Meningitis.txt

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kavinashah
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66842
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Meningitis.txt
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2011-02-16 18:08:05
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  1. what are the 3 most common causes of bacterial meningitis?
    • neisseria meningitides
    • streptococcus pneumoniae
    • haeomophilus influenzae
  2. which investigation can give an early clue of which one of the 3 primary pathogens is causative?
    gram stain can differentiate between the 3
  3. how do you define a neonate?
    birth to 28 days (4weeks)
  4. what are the commonest causes of neonatal meningitis?
    • Group B streptococcus
    • E coli, other coliforms
    • Listeria monocytogenes
  5. which organism would cause a more chronic meningitis?
    TB meningitis
  6. what are the 3 main causes of meningo-encephalitis?
    • spirochaetes:
    • leptospira
    • Treponema pallidum (syphilis)
    • borrelia burgdorferi (lyme)
  7. what are the commonest causes of viral meningitis? which group and name 3 in that group
    • ENTEROVIRUSES
    • 1. echoviruses
    • 2. coxsackie virus A & B
    • 3. poliovirus
  8. which herpes virus is more assoc with enceph and which with meningitis?
    • HSV1: encephalitis
    • HSV2: meningitis
  9. which virus that causes parotid gland problems can also cause enceph?
    paramyxovirus that causes mumps can become complicated and cause enceph
  10. which viruses cause meningo-encephalitis? (4)
    • HSV1
    • arbovirus - tropical
    • rabies virus (fatal)
    • MMR virus
  11. which is the main fungus meningitis? who? give full name of fungus
    • cryptococus neoformans
    • HIV immunocompromised
  12. name 3 causes of protozoal meningitis?
    • amoebe:
    • naegleria
    • acanthamoeba
    • other: toxoplasma gondii
  13. what has acanthamoeba been associated with?
    • keratitis
    • meningitis
    • assoc with contact lens fluids (when weren't sterile)
  14. what does normal CSF look like?
    clear
  15. what is normal range for CSF lymphocytes ?
    0-5/mm3
  16. how much protein is in normal CSF?
    0.15-0.4 g/l
  17. how much glucose?
    2.2-3.3 mmol/l
  18. how much glucose in CSF should there be in relation to blood glucose?
    CSF glucose should be 50% or more of blood glucose
  19. in a neonate how many PMN are normal?
    up to 15-30 polymorphs as BBB is not fully established so get leakage of WBC into neonatal CSF
  20. what does the CSF look like in bacterial meningitis? what is change in WBC?
    • turbid
    • increase in polymorphs 100-2000
  21. in peripheral blood, what is rough ratio of RBC to WBC?
    1 WBC to 500 RBC
  22. in CSF if there were 15,000 RBC and 60 white cells is that normal proportion or something worrying?
    • abnormal
    • should be 30
  23. what happens to protein levels in bacterial meningitis and why?
    • increases 0.5-3.0
    • bacterial proteins
  24. what happens to glucose in bacterial meningitis?
    • falls precipitously
    • because bacteria are using the glucose as energy source for multiplication
  25. what is the other name for viral meningitis?
    asceptic meningitis
  26. what does the CSF look like in viral meningitis? what is change in WBC?
    • clear or slightly turbid
    • mainly lymphocytes 15-500
    • but polymorphs may predominate in ACUTE STAGE
  27. what happens to protein levels in viral meningitis and why?
    • not that high as active replication inside the CSF is NOT happening
    • but there are some viral proteins liberated into the CSF so marginally higher 0.5-1
  28. what happens to glucose in viral meningitis?
    • as virals are intracellular organisms they use the cell machinery and so don't use up glucose
    • glucose levels stay normal (2.2-3.3)
  29. what is the differential for viral meningitis? 2
    • 1. partially treated bacterial meningitis
    • 2. brain abscess
  30. what does the CSF look like in TB meningitis? what is change in WBC?
    • CSF: clear, slightly turbid, fibrin clots in CSF
    • cells: mainly lymphocytes, also some polymorphs
  31. what Ix would you want if suspect TB meningitis?
    • auramine stain
    • suspect on: duration of illness, travel, ethnic origin
  32. what is the main thing to remember in TB meningitis when looking at CSF?
    • protein is very HIGH as organism has a protein rich coat
    • 1.0-6.0
  33. what happens to glucose in TB meningitis?
    falls as organism uses it to grow
  34. what is differential for TB meningitis?
    • 1. brain abscess
    • 2. cryptococcal meningitis
  35. what is special about the crying in a baby with meningitis?
    • incessant
    • doesn't stop when you pick it up (whereas would if just hungry)
    • when pick up, jiggles head and irritate membranes more so crying gets worse when pick up
  36. on examination, what are signs in a baby to pick up for meningitis?
    • fever
    • rash
    • bulging fontanelles
    • crying when head movement
  37. why would a child get conjunctival haemorrhage in meningitis? what do you need to do?
    • earliest phenomenon of DIC in a meningococcal infection
    • check for non-blanching rash: leaking of blood from small blood vessels in skin, also happening in conjunctiva
  38. what are the 2 peaks of meningococcal meningitis? why?
    • 5-6 months
    • 15-25 years age - university
  39. how would you describe meningococcus on gram stain and microscopy?
    meningococcus: gram -ve, intracellular diplococci
  40. how does meningococucs spread?
    • airborne transmission
    • close contact
  41. when are the 2 peaks of meningococcal meningitis and why?
    • at 5-6months: creche or nursery
    • 15-25 university: crowding of students in closed spaces, military barracks, large events - rebreathing of air in closed spaces
  42. how do some meningogoccal meningitis present initially?
    • flu like illness due to
    • viral flu which encourages the organism with colonises airways to penetrate through an inflamed mucosa directly thought cribriform plate.
    • (or via bloodstream)
  43. which blood tests do you do in suspected meningitis?
    • FBC: WCC count, platelets
    • CRP
    • coagulation screen: DIC in meningococcal and pneumococcal
    • blood cultures
    • give abx then LP
  44. what are the contraindications to LP?
    • 1. raised ICP
    • 2. rash - rapidly spreading purport as shows DIC and means low platelets
    • 3. abnormal coagulation screen
    • 4. seizures
    • 5. severe respiratory compromise - must secure airway first
  45. when doing an LP, what 2 things should be notes?
    • 1. opening pressure
    • 2. when hold CSF up to light - clear or turbid with pus?
  46. what are the signs of raised ICP?
    • 1. neonate: bulging fontanelles
    • 2. cushing's reflex: bradycardia with hypertension
    • 3. fluctuating GCS
    • 4. focal neurology eg hemiparesis
    • 5. poorly responsive pupils, papilloedema
  47. what is single most important factor that predisposes to complications in meningitis?
    • delay in giving first antibiotics esp in meningococcal disease because endotoxin released is bad - stimulate whole TNF cytokine cascade
    • causes SIRS, DIC, shock
    • one arm antibiotic, one arm take bloods. see that is given yourself
  48. if GP comes to see child at home, what abx they give? why?
    • im benpen
    • cheap so if goes out of date doesn't matter
    • need this one as will treat neisseria meningitides which is the worse one as rapidly evolves and get DIC, endotoxic shock which want to prevent
  49. what is empirical Rx of meningitis in hospital? why?
    • ceftriaxone iv 2g bd
    • catch all - treat the top 3 pathogens: meningococcal, pneumococcal and h.influenzae
  50. what do you have to do with all meningitis cases in terms of public health?
    • all meningitis is statutory notifiable to public health physician
    • in UK: CCDC: consultants in communicable disease control
    • treating doctor & microbiologists must notify them.
    • give them a list of contacts
  51. how do you define a contact?
    • close household sleeping and kissing contacts
    • eg child - mum, dad, siblings
    • all kids in creche
    • school class
    • halls of residence -: everyone in that residence
    • hospital staff: mouth to mouth or if intubating had significant aerosol exposure in face
    • give prophylaxis to primary contact, not contact of contact
  52. what is the prophylaxis for meningitis?
    • adult: single 500mg tablet ciprofloxacin
    • children: rifampicin bd for 2 days - warn secretions may turn orange, don't worry
    • pregnant: im ceftriaxone, not cipro in preg
  53. how quickly do you have to give prophylaxis?
    incubation period 5-7 days
  54. how many groups of meningococcus are there?
    • A, B, C
    • X, Y, Z
    • W135, 29E
  55. which is commonest strain of meningococcus in western world?
    B
  56. which was 2nd commonest strain of meningocooccus?
    men c
  57. which strain of meningococcus does vaccine cover?
    Men C: given as part of universe immunisation of childhood but still need prophylaxis if come across meningitis as no vaccine for men B
  58. where are men A&C found?
    tropics: asia, india, africa near equator
  59. whose decision is it to re-open school?
    with CCDC
  60. what is the other vaccine given as meningitis prophylaxis?
    • quadrivalent vaccine: A C Y W135
    • travel vaccine: pilgrimage to Haj, north india…elective
  61. what is a complication of meningococcal meningitis related to rash
    bleeding under skin (ecchymosis when purport coalesce), all tissue superior to that is dead. complications of meningococcal diseases - no blood supply distal to bleeding point so get black digits, black toes - gangrene - not treated quick enough - loss of limb
  62. what are the risk factors for pneumococcal meningitis?
    • 1. age
    • 2. splenectomy
    • 3. smoking
    • 4. alcohol: nutrition is poor, immune status poor
  63. what is the difference in management of meningococcal and pneumococcal meningitis?
    • no contact tracing
    • no prophylaxis in pneumococcal
  64. which cause of meningitis do you add steroids to the management and when?
    • only with strep pneumo
    • add with 1st dose of abx or within 4 hours
  65. what is a complication of strep pneumo?
    deafness
  66. what would strep pneumo look like on culture?
    clear area around the bug, which is the capsule
  67. what are predisposing factors to neonatal sepsis?
    • 1. prolonged labour
    • 2. difficult delivery
    • 3. PROM > 24 hours
    • 4. maternal pyrexia
  68. what is management of presumed GBS sepsis?
    • benzyl penicillin
    • add gentamicin for anti microbial synergy
  69. how to prevent GBS sepsis in neonate?
    • screening based: USA not UK. low vaginal swab between 35-38wk gestation look for GBS. if found then get iv ben pen across labour
    • risk based strategy: hx of previous baby with GBS sepsis (she is colonised with organism), maternal UTI in this pregnancy with GBS (indicates she's colonised), prolonged ROM, instrumental, maternal pyrexia, prolonged labour, vaginal swab which found GBS
    • iv ben pen THROUGHOUT LABOUR as want to saturate fetal tissue with it as it passes through a colonised birth canal
  70. why does UK follow risk based approach?
    • 1. new first time hx of anaphylaxis presents when give ben pen to labour.
    • 2. medicalises labour
  71. what does GBS look like on microscopy?
    gram +ve cocci in long chains
  72. blood agar plate for GBS?
    clear beta haemolysis
  73. if based on CSF results it looks like viral meningitis, what is your immediate management?
    • still give ceftriaxone until you know more - until senior dr has come
    • send for bacterial and viral examination - PCR
    • commonest virus: enteroviruses
  74. what happens in a cell culture infected with ENTEROVIRUS?
    • vacuolation of cells
    • disruption of smooth monolayer
  75. why should children not get herpes virus MENINGITIS?
    • because that is much more related to HSV2 which is acquired through genital infection
    • don't expect children to get genital infection as usually sexually transmitted
  76. what is a child likely to get in the brain if they have a coldsore and why?
    HSV 1 encephalitis (meningo-encephalitis) as HSV 1 causes oral infections
  77. which antiviral treats enteroviral group?
    none
  78. if suspect HSV1 or 2 what to give?
    ceftriaxone + aciclovir
  79. how would you differentiate meningitis from meningo-encephalitis?
    • expertise
    • EEG, CT scan
  80. what is more common viral or bacterial meningitis?
    viral meningitis more common - but less serious, less sequelae assoc with it
  81. what are CSF changes in encephalitis?
    • not consistent
    • cells - pleomorphic
  82. what is encephalitis?
    inflammation of the brain due to an infection
  83. what is the commonest cause of encephalitis?
    viral
  84. how do viruses gain access to CNS?
    • through blood
    • or travel within nerve cells (neurones)
  85. what are the 2 main manifestations of encephalitis?
    • primary
    • secondary
  86. what is primary encephalitis?
    first exposure to a virus results in the virus directly affecting the brain and spinal cord
  87. what is secondary encephalitis?
    • virus first infects another part of the body, lies LATENT for a while
    • and secondarily affects CNS when REACTIVATED
  88. What is the commonest cause of acute viral encephalitis?
    herpes simplex virus
  89. which other viruses cause encephalitis and how are they transmitted?
    • arbovirus: arthropod borne viruses transmitted by mosquitoes, ticks
    • rabies virus: certain animal bites/saliva
  90. when can you get secondary encephalitis in children?
    after common childhood viral infections eg measles, mumps, rubella, chickpox or EBV
  91. what are the symptoms of most cases of encephalitis?
    • headache
    • irritability
    • lethargy
  92. what happens in severe encephalitis?
    • seizures
    • N&V
    • sudden fever
    • altered levels of consciousness
  93. what is the most common method of diagnosis for viral encephalitis?
    CSF or blood nucleic acid - PCR
  94. how do you confirm diagnosis of viral encephalitis?
    viral culture and antigen detection
  95. on CT or MRI what does abscess look like?
    encapsulated, well demarcated lesion
  96. what are the 4 sources of brain abscesses?
    • 1. nasopharyngeal infection: otitis media, mastoiditis, sinusitis
    • 2. blood stream
    • 3. dental abscess (prev lung abscess)
    • 4. direct to brain due to trauma eg fracture or surgery
  97. what are the most likely organisms of brain abscesses and why?
    • reflect oro-nasopharyngeal flora
    • aerobic G+ve cocci: strep milleri, staph aureus
    • anaerobic G-ve: bacteroides, fusobacterium
  98. name 4 organisms that immunocompromised patients are likely to get causing a brain abscess
    • protozoan parasite: toxoplasma gondii
    • fungi: aspergillus, candida,
    • norcardia
  99. what are 4 symptoms of brain abscesses?
    • fever
    • headaches
    • focal seizures
    • altered mental status
  100. what 2 investigations are needed for diagnosis of brain abscess?
    • image: MRI or CT
    • diagnostic aspiration of the pus: microbiological smear and culture analysis
  101. what is the empirical treatment of brain abscess?
    • ceftriaxone and metronidazole
    • or chloramphenicol if allergic to ceftriaxone or if pen resistant organism
  102. how do you treat staphylococcal brain abscesses?
    chloramphenicol or linezolid

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