Global developmental delay Flashcards
What are 3 features that may suggest neurodevelopmental concerns prenatally?
- Positive family history e.g. affected siblings or family members, ethnicity, e.g. Tay Sachs disease in Jewish parents
- Antenatal screening tests e.g. ultrasound including nuchal thickness, triple blood test or non-invasive prenatal testing - Down syndrome, neural tube defects e.g. spina bifida and hydrocephalus
- Amniocentesis for supected genetic disorders
What are 4 features that may suggest neurodevelopmental concerns perinatally?
- Following birth asphyxia/neonatal encephalopathy
- Preterm infants with intraventricular haemorrhage / periventricular leucomalacia, post-haemorrhagic hydrocephalus
- Dysmorphic and neurocutaneous features
- Abnormal neurological behaviour - tone, feeding, movement, seizures, visual inattention
What are 4 things in infancy that could suggest neurodevelopmental delay?
- Global developmental delay
- Delayed or asymmetric motor development
- Neurocutaneous and dysmorphic features (cataracts)
- Vision or hearing concerns by parents or after screening
What are 4 things in preschool age that could suggest neurodevelopmental delay?
- Speech and language delay
- Abnormal gait, clumsy motor skills
- Poor social communication skills
- Behaviour - stereotypical, overactivity, inattention
What are 6 things in school age that could suggest neurodevelopmental delay?
- Problems with balance and coordination
- Learning difficulties
- Attention control
- Hyperactivity
- Specific learning difficulties e.g. dyslexia, dyspraxia
- Social communication difficulties
What are 2 features that could suggest neurodevelopmental concerns at any age?
- Acquired brain injury e.g. after meningitis, head injury
- Loss of skills
When examining a child with possible developmental problems what are 4 key things to remember?
- Ask the parent what child’s abilities are by starting at a level below what child of that age expected to be able to do
- use toys: cubes, ball, car, doll, pencil, paper, pegboard, miniature toys, picture book (9)
- assess to a short level above what they appear able to do, in order to establish ceiling of skill for each developmental area
- at end, should be able to describe what child able to do and what cannot do. what is within normal range and what is outside
What are 9 clinical things that may guide investigation for development?
- Patterns of growth: height, weight, head circumference with centile plotting
- Dysmorphic features: face, limbs, body proportions, cardiac, genitalia
- Skin: neurocutaneous stigmata, injuries, cleanliness
- Central nervous system: posture/symmetry, wasting, tone and power, reflexes, clonus, plantar responses, cranial nerves
- Cardiovascular
- Visual and ocular
- Hearing
- Patterns of mobility, dexterity, hand dominance, communication and social skills, general behaviour
- Cognition
What is the definition of delay?
Slow acquisition of all skills (global delay) or of one particular field or area of skill (specific delay), particularly in relation to developmental problems in the 0-5 year age group
What is the definition of learning difficulty?
Used in relation to children of school age and may be cognitive, physical, both or relate to specific functional skills
What is the definition of a developmental disorder?
Maldevelopment of a skill
What is the definition of developmental impairment?
Loss of abnormality of physiological function or anatomical structure
What is the definition of developmental disability?
Any restriction or lack of ability due to the impairment
What is the definition of developmental disadvantage?
Results from the disability, and limits or prevents fulfilment of a normal role. Situationally specific; child with learning disability may by a good skier or enjoy swimming
What is the difference between learning difficulty and learning disability?
Difficulty is used particularly in an educational context
What are 3 categories of types of abnormal development?
- Slow but steady
- Plateau effect
- Showing regression: acute (e.g. following acute brain injury with slow recovery but not to normal levels) or slow regression (neurodegenerative disorders)
What are 4 degrees of severity of abnormal development?
- mild
- moderate
- severe
- profound
What happens for children with abnormal development as they grow older?
Gap between their abilities and what is normal widens with age
What is another name for global developmental delay?
Early developmental impairment
When does global developmental delay usually become apparent?
First 2 years of life
What are 4 groups of conditions that can cause abnormal development and learning difficulty?
- Prenatal
- Perinatal
- Postnatal
- Other
What are 6 types of prenatal causes of abnormal developmental and learning difficulty?
- Genetic
- Cerebrovascular
- Metabolic
- Teratogenic
- Congenital infection: rubella, cytomegalovirus, toxoplasmosis, HIV
- Neurocutaneous syndromes: tuberous sclerosis, neurofibromatosis, Sturge-Weber, Ito syndrome
What are 7 genetic prenatal causes
Chromosome/DNA disorders
- Down syndrome
- Fragile X syndrome
- Chromosome microdeletions or duplications
Cerebral dysgensis
- microcephaly
- absent corpus callosum
- hydrocephalus
- neuronal migration disorder
What is a key prenatal cerebrovascular cause of abnormal development and learning difficulty?
Stroke - haemorrhagic or ischaemic
What are 2 examples of prenatal metabolic causes of abnormal development and learning difficulty?
Hypothyroidism, phenylketonuria
What are 2 examples of prenatal teratogenic causes of abnormal development and learning difficulty?
Alcohol and drug abuse
What are 4 examples of congenital infections that can cause abnormal development and learning difficulty?
- Cytomegalovirus
- Rubella
- Toxoplasmosis
- HIV
What are 4 examples of neurocutaneous syndromes that can cause abnormal development and learning difficult prenatally?
- Tuberous sclerosis
- Neurofibromatosis
- Sturge-Weber
- Ito syndrome
What are 3 perinatal causes of abnormal development/ learning difficulty?
- Extreme prematurity: intraventricular haemorrhage/ periventricular leucomalacia
- Birth asphyxia - hypoxic-ischaemic encephalopathy
- Metabolic: symptomatic hypoglycaemia, hyperbilirubinaemia
What are 6 groups of postnatal causes of abnormal development and learning difficulty?
- Infection - meningitis, encephalitis
- Anoxia - suffocation, near drowning, seizures
- Trauma - head injury: accidental or non-accidental
- Metabolic - hypoglycaemia, inborn errors of metabolism
- Cerebrovascular - stroke
- Nutritional deficiency - maternal deficiency (breast fed), food intolerances, restrictions
What are 2 postnatal infective causes of abnormal development and learning difficulty?
- Meningitis
- Encephalitis
What are 3 examples of causes of anoxia postnatally that can cause abnormal development and learning difficulty?
- Suffocation
- Near drowning
- Seizures
What are 2 examples of metabolic postnatal causes of abnormal development and learning difficulty?
- Hypoglycaemia
- Inborn errors of metabolism
What is a cerebrovascular postnatal cause of abnormal development and learning difficulty?
Stroke
What are 3 examples of causes of nutritional deficiencies that can cause abnormal development and learning difficulty postnatally?
- Maternal deficiency if breast fed
- Food intolerances
- Restrictions
What are 4 ‘other’ causes of abnormal development and learning difficulty (outside prenatal/perinatal/postnatal)?
- Unknown - 25%
- Chronic illness
- Physical abuse
- Emotional neglect
What are 7 groups of investigations or assessment to consider for developmental delay?
- Cytogenetic: comparative genomic hybridzation microarray or chromosome karyotype. Fragile X analysis
- Metabolic: TFTs, LFTs, bone chemistry, U+Es, plasma amino acids, blood film, CK, blood lactate, very long-chain fatty acids, ammonia, etc. etc.
- Infection: congenital infection screen for CMV etc.
- Imaging: cranial US in newborn, CT and MRI brain scans. Skeletal survey, bone age
- Neurophysiology: EEG for seizures, can be diagnostic for some neurological disorders and syndromes. Nerve conduction studies, EMG, visual evoked potentials, electroretinogram
- Histopathology/ histochemistry: nerve, skin and muscle biopsy
- Other: hearing, vision, clinical genetics, cognitive and behavioural assessment, therapy assessment, child psychiatry, dietician, nursery/ school reports
What is the pathophysiology of Down syndrome?
- Trisomy 21
- 95% due to non-disjunction (47 XY or XX, +21)
- 5% due to Robertsonian translocation, with 21q attaching to chromosome 14 (46XY or XX, t(14q21q)
What is the incidence of Down syndrome?
Affects 1/100 births by age 40
What are 6 groups of symptoms of Down syndrome?
- Facial appearance
- Hands and feet
- Musculoskeletal - hypotonia, flexible ligaments
- Associated problems - cardiac, GI
- Later in life: short stature, learning difficulties, visual/hearing problems
- Other diseases
What are 8 facial features of Down syndrome?
- Round face
- Flat occiput
- Short neck
- Flat nose
- Upslant eyes
- Small ears
- Small mouth
- Protruding tongue
What are 3 hands and feet features of Down syndrome?
- Single palmar crease
- Incurved 5th finger
- Sandal gap
What are 2 musculoskeletal problems in Down syndrome?
- Hypotonia
- Flexible ligaments
What are 4 problems commonly associated with Down syndrome (cardiac and GI)?
- Atrioventricular septal defect
- Ventricular septal defect
- Duodenal atresia
- Hirschprung’s disease
What are 4 problems associated with Down syndrome later in life?
- Delay motor milestones (global delay)
- Short stature
- Moderate to severe learning difficulties
- Vision/hearing problems