Infections and immunity conditions Flashcards
Presentation Kawasaki disease
Conjunctivitis without discharge
Fever 39C+ and >5days
Strawberry tongue and cracked lips
Peeling skin on palms of hands and soles of feet
Macular erythematous rash on main part of body and genitals
What is a serious complication of Kawasaki?
Coronary artery aneurysm
Treatment kawasaki?
Ig and aspirin
When do measles symptoms come on in relation to exposure?
10-14 days post exposure
Measles presentation
- cough/coryza
- fever (can be as high as 40 and last a week)
- conjunctivitis
- Irritability
- Koplik’s spots
- Morbilliform rash starting behind ears and spreading down whole body to hands and feet last. Starts red and turns dark brown (‘staining’)
How long does measles take to resolve?
about 3w
Complication measles?
Encephalitis
Management measles?
Notifiable disease
Stay away from suscpetible- off work for at lest 4 days after rash onset, preferably until fully recovered
Supportive Rx
Safety net for uncontrollable fever, SOB, convulsions or reduced consciousness
Presentation infectious mononucleosis
Photophobia
Throat sore and red
Lymphadenopathy
Cough
Fatigue, malaise, loss appetite, headache
Tonsils red, swollen, white patches
Splenomegaly, abdo pain
Nausea and vomiting
Occasionally jaundice
Fever, chills, aches
infectious mononucleosis aka
Ebv
glandular fever
what blood cells are seen on a blood film in infectious mononucleosis?
Peripheral leucocytosis with atypical lymphocytes (large, irregular nuclei)
How do you diagnose infectious mononucleosis?
Serology (monospot test)
What treatment must you avoid in infectious mononucleosis? Why?
Amoxicillin causes mac pap rash
What pathogens cause periorbital cellulitis?
Staphs, strep pneumoniae, strep pyogenes, milleri
How is periorbital cellulitis caused?
Paranasal sinus infection
Eyelid injury/infection
Dental injury/infection
External ocular infection
Management periorbital cellulitis
Unless very mild, admit for:
CT
ENT and ophthal opinion
Antibiotics
±surgery
periorbital cellulitis presentation?
Inflammation around orbit
Decreased eye mobility
Fever
periorbital cellulitis complications
Spread to meninges or cavernous sinus, form abscess
Can = blindness due to pressure on the optic nerve/thrombosis of optic nerve vessels
In any irritable child with unexplained fever you should consider what?
Meningitis
When is meningitis most common?
Neonatal
which viruses can cause meningitis?
Mumps
Coxsackie
Echovirus
HSV
Poliomyelitis (if unvaccinated)
Viral meningitis is preceded by…?
Pharyngitis or gi upset
Are complications more common in viral or bacterial meningitis?
Bacterial
Is viral or bacterial meningitis generally better?
Viral is milder and self-resolving usually.
Treatment for viral meningitis?
Generally supportive. If severe HSV/EBV/VZV consider aciclovir
Bacterial causes of meningitis?
Neisseria meningitidis
Strep pneumoniae
H. influenza type B
Group B strep
E. coli and listeria
TB
Meningococcal meningitis is caused by what?
Neisseria meningitidis
Pneumococcal meningitis is caused by what?
Strep pneumoniae
Group B strep, E. coli and listeria are a more common cause of meningitis in which group?
Neonates
TB is a more common cause of meningitis in which group?
Immunocompromised
As well as the cardinal symptoms, how might a child with meningitis present?
drowsy, vacant
irritable
high pitched cry
occas. convulsions
What are early signs of bacterial meningitis?
Headache
Fever
Leg pains
Cold hands and feet
Abnormal skin colour
What are later signs of bacterial meningitis
Meningism
Reduced GCS, coma
Seizures ±focal CNS signs
Petechial rash (IF MENINGOCOCCAL)
Shock (cap refill, DIC, hypotension)
Bulging fontanelle in infants
Are Kernig’s and Brudzinski’s sign reliable in young infants?
No
What signs could you find that the meningitis is caused by HZV?
Shingles or chicken pox
What signs could you find that the meningitis is caused by HSV
Cold sore
What signs could you find that the meningitis is caused by HIV
lymphadenopathy, dermatitis, candidiasis, uveitis
What signs could you find that the meningitis is caused by leptospirosis
Bleeding ± red eye
What signs could you find that the meningitis is caused by mumps
parotid swelling
What signs could you find that the meningitis is caused by glandular fever
sore throat
jaundice
nodes
What signs could you find that the meningitis is caused by immune deficiency
Splenectomy scar
Differentials for meningitis?
Malaria
Encephalitis
Septicaemia
SAH
Dengue
Tetanus
Tonsillitis and otitis media may mimic neck stiffness
In primary care if you come across a non-blanching rash and suspect meningitis what could you do?
Give benzylpenicillin IV, or IM if no vein- as proximally as possible into a warm limb. Before admitting to secondary care.
Don’t do if there is no rash, unless urgent transfer to secondary care not possible.
If someone is penicillin allergic should you still give BenPen in susp meningitis in primary care?
If the allergy is just a rash yes, if anaphylactic no
What does of benpen should you give for susp meningitis in primary care?
<1y- 300mg
1-9y- 600mg
> 10y- 1200mg
When does meningitis become septicaemia?
When features of shock
What should initial management of bac meningitis (without features of shock or raised ICP) be?
ABC- fluids, glucose
Blood cultures
Senior help
LP <1hr (as long as no shock, no rash and no raised ICP)
Abx IV after LP (unless LP delayed by >1hr)
Dex 10mg IV
What should initial management of bac meningitis (without features of shock but with signs of raised ICP) be?
ICU help
ABx IV (often ceftriaxone 2g/12h)
Dex 10mg/6h IV
Support airway, fluids
Nurse at 30 degrees
Delay LP until stable
What should initial management of bac meningitis with signs of shock be?
ICU help
Blood cultures
IV ABx
Airway support, maybe pre-emptive intubation
Fluid resus/inotropes/vasopressors. Aim for MAP >70mmHg, urine output >30ml/h
Delay LP until stable
What is later management for bacterial meningitis (±shock, raised ICP)
Careful monitoring
Adjust abx based on sensitivities
Fluid resus/maintenance
Inform PHE
Kissing contacts prophylaxis
What is used for bac meningitis contacts prophylaxis?
Rifampicin/ciprofloxacin
Why is dex given in bac meningitis?
helps meningism
Should you do LP before antibiotics?
Only if:
- no signs of shock
- no rash
- no raised ICP
- can get within 1h
What other investigations can you do in bac meningitis
U&E, FBC (decreased WCC could = immunocompromised), LFT, glucose, coag
Throat swabs for bacteria and virology
CXR
HIV/TB test?
How common are meningitis complications
1/3 to 1/2 survivors are left with at least one permanent problem. More common in bac.
What are the complications of meningitis?
Total/partial hearing loss (usually get hearing test after a few weeks)
Recurrent seizures (epilepsy)
Problems with memory and concentration
Co-ord/movement/balance problems
Vision loss (total or partial)
Learning dfficulties and behav probs.
Loss of limbs
Bone and joint probs- e.g. arthritis
Kidney probs
How often is bac meningitis fatal?
10%
What is waterhouse-friderichsen syndrome?
A complication of meningococcal meningitis
Endotoxins –> coagulopathy –> haemorrhagic necrosis of the adrenal glands.
DIC
Acute adrenal gland failure
Resp failure
> 40% mortality
How do you treat waterhouse-friderichsen syndrome?
Abx
Fluid and electrolyte management
Coagulopathy treatment
CSF opening pressure is seen initially on the LP, and the CSF should then be sent for?
MC&S
Protein
Lactate
Glucose
Virology/PCR
What is the appearance of CSF in:
Normal
Bacterial
Viral
Fungal
TB
Normal clear and colourless
Bac cloudy and turbid
Viral clear
Fungal clear or cloudy
TB opaque, fibrin web if left
What is the opening pressure in different types of meningitis
Always raised, might be normal in viral
What is the WCC in CSF in the different types of meningitis?
Always raised, but to different degrees. Polymorphs are seen in bacterial or early viral/TB
Normal 0-5
Bac: >100
Viral 50-1000
Fungal 10-500
TB 10-1000
What is glucose content of CSF in the different types of meningitis?
Low, apart from in viral where it is normal
What is protein content of CSF in the different types of meningitis?
Always high
what would signs of raised ICP be in meningitis?
papilloedema, FND, seizures, GCS =12
Meningococcal septicaemia with meningitis is when…?
Purpuric non-blanching rash with neck stiffness
What is the treatment of infectious mononucleosis?
Supportive
What does infectious mononucleosis put you at risk of in future?
Lymphoma, gastric and nasopharyngeal cancer
Causes of purpura can be divided into which two groups?
Non thrombocytopenic and thrombocytopenic
What are the non thrombocytopenic causes of purpura?
HSP
Sepsis (meningococcal or viral)
Trauma
Scurvy
What are the thrombocytopenic causes of purpura?
ITP
Leukaemia
DIC
Aplastic anaemia
HUS
TTP (rare in children)
Purpura <3mm is called ?
Petechiae
Purpura >1cm is called ?
eccymosis