Paediatrics 2 Flashcards
Rashes & infectious diseases Endocrine
When does the rash associated with measles appear?
3-4 after symptom onset
School exclusion criteria for measles
4 days after rash onset
Measles causative organism
RNA paramyxovirus
Measles clinical manifestations
Maculopapular rash behind ears - spreads and becomes confluent
Koplik spots
Conjunctivitis
Irritable
Measles investigations
< 3 days: PCR for measles mRNA
> 3 days: IgM/IgG antibodies
Post-measles complications
Otitis media
Pneumonia
Myocarditis
Encephalitis
Subacute sclerosing panencephalitis - 5-10 years later
Dawson disease
Subacute sclerosing panencephalitis
School exclusion criteria for measles
4 days after rash onset
Rubella causative organism
Togavirus - rubivirus
School exclusion criteria for rubella
5 days after rash onset
Rubella clinical manifestations
Maculopapular rash on face - spreads to body
Lymphadenopathy
Forchheimer spots
Congenital rubella syndrome
Sensorineural deafness
Cataracts
PDA
Complications post-rubella
Thrombocytopaenia
Encephalitis
Myocarditis
Arthritis of small joints
When is rubella vaccinated against?
MMR:
12-13 months
2-3 years old
Rubella incubation period
14-21 days
Rubella investigations
PCR
IgM antibodies
Erythema infectiosum: alternative names
5th disease
Slapped cheek syndrome
Describe the rash associated with erythema infectiosum
On face (slapped cheeks)
Spreads to trunk and limbs (lacy)
Erythema infectiosum causative organism
Parvovirus B19
Erythema infectiosum school exclusion criteria
No school exclusion
Roseola infantum symptoms
Extremely high fever
to
Rash on trunk to extremities
Febrile convulsions
Roseola infantum epidemiology
6 months - 2 years
Roseola infantum causative organism
HHV6
Roseola infantum complications
Aseptic meningitis
Hepatitis
Roseola infantum school exclusion criteria
No school exclusion
Hand, foot and mouth disease causative organisms
Coxsackie A16 virus
Enterovirus 71
Hand, foot and mouth disease school exclusion
No school exclusion
Hand, foot and mouth disease complications
Viral meningitis
Encephalitis
Herpangina
Coxsackie A affecting mouth only
Why should ibuprofen be avoided in children with chickenpox?
Increase risk of necrotising enterocolitis
Chicken pox rash
Itchy, starting on head/trunk and spreads
Macular -> papular and vesicular
Congenital varicella syndrome
Limb atrophy
Ocular defects
Neurological defects
Chicken pox complications
Secondary bacterial infection of lesions – B-haemolytic Group A Strep
Encephalitis
Disseminated haemorrhagic chickenpox
Pneumonia
Chicken pox school exclusion criteria
Until lesions have crusted over
Meningitis investigations
Blood cultures
LP
Meningitis antibiotics
< 3 months: amoxicilln (listeria) + cefotaxime
> 3 months: cefotaxime / ceftriaxone
Meningitis prophylactic antibiotics
1st: Ciprofloxacin single dose
2nd: Rifampicin 2 days
Indication for benzylpenicllin for meningitis
Menogococcal meningitis
Non-blanching rash
Most common complication after meningitis
Sensorineural hearing loss
Cause of purpura/petechiae
Dermal capillary micro thrombi that rapidly lead to haemorrhagic skin necrosis
Endotoxin released by bacteria which induced oedema formation and capillary thrombosis with extravasation of blood into interstitial space
Close contact
Same household during 7 days before onset of illness
Anyone in direct contact with patient’s oral secretions
Waterhouse-Friedrichsen syndrome
Adrenal gland failure which can occur after meningitis
HSP pathophysiology
IgA mediated small vessel vasculitis
HSP clinical manifestations
After viral URTI
Purpural rash
Abdominal pain
Joint pain
Haematuria +/- proteinuria (nephritis)
Describe the rash associated with HSP
Purpural, non-blanching
Buttocks, back, legs, trunk spared
HSP management
Usually self-limiting
NSAIDs can be given for arthalgia
Steroids can be used
2 causes of desquamating rash
Scarlet fever
Kawasaki disease
Diagnostic critieria for Kawasaki disease.
Fever (>38.5) for > 5 days and at least 4 of:
- Conjunctivitis – bilateral (spares limbus)
- Rash – non-vesicular
- Cervical lymphadenopathy
- Strawberry tongue / cracked lips
- Hands & feet – swollen
Kawasaki disease management
High dose oral aspirin
IV immunoglobulin
Investigation of complications after Kawasaki disease
Echocardiogram for coronary artery aneurysm
Describe the conjunctivitis seen in Kawasaki disease
Bilateral
Spared limbus
Kawasaki disease complications
Coronary artery aneurysm
Reye syndrome
Pathophysiology of coronary artery aneurysm after Kawasaki disease
Fibrin deposited on blood vessel wall
Can’t gently stress
Bulges form ->
Coronary aneurysm
Reye syndrome aetiology + pathophysiology
Associated with aspirin use in children
Due to mitochondrial dysfunction
Reye syndrome features
After a viral infection / aspirin use
Non-inflammatory encephalopathy - slurred speech, lethargy
Fatty degeneration of liver - abnormal LFTs
Cerebral oedema - raised ICP
Reye syndrome diagnosis
Liver biopsy
Scarlet fever causative organism
Group A streptococci
Usually strep pyogenes
Scarlet fever school exclusion criteria
Return 24 hours after starting antibiotics
Scarlet fever: describe the rash
Neck to trunk & limbs
Fine punctuate erythema surrounding area around mouth
Sandpaper texture
Desquamation after 1 week
Scarlet fever clinical manifestations
Fever
Malaise
Strawberry tongue - red with white bits
Tonsilitis
Scarlet fever investigations
Throat swab
Increased anti streptolysin O (ASO)
Scarlet fever management
Give Abx before results of throat swab
Oral penicillin 10 days
Alternative azithromycin
Notifiable disease
Return to school 24 hours after Abx
Peak age of presentation of scarlet fever
4 years
Scarlet fever complications
Rheumatic fever - 20 days later
Otitis media
Acute glomerulonephritis
PANDAS
Mumps causative organism
RNA paramyxovirus
Mumps clinical manifestations
Parotitis (unilateral then bilateral in 70%)
Fever, malaise, muscular pain
Mumps school exclusion criteria
5 days after onset of swollen glands
Mumps complications
Orchitis 1 in 3
Viral meningitis 1 in 4
Hearing loss 1 in 25
Pancreatitis 1 in 25
Encephalitis 1 in 1000
Vaccines in the 6-in-1 vaccine
Polio
Whooping cough
Influenzae (HiB)
Tetanus
Hep B
Diphtheria
[DT, double P, double HB]
Whooping cough causative organism
Gram -ve Bordetella pertussis
Whooping cough school exclusion criteria
48 hours after starting antibiotics
Or 3 weeks from symptom onset
Whooping cough management
Azithromycin or clarithromycin
Only if cough within 3 weeks of start (otherwise supportive)
Also for household contacts
Vaccine for women 16-32 weeks pregnant
Whooping cough diagnostic criteria
Cough > 14 days and 1 of:
Paroxysmal cough
Inspiratory whoop
Post-tussive vomiting
Apnoeic attacks in young infants
Why is erythromycin not used for whooping cough?
Associated with hypertrophic pyloric stenosis
Threadworms causative organism
Enterobius vermicularis
Threadworms infection symptoms
Anal & vulval itching
Visible white worms in faeces
90% are asymptomatic
Threadworms investigation
Microscopy - sellotape to perianal area
Usually treated empirically
Threadworms school exclusion criteria
No school exclusion
Threadworms management
Single dose oral mebendazole for entire household > 6 months + hygiene advice
Contraindication to mebendazole for threadworms
< 6 months old
Contraindication to mebendazole for threadworms
< 6 months old
Steroids escalation
Hydrocortisone
Clobetasone
Betamethasone
Mometasone
Clobetasol
Eczema presentation in different ages
Infants: trunk and face
Younger children: extensor surfaces
Older children: flexor surfaces
Eczema management
1st: Simple emollients
2nd: Topical steroids
3rd: Immunosuppressants, topical calcineurin inhibitors
Eczema herpeticum
Dermatological emergency
Eczema infected with HSV
Acyclovir
Pityriasis rosea features
Herald patch - single pink scaly patch
Self-limiting
Head lice organism + management + diagnosis
Pediculus capitum
1st line: wet combing / malathion
No school exclusion
Fine tooth combing of wet / dry hair
Management of urticaria
Hives
Antihistamines +/- steroids
Usually self limiting
Impetigo appearance + management (treatment and school exclusion)
‘Golden crusted’ lesions arouns mouth
If well: benzoyl/hydrogen peroxide 1% cream
If signs of infection: fusidic acid or mupirocin
If systemically unwell: oral flucloxacillin (or erythromycin)
School exclusion:
Until lesions are crusted and healed, or 48 hours
after commencing antibiotic treatment
Impetigo causative organism
Staph aureus
Infective mononucleosis causative organism + diagnosis
EBV
FBC or Paul Bunnell/Monospot test +ve
Pityriasis versicolor causative organism
Malassezia furfur
Pityriasis versicolor appearance + treatment
Hypopigmentation patches (more noticeable after suntan)
Antifungals e.g. ketoconazole shampoo
2nd: itraconazole + send scrapings for diagnosis
Scabies causative organism + appearance
Sarcoptes scabei
Tracks and burrowing between finger webs
Scabies management
Whole family
1st: Permethrin cream 8-12 hours
Repeat 1 week later
2nd: malathion
Ivermectin for crusted scabies
School exclusion until treatment complete
Molluscum contagiosum management
Self-limiting + emollients
DKA investigations
Acidosis: pH < 7.3 & bicarbonate < 15mmol/L
Hyperglycaemia > 11mmol/L (unless known diabetic)
Ketonaemia - blood ketones > 3 mmol/L
Electrolytes
DKA severity by pH
pH < 7.1 – severe DKA (10% dehydration)
pH < 7.2 – moderate DKA (5% dehydration)
pH < 7.3 – mild DKA (5% dehydration)
DKA management
Fluid resuscitation – 0.9% NaCl – over 48 hours (+ bolus - do not subtract if shocked)
Insulin infusion – 0.1 units/kg/h
Potassium replacement and cardiac monitoring
DKA complications
Cerebral oedema
Hypokalaemia
Hypoglycaemia
Aspiration pneumonia
Death
DKA: how does cerebral oedema present?
Headache
Agitation
Low HR + higher BP
Decreased consciousness
Pupillary inequality or dilation
DKA: management of cerebral oedema
Hypertonic saline
Or mannitol
Restrict fluid to half of maintenance rates
Guthrie test: which conditions are screened for?
Congenital hypothyroidism
Sickle cell anaemia
Cystic fibrosis
Glutaric aciduria
Homocystinuria
Isovaleric aciduria
Phenylketonuria
Maple syrup urine disease
MCAD
Congenital hypothyroidism clinical manifestations
Puffy face
Macroglossia
Goitre
Hypotonia
Constipation
Prolonged jaundice
Feeding problems
Umbilical hernia
Congenital hypothyroidism - which type of bilirubinaemia is seen?
Unconjugated hyperbilirubinaemia
3 sub types of CAH in order of prevalence
21-hydroxylase deficiency
11-beta hydroxylase deficiency
17-hydroxylase deficiency
Mode of inheritance of CAH
Autosomal recessive
Action of 21-hydroxylase enzyme
Converts 17α-hydroxyprogesterone to 11-deoxycortisol in glucocorticoid pathway
Converts progesterone to 11-deoxycorticosterone in the mineralocorticoid pathway
% chance of 2 homozygous recessive parents for CAH 21-hydroxylase deficiency having a child with ambiguous genitalia?
1/8
Breakdown:
1/4 chance of CAH
1/2 chance of XX child
1/4 x 1/2 = 1/8
Clinical manifestations of 21-hydroxylase deficiency + gene affected
Ambiguous genitalia (XX) or precocious puberty (XY)
Salt-wasting
CY212A2 gene mutation