1: Neurology + Development - Down's Syndrome, Cerebral Palsy, Status Epilepticus, Febrile Convlusions, Seizures, Seizure Disorders Flashcards
What is downs syndrome
Where there are three copies of chromosome 21 (Trisomy 21)
What is the most common chromosomal aberration
Downs Syndrome
What is the main risk factor for Down’s syndrome
Maternal Age
What is the risk of DS at maternal age 20y
1:1500
What is the risk of DS at maternal age 30y
1:800
What is the risk of DS at maternal age 40y
1:100
What is the risk of DS at maternal age 45y
1:50
What is the risk of DS at maternal age 50y
1:6
What is the most common cause of trisomy 21
Meiosis Non-Dysfunction
What is non-dysfunction
Failure of homologous chromosomes to separate during meiosis
Where does the majority of non-dysfunction occur
During meiosis I
What is the risk of recurrence in future pregnancies if DS is due to non-dysjunction
<1:100 if <35
What is a balanced robertsonian translocation
- Where the long arm of chromosome 14 combines with long arm of chromosome 21. And, short-arm is deleted
- Individuals possess only 45 chromosomes but have all the genetic material to give a normal phenotype
What is an unbalanced translocation
- Where individuals inherited one ‘balanced translocated’ chromosome and one normal chromosome
- This gives three copies of chromosome 46XY ± 21 ± t(21:14)
What % of DS is due to unbalanced translocation
5
What is mosaicism
Where there are two cell lines present. In DS, will be one normal cell line and one DS cell line. Phenotype depends on balance.
What are two risk factors for DS
- Maternal age
- First-degree relative with DS
How will a foetus with DS present on 10-13+6W scan
Raised nuchal translucency
What are the 4 heart structural abnormalities seen in DS and their frequency
- AVSD (40%)
- VSD (30%)
- TOF (5%)
- Patent ductus arteriosus (5%)
What are the 2 GI tract abnormalities seen on anomaly scan in foetus with DS
- Hyperechogenic bowel
- Duodenal atresia
What are the craniofacial dysmorphic features of a child with DS
Eyes:
Upward slanting
Large epicanthic folds
Brushfield spots
Nose:
Broad nose
Ears: Small round low-set ears
Mouth: small oral cavity, high arched palate
What are brushfield spots
aggregation of connective tissue in the peripheral iris
In the extremities, what are 5 features of DS
- Single palmar crease
- Sandal gap
- Increase risk inguinal hernia
- Increase risk umbilical hernia
- Atlanto-axial instability
What is the sandal gap
Increased gap between big toe and second toe
What are two GI tract features seen in neonates with DS
Hirschsprungs
Imperforate anus
What is the GU features seen in neonates with DS
Cryptochidism
What are the aesthetic features of an older child with DS
Short stature
Obese
What are cognitive features of a child with DS
Lower IQ
What are the haematological symptoms of a child with DS
ALL
What are the endocrine features in DS
Hypothyroidism
What are the GU features in an adult with DS
Subfertility in females
Infertility in males
What are the respiratory features of someone with DS
- Recurrent infections and hearing impairment: glue ear
- OSA
What are the long-term neurological symptoms of someone with DS
Increased risk of pre-mature Alzheimer’s disease
What are the neonatal developmental features of a baby with DS
- Hypotonia
- Developmental delay
What are the two main types of screening test used for DS
- Combined Test
2. Quadruple test
When is the combined test performed
10-13W+6
When is the quadruple test performed
15-20W
What are the four components of the combined test
- PAPP-A
- Nuchal Translucency
- serum bHCG
- Maternal Age
What do low levels of PAPP-A reflect
Poor Placentation
What is a low level of PAPP-A
<0.4
If a monochorionic multiple pregnancy how is the risk of DS calculated
Per pregnancy
If a dichorionic multiple pregnancy how is the risk of DS calculate
Per foetus
Explain what will happen at the end of screening
Mum is given a score of ‘high risk >1:150’ or low risk ‘<1:150’.
What are the two non-invasive pre-natal testing methods for DS
- Amniocentesis
- Chorionic Villus Sampling
What is SAFE
Checking karyotype of foetal blood cells in maternal blood
If SAFE test is positive what does this mean
It is still a screening test and would indicate need for diagnostic test
Who is the IONA test offered to for free
If high-risk of DS. More than 1:150.
If IONA test is positive what does this mean
It is still a screening test and would indicate need for diagnostic test
What are the two methods of diagnostic testing for DS
- Chorionic Villus Sampling
2. Amniocentesis
What gestation can chorionic villus sampling be performed
First trimester.
10-13W
Explain the procedure of CVS
Needle placed trans-abdominally to take trans-placental sample
What is performed on sample from CVS
- Karyotype (2d)
- FISH (3W)
What is the advantage of CVS
Within termination limits
What is the disadvantage of CVS
- 2%. miscarriage risk
- Infection risk
- Placental mosaicism
When can amniocentesis be performed
Second trimster 15-20W
Explain the procedure for amniocentesis
Needle placed through abdomen to take sample from baby.
What is performed on amniocentesis
- Karyotype (3W)
- FISH and PCR (3d)
What is the advantage of amniocentesis
Miscarriage rate 1% - lower than CVS
What is the disadvantage of amniocentesis
Miscarriage rate (1%)
What 4 post-natal tests re recommended for DS baby
- Karyotype
- ECHO
- Hip US
- Audiology
What is the average prognosis of DS
55y
What do the majority of people with DS develop
early-onset Alzhiemer’s disease
What is the aim of treatment for DS
Supportive. No curative treatment.
What should be offered to DS for management
- Paediatrician follow-up
- Physio to improve tone
What follow-up is recommended in DS patients
- Annual TFTs
- Audiology and Ophthalmology every 1-2Y
What is cerebral palsy
Chronic neurodevelopment disorder that presents with abnormalities in movement and posture that start early and continue through life
How can the aetiology of cerebral palsy be divided
Cerebral palsy is caused by repeated brain insult prior to 2-years. Its aetiology can be divided into antenatal, perinatal and postnatal.
What percentage of cerebral palsy is antenatal in origin
80%
What are three causes of antenatal cerebral palsy
- TORCH Infections
- Cerebral malformation
- Placental Insufficiency
What are the TORCH infections
Toxoplasmosis 'Other' Rubella CMV Herpes
What percentage of cerebral palsy is peri-natal in origin
10%
What causes peri-natal cerebral palsy
Birth asphyxia - resulting in hypoxic-ischaemic injury and encephalopathy
What percentage of cerebral palsy is post-natal in origin
10%
What causes post-natal cerebral palsy
- IV haemorrhage
- Trauma
- Kernicterus
- Meningitis
What are two risk factors for cerebral palsy
Low birth weight
Premature!
In which population is the incidence of cerebral palsy higher
Those born 22-27W
How is cerebral palsy categorised
It is categorised by the type of movements present into two main categories:
- Spastic CP
- Non-Spastic CP
What are the two categories of cerebral palsy
- Spastic Cerebral Palsy
2. Non-Spastic Cerebral Palsy
What percentage of cerebral palsy is spastic
70%
What percentage of cerebral palsy is non-spastic
30%
What are the two-types of non-spastic cerebral palsy
- Ataxic
2. Dyskinetic
What is dyskinetic non-spastic cerebral palsy
Presence of involuntary movements. Including choreoarthroid movements and dystonia
How does ataxic cerebral palsy present
Intention tremor
Poor balance
Poor co-ordination
How will individuals with spastic cerebral palsy present in general
- Hypotonic at birth until 6-12 months when they become spastic
what reflexes may remain in spastic cerebral palsy
Primitive reflexes remain
Upgoing Plantar Reflex
what type of gait may be present in cerebral palsy
- Tip toe walking
- Scissoring gait due to weakness in abductors
What are three complications of spastic cerebral palsy
- Hip dislocation
- Scoliosis
- Hearing and visual impairment
What are the three types of spastic cerebral palsy
- Hemiplegic
- Quadriplegic
- Diplegic
What is hemiplegic CP
Weakness in arm and leg on the same side
Are the arms of legs affected more in hemiplegic CP
Arms
How will the arms appear in hemiplegic spastic CP
- Hands in fists
- Pronated
- Hand preference before 12m
What is a classic indictor of hemiplegic CP and why
Hand preference before 12m. In hemiplegic CP, one side will be weak causing the infant to use the other side giving hand preference
How will legs present in hemiplegic CP
Tip toe walk
What is diplegic CP
When all four limbs are affected
Are legs or arms affected more in diplegic CP
Legs
What is quadriplegic CP
When arms and legs are affected
How will quadriplegic CP present early-on
Poor head control!!
What conditions is quadriplegic CP associated with
- Microcephaly
- Intellectual impairment
- Epilepsy
Explain abnormal involuntary movements in non-spastic CP
Worsen with stress and improve with sleep
What percentage of CP is dyskinetic
10%
How will tone present in dyskinetic CP
fluctuating tone leading to abnormal movements
What are three types of movement in dyskinetic CP
- Dystonia
- Chorea
- Athetosis
What is chorea
Non-Repetitive, sudden movements
What is dystonia
Contraction of agonist and antagonist muscles of the proximal limb
What is athetosis
Contraction of agonist and antagonist muscles of the distal limb
What percentage of CP is ataxic hypotonic
10%
How does ataxic hypotonic CP present
Ataxia Intention tremor Hypotonia Poor balance Un co-ordination
What are 7 problems associated with CP
- Epilepsy
- Intellectual disability
- Developmental motor delay
- ADHD
- Squint
- Feeding difficultly
- Joint contractures
Which type of CP is more associated with intellectual disability
Spastic
Why will children with CP struggle with feeding
Struggle with oro-motor co-ordination leading to gagging
What causes spastic CP
Damage to pyramidal tract. Damages GABAergic neurons, leading to hypertonia.
What causes dyskinetic CP
Damage to basal ganglia which controls initiation of movement. Disinhibiting movement
What causes ataxic CP
Damage to cerebellum - resulting in ataxia.
What is the term cerebral palsy used to describe
CP is used to describe the disability not the cause - therefore need to find underlying neurological insult.
What causes cerebral palsy
repetitive neurological insult before 2-years. Therefore investigation focuses on finding sources of insult
What is first-step in investigating CP
Detailed history to try and identify episodes of birth asphyxia and HIE
What imaging is used to investigate cause of CP in neonates
Cranial US
What can cranial US identify
HIE and structural abnormalities
What imaging is used in older children to identify CP
MRI
Explain aims of treatment in CP
Treatment is not curative - but aims to relieve symptoms
What is used to manage posture and movement in CP
Posture + Movement:
- Exercises
- Orthoses
- Wheelchair
- Management of spasticity
What can be used to treat spasticity in CP
- Botox of gastrocnemius = prevents toe walking
- Oral diazepam
- Oral/Intrathecal Baclofen
What is used to manage communication in CP
SALT referral
What is used to manage congnition in CP
Tailored Educational Program
Why is CP classified as non-progressive
As it does not get worse
Define status epileptics
- Seizure persisting beyond 30-minutes
- Or, recurrent seizures with no return to baseline between
What are 5 causes of status epileptics
- SOL
- Epilepsy
- Metabolite disturbances
- CNS Infection
- Febrile convulsion
- Head Injury
What is a risk factor for status epilepticus
Seizures persisting beyond 5 minutes
Why is status epileptics protocol started after 5-minutes
Seizures beyond 5 minutes have a significant risk of transforming into status epilepticus. Therefore risk is avoided by introducing treatment early.
How can status epilepticus be divided
- Convulsive
- Non-Convulsive
How is non-convulsive status epilepticus identified
EEG
What investigations are performed for status epilepticus
- Blood Glucose
- U+Es
- CRP/ESR
- FBC
- Toxicology screen
- CT
When should a CT scan be considered
Focal neurological signs or symptoms. Head trauma
How should status epilepticus be managed in general
A-E approach (Emergency)
How is status epilepticus managed in 0-5m
- ACTION - for seizure management.
- Call For Help
- IV Access
- 100% Oxygen
- Monitor glucose
How is status epilepticus managed in 5-15m
IV Lorazepam OR Rectal Diazepam
When is IV lorazepam given
If IV access obtained
What should be done at 15-20m if individual is still in status
Repeat dose of IV lorazepam or rectal diazepam (up to maximum of 4mg for lorazepam. Or, 10 for diazepam)
What is maximum dose of IV lorazepam
4mg
What is maximum dose of rectal diazepam
10mg
What medication is given 15-35 minutes if still in status
IV phenytoin
If individual is normally on phenytoin, but still not responding to lorazepam or diazepam, what should be given as an alternative
IV Phenobarbitone
If status epilepticus has not responded to lorazepam or second-line what is it called
Refractory
What should be done for refractory seizures
Contact ITU for admission
- Intubated
- Thiopentone given
- IV midazolam
EEG monitoring
What is thiopentone
Muscle relaxant
What is IV midazolam used for
Terminate seizure activity
Explain medications given in order for status epileptics
- IV lorazepam or Rectal diazepam
- Repeat dose IV lorazepam or rectal diazepam
- IV phenytoin (or If regularly on phenytoin, IV phenobarbitone)
What is the risk following status epilepticus in a child
High risk of entering respiratory arrest following status
What should be done to prevent children going into respiratory arrest following status epilepticus
- Oxygen
- Observe SpO2
- Recovery position
When may a LP be performed if required following a status
Wait for GCS > 9
What is a febrile convulsion
Single generalised tonic-clonic seizure lasting less than 15-minutes associated with a temperature >38.
In which age group do febrile convulsions occur
6m -5 years.
What is peak age for febrile convulsions
12-18 months
What are 5 risk factors for febrile convulsions
1. HHV6 Infection (Roseola Infantum) 2. Influenza virus 3. MMR vaccine 4. FH 5. Rapid rise in temperature
What are the three categories of febrile convulsions
- Simple Febrile Convulsion
- Complex Febrile Convulsion
- Convulsive Status Epilepticus
What are the 4 criteria for a simple febrile convulsion
- < 15m
- Generalised Tonic-Clonic
- Quick return to baseline
- No recurrence in 24h
What are three criteria for a complex febrile seizure
- Focal
- <15 minutes
- May recur in 24h
What is febrile status epileptics
Seizure persisting longer than 30-minutes
What are the three names of theories for aetiology of febrile convulsions
- Fever rises body temperature
- Fever causes hyperventilation
- Cytokine theory
Explain fever rises core body T theory
Fever increases core body T - increasing neuronal excitability
Explain fever causes hyperventilation theory
Fever increases RR, this causes respiratory alkalosis. Respiratory alkalosis leads to increased excitability of neurons
Explain fever, cytokine theory
Cytokines act on NMDA receptors increase excitability
Explain investigations for febrile convulsions
If simple, febrile convulsions may not need to be investigated
What investigations may be performed in febrile convulsions
FBC CRP Blood Glucose U+E Urinalysis Urine Culture LP EEG
When should children with febrile convulsions be admitted to paediatrics
- First presentation of febrile convulsion
- Complex febrile convulsions
- Under 18m with febrile convulsion
What is the three criteria for complex febrile convulsions
- <15m
- Focal neurological signs and symptoms
- May recurrent in 24h
What is first-line management for febrile convulsions
ACTION management
What is the ACTION approach
Assess situation Call for help Time Identity Over - once finished put in recovery position Never restrain their head
If a simple febrile convulsion lasting more than 5 minutes what should be done
Benzodiezapine rescues medication
What is given as benzodiezapine rescue medication
Buccal midazolam
Or, rectal diazepam
What dose of buccal midazolam is given if under 11 months
2.5mg
What dose of buccal midazolam is given if 1-4 years
5mg
What dose of buccal midazolam is given if 5-9 years
7.5mg
What is an alternative to buccal midazolam for febrile convulsions
Rectal diazepam
Aside from midazolam/diazepam what may be given in febrile convulsions
Anti-Paretics
What are criteria for admitting children with febrile convulsions
- <18m
- Complex febrile convulsion
- First presentation
Discuss long-term management of febrile convulsions
At start of fever parent’s may given paracetamol of wet flannel to cool the child.
Teach parents how to use benzodiezapine rescue pack
What have anti-pyretics NOT been shown to do
reduce recurrence of febrile convulsions
What is the risk of another seizure in febrile convulsions
1 in 3
Explain link between febrile convulsions and epilepsy
There are three risk factors for epilepsy:
- FH
- Complex febrile convulsion
- Background neurodevelopment issue
- If not factors = 2.5% risk
- Multiple factors = 50% risk
Define a seizure
Irregular electrical activity due to hyper-activity of neurons
What defines a neonate
28d
What are four causes of seizure in neonate
- Peri-natal Infection
- Peri-natal asphyxia
- Metabolite abnormalities
- Congenital Syndromes
What is the most common trigger of seizures in infants
Febrile convulsions
What age are febrile convulsions most common
12-18m
What are 5 causes of seizures in infants
- Malformaiton
- TBI
- Metabolic
- Fever
- Infection
What are three causes of seizures in adolescents
- TBI
- Illicit substance
- Encephalitis
What are 4 causes of seizure in young adults
- Alcohol withdrawal
- Illicit substances
- TBI
- Brain Tumours
What are the two main broad categories of seizures
- Generalised
2. Focal
What is a generalised seizure
Electrical seizure activity originates in bilateral networks
What is used to classify seizure type
International League Against Epilepsy
In ILAE classification, how are seizures first classified
- Generalised
2. Focal
If a focal seizure how are they first classified
- Awareness Impaired
2. Awareness Un-Impaired
How are focal seizures classified following awareness impaired/unimpaired
Motor
Non-Motor
What can focal seizures become
Focal Seizures can progress to bilateral tonic-clonic seizures
How are generalised seizures classified
- Motor = tonic clonic
2. Non-Motor = absence
What is a generalised motor seizure called
Tonic Clonic Seizure
What is a generalised non-motor seizure called
Absence Seizure
How are ‘other’ seizures classified
Into motor and non-motor
What are four types of generalised seizure
- Tonic-Clonic
- Myoclonic
- Atonic
- Absence
Explain clinical presentation of Tonic Clonic Seizures
- Pro-drome
- Individual first goes stiff and then limbs move symmetrically, bilaterally giving a rhythmic appearance.
- Individual may have tongue biting and incontinence during the seizure
What age group are myoclonic seizures more common
1-4 years
How do myoclonic seizures present
- LOC
- individual is thrown to the ground where they start violently jerking
What is best medication to manage myoclonic seizures
Sodium Valproate
How does atonic seizures present
Sudden loss of tone - causes person to fall to the ground
In which age-group is absence epilepsy more common
Childhood
What is absence epilepsy
Brief loss of consciousness for 5-20 seconds. Eyes may roll up. Individual is unaware
What are focal seizures
More commonly due to focal structural damage - occur on one hemisphere. Anatomical location indicates seizure symptoms.
What are the two types of focal seizure
- Consciousness unimpaired = simple partial seizure
2. Consciousness impaired = complex partial seizure
If a simple partial seizure where may it have arisen
- Frontal Lobe
- Parietal Lobe
- Occipital Lobe
How will a frontal focal seizure present
- Jacksonian March: Individual starts with twitching of the hand progresses to twitching of the face
- Head/Facial movements
- Todd’s paralysis
How will occipital focal seizure present
Flashers and Floaters in Vision
How will focal seizure of the parietal lobe present
Parasthesia
Where do complex focal seizures originate
Temporal Lobe
What % of focal seizures occur in temporal lobe
70-80%
What are 6 features of temporal lobe seizures
- Aura
- Deja Vu
- Jamais Vu
- Automatisms (Lip Smacking)
- Behavioural arrest
- Impaired consciousness
Child presents with lip smacking, where has the seizure likely originated
Temporal Lobe
What age does West Syndrome Occur
4-6 months
What is West Syndrome also referred to as
Infantile spasms
What gender is West Syndrome more common
Males
How does West Syndrome present
Head nodding followed by arm jerks for 3-30s
What is head nodding in West syndrome called
Salaam attack
What is a reflex-anoxic attack
Paraoxysmal self-limiting asystole triggered by pain or fear
How will a child present in reflex-anoxic attacks (6 Features)
- Pale
- Hypotonic
- Rigid
- Upward eye deviation
- Clonic
- Urinary incontinence
What investigation should be ordered if a reflex-anoxic attack is suspected
Vagal excitation tests during EEG and ECG monitoring
What age does panayiotopolous syndrome occur
5-years
What is panayiotopoulos syndrome
Benign Focal Seizure Disorder affecting ~5years. Occurs at night, Autonomic symptoms predominate, with eye deviation and vomiting. Seizures can last 30 minutes. Self-resolves within 2 years
Explain age-dependent epileptic encephalopathy
Starts with Otahara syndrome (Tonic spasms) Progresses to West Syndrome then Lenox-Gustalt.
These are age-specific syndrome reactions to a non-specific exogenous source
How does Rolandic epilepsy present
Parasthesia of unilateral face worse on waking
What is Rolandic epilepsy also known as
Benign epilepsy with centrotemporal spikes
What is associated with west syndrome
Low IQ (70%)
What is the management of west syndrome
- Prednisolone
2. Vigabatrin
What are bedside investigations following seizure
- Neurological Exam
- Cardiac Exam
What are blood investigations for seizure
- FBC (Infection)
- U+E (Metabolic)
- Serum Calcium
- Blood Glucose (Hypoglycaemia)
- Blood Gas ( Hypoxic)
Blood and Urine MC+S
What imaging may be ordered following paediatric seizure
MRI
ECG
EEG
When are three indications for MRI following a seizure
- Focal Seizure
- Children who develop epilepsy before age 2
- Seizures continue despite first-line treatment
When is an ECG performed following a seizure
All seizures
When is an EEG performed following a seizure
To SUPPORT diagnosis of epilepsy following second-seizure
What conservative management is offered for seizures
Advice:
- Avoid triggers
- Avoid dangerous situations such as bathing or swimming alone
What is used to manage epilepsy
anti-epileptic drugs
When should AEDs be used
following a second-seizure
What population should NOT be offered sodium valproate and why
young girls of reproductive age (from 8 years) due to high teratogenicity
What is first-line for focal seizures
lamotrigine or carbamezapine
How can you remember first-line for focal seizures
foCaL = has a C for carbamezapine and L for lamotrigine
What is first line for generalised TC seizures
Sodium valproate.
If a young female with generalised tonic-clonic seizures what medication should be given
Lamotrigine
How are absence seizures managed
Boys = Sodium Valproate Girls = Ethosuximide
How are myoclonic seizures managed
Boys = Sodum Valproate Girls = Levetiracetam
What are the two types of generalised epilepsy syndrome
Idiopathic epilepsy syndrome
Symptomatic epilepsy syndrome
Explain idiopathic epilepsy syndromes
Most common (25%). Children are generally healthy
Explain symptomatic/cryptogenic epilepsy syndromes
structural or metabolic abnormality. Cryptogenic means seizures of unknown origin. Generally this group respond poorly to anti-epileptics. Associated with developmental delay, cognitive impairment or motor impairment
What age does childhood absence epilepsy syndrome occur
6-7 years
Which gender is childhood absence epilepsy syndrome more common
Female
How will children appear in childhood absence epilepsy syndrome
Absence seizures where children may have lip smacking, eye fluttering
How will EEG appear in childhood absence epilepsy syndrome
3Hz spikes
What is used to treat childhood absence epilepsy syndrome
Ethosuximide
What age is juvenile myoclonic epilepsy syndrome more common
12-20
What is juvenile myoclonic epilepsy syndrome also referred to as
Janz Syndrome
What can cause west syndrome
- Hypoxic- Ischaemic Injury
- Perinatal infection
How will West Syndrome present
Sudden spasms involving flexion of the head (Salaam attack) and extension of the arms
What is used to manage West Syndrome
- Prednisolone
- Vigabatrin
What is west syndrome associated with
Neurodevelopment delay
What age does Lennox Gastaut Syndrome occur
3-5 years
Which gender is Lennox-Gastaut more common in
Males
What do 50% of children with Lennox - Gastaut have
West Syndrome
How will Lennox-Gastaut present clinically
- Frequent episodes of status epilepticus
- Atypical absence seizures
How will Lennox-Gastaut present on EEG
Slow-spikes
What is used to manage Lennox-Gastaut
Sodium Valproate
Ketogenic diet
What is Lennox Gastaut associated with
Neurodevelopment delay
What gene is mutated in Dravet syndrome
SC1A