Congenital abnormalities (also known as birth defects or congenital anomalies) are structural or functional abnormalities present at birth, regardless of whether they are detected immediately or later in life. These conditions can arise from genetic, environmental, or unknown factors and may affect any part of the body.
Types of Congenital Abnormalities
- Structural Abnormalities – Physical defects in body structure.
- Heart defects (e.g., ventricular septal defect, tetralogy of Fallot)
- Neural tube defects (e.g., spina bifida, anencephaly)
- Cleft lip/palate
- Limb abnormalities (e.g., clubfoot, polydactyly)
- Gastrointestinal defects (e.g., esophageal atresia, Hirschsprung disease)
- Chromosomal & Genetic Abnormalities – Caused by mutations or chromosomal imbalances.
- Down syndrome (Trisomy 21)
- Turner syndrome (45,X)
- Klinefelter syndrome (47,XXY)
- Phenylketonuria (PKU) (metabolic disorder)
- Cystic fibrosis (inherited disorder affecting lungs and digestion)
- Functional/Developmental Abnormalities – Affect how a body system works.
- Congenital hypothyroidism
- Sensory impairments (e.g., congenital deafness, blindness)
- Intellectual disabilities (e.g., Fragile X syndrome)
Causes of Congenital Abnormalities
- Genetic factors (inherited mutations, chromosomal abnormalities)
- Environmental factors (teratogens):
- Infections (e.g., rubella, Zika virus, syphilis)
- Drugs & medications (e.g., alcohol – Fetal Alcohol Syndrome, thalidomide, anticonvulsants)
- Radiation exposure
- Maternal health conditions (e.g., diabetes, obesity, folate deficiency)
- Unknown causes (~50% of cases)
Prevention & Management
- Prenatal care: Folic acid supplementation, vaccinations (e.g., rubella), avoiding teratogens.
- Prenatal screening: Ultrasound, amniocentesis, genetic testing (NIPT, karyotyping).
- Neonatal screening: Early detection of metabolic disorders (e.g., PKU, congenital hypothyroidism).
- Treatment: Surgery (e.g., for heart defects, cleft palate), medications, therapy (physical/speech)
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