metabolism
Causing Birth Defects
• Smith Lemli Opitz
• Congenital disorders of glycosylation
• Fatty acid oxidation disorders
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Single genes cause developmental
disorders
• PAX6: aniridia
• NEUROD1: pancreatic agenesis
• TTF1: thyroid agenesis
• NKX2.5: congenital heart disease
• ZIC3: holoprosencephaly
• Doublecortin: lissencephaly
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Achondroplasia-FGFR3
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Teratogens
• A chemical, infectious agent, physical condition, or deficiency that, on fetal exposure, can alter fetal morphology or subsequent function
• Teratogenicity depends upon the ability of the agent to cross the placenta
• The embryo is most susceptible to teratogenic agents during periods of rapid differentiation
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How are agents determined to be
teratogenic ?
• Anecdotal data in humans
• Data from animal studies
• For many drugs there are no definitive
data, so we recommend avoiding the use
of any medications possible during early
pregnancy
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Effect of Exposure Depends on
Timing
• All or none effect early
• Effect of organogenesis during embryonic
development
• Effect on size and function during fetal
development
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Nicotine
• IUGR
• Premature delivery
• Neurocognitive development
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Fetal Alcohol Syndrome
• Characteristic facial features
• Congenital heart disease
• Growth deficiency
• Behavioral/neurocognitive deficits
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Fetal Alcohol Syndrome
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Mrs. B
• Do you believe her fetus’ congenital heart
disease was caused by the glass of wine
she drank two weeks after conception?
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Tetraclycine
• Yellow/brown teeth
• Decreased bone growth
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Fetal Hydantoin Syndrome
• Caused by the anti-epileptic phenytoin
• Intrauterine growth retardation
• Microcephaly, mental retardation
• Distal phalangeal hypoplasia
• Specific facial features
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Retinoic acid
• Extremely teratogenic in the first five
weeks of gestation
• Craniofacial dysmorphisms
• Cleft palate
• Thymic aplasia
• Neural tube defects
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Thalidomide Syndrome
• Critical exposure is
24-36 days of
gestation
• Limbs
• Ears
• Cardiac
• GU anomalies
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Congenital Rubella (German
measles)
Cataracts, congenital heart disease, deafness
Effects are most severe within the first 6 weeks
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Congenital CMV
• Most common infection
• Spontaneous termination
• Intrauterine growth retardation
• Micromelia
• Chorioretinitis, blindness
• Microcephaly
• Cerebral calcifications, mental retardation
• Hepatosplenomegaly
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Ionizing Radiation
• Affects brain development at 10-18 weeks
of gestation at HIGH dose
• No evidence of effect of exposure
associated with typical diagnostic studies
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Maternal Hyperglycemia
• Congenital heart disease
• Renal, gastrointestinal, and central
nervous system malformations such as
neural tube defects
• Tight glycemic control starting prior to
conception is critical
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Babies of Mothers with PKU
• Mental retardation
• Low birth weight
• Congenital heart disease
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Mechanical forces can act as
teratogens
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Threshold Effect-Multifactorial
Examples: cleft lip, cleft palate, congenital heart disease, neural tube defects
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Mrs. B
• After birth, the newborn examination is
unremarkable
• The baby’s congenital heart disease is repaired
• At age three, the child is growing well and has
met all his milestones
• What caused his congenital heart disease?
• What is the risk of recurrence for a future
sibling?