Title: A Diabetic Male with AMS, Fever, and Hallucinations
1A Diabetic Male with AMS, Fever, and
Hallucinations
2Edward P. Sloan, MD, MPHAssociate
ProfessorDepartment of Emergency
MedicineUniversity of Illinois College of
MedicineChicago, IL
3Attending PhysicianEmergency
MedicineUniversity of Illinois HospitalOur
Lady of the Resurrection HospitalChicago, IL
4EMS Presentation
- 51 year old 0028 CFD EMS call for AMS
- Per family, high temp, flu-like symptoms
- Fever and hallucinations
- Hot, flushed, diaphoretic, O x 1
- VS 140/P, HR 120, RR 30
- Glucose 300
- Hx DM, HTN
- Recent viral illness
5ED Presentation
- August 2002, Illinois, 101 AM
- ED Presentation non-verbal, moaning
- Temp 102.2
- Viral Sx, N/V/D for 2 days
- Taking NSAIDs, refused PMD admit
- Responds to verbal, moans Help me.
6ED History
- ED Presentation non-verbal, moaning
- Temp 102.2
- Viral Sx, N/V/D for 2 days
- Taking NSAIDs, refused PMD admit
- Responds to verbal, moans Help me.
- No drugs or EtOH history
- Hx psoriasis
7ED Physical Exam
- Agitated, confused, combative, diaphoretic
- Pupils 2-3 mm, non-reactive airway OK
- Neck supple, no thyromegaly
- Cardiopulmonary tachycardia, tachypnea
- Abdomen non-tender
- Neuro CN grossly normal, no motor weakness,
tremor, intermittent nystagmus on central gaze - Skin old psoriasis, no new rash
8Clinical Questions
- What are the differential diagnoses?
- What are the etiologies?
- What tests must be performed?
- What therapies must be provided?
- What consultations are required?
- What outcome is likely?
9Lumbar Puncture
- Are there settings in which a lumbar puncture is
NOT to be performed? - Why?
- What are they?
10Meningitis Rx
- What is the optimal initial treatment strategy
for the management of presumed meningitis? - Why?
- What microbes are we treating?
11Encephalitis Rx
- What is the optimal initial treatment strategy
for the management of presumed encephalitis? - When should we empirically give acyclovir?
- What clinical or lumbar puncture findings suggest
the need for acyclovir?
12ED Management
- DDx Viral Sx, AMS
- R/o encephalitis, meningitis, sepsis
- Need to R/o West Nile Virus (Illinois)
- 115 Haldol, ativan
- 125 RSI with etomidate, pavulon, sux
- 440 Ceftriaxone 2 gr IV
- 455 Acyclovir 1 gr IV over 1 hour
13ED Diagnostics
- WBC 11,900 Hb 16.1
- Glu 313, Bicarb 25, chem ok
- 7.33 / 39 / 79 / 22 / 97
- CXR no clear infiltrate
- EKG sinus tach
- UA no UTI
- CT no lesions
- LP Unable x 2
14Consultations
- Neuro consult LP under fluoro, EEG
- ID consult
- R/o septic shock, resp failure
- R/o staph, given psoriasis
- R/o pneumococcal pneumonia
- R/o meningitis
- R/o toxic or metabolic encephalopathy
- Add vancomycin, obtain 2-D echo
15Hospital Course
- LP by neurosurgery
- 20 WBC, 20 RBC, glu 137, protein 32
- ID viral synd, R/o aseptic meningitis
- Day 3 Possible sub-endocardial AMI
- Day 3 Seizure, rx with fosphenytoin
- Rocephin changed to cefipime, levaquin
- Day 9 More responsive, temp to 102.6
- Day 10 Maculopapular rash
16Hospital Course
- EEG Non-specific diffuse slowing
- ECHO LV dysfunction
- Blood cultures negative
- Repeat CT maxillary sinus fluid
- PCR negative for herpes simplex virus
- Tests for systemic vasculitides negative
- Ab for myeloperoxidase
- Ab for proteinase-3
17Hospital Course
- Legionella Ag in urine negative
- Mycoplasm antibody titre negatvie
- Chlamydia pneumoniae IgG, IgA positive
- HIV Ab negative
- Day 11 West Nile Arbovirus (CSF)
18Patient Outcome
- PM R Consult Comprehensive rehab
- Pt extubated, improved neurologically
- Pt able to understand plan
- Discharge on day 26
- nursing home/rehab care
- able to speak, ambulate
- beginning to meet needs
- Seen in ED by same EM MD, doing well
19Fever, AMS Differential Dx
- Encephalitis
- Meningitis
- Meningoencephalitis
- Encephalomyelitis
- Sepsis
20Viral Encephalitis Etiologies
- Arboviruses mosquitoes, ticks
- Herpes viruses
- Herpes simplex
- Epstein-Barr
- CMV
- Varicella zoster
- Measles virus
21Encephalitis Pathophysiology
- Brain inflammation
- Usually caused by a viral etiology
- Focal, multi-focal, or diffuse
- Cerebral edema, hemorrhage, neuronal death
22Encephalitis Pathophysiology
- Blood borne CNS infection
- Diffuse encephalitis
- Transmitted thru other tissue
- Focal infection
- DNA or RNA viruses
23Arbovirus Encephalitis
- Mosquitoes or ticks (vectors)
- Vector-transmitted infection
- Mosquitoes
- 10 encephalitis rate if infected
- 150 to 3000 cases per year
- Ticks
- Rocky Mountain spotted fever
- Non-US Russian encephalitis
24Herpes Virus Encephalitis
- Able to lie dormant and reactivate
- HSV causes 10-20 of all cases
- 2 per 1,000,000 persons per year
- Usually HSV-1 from oral herpes
- Children, both HSV-1 and 2
- Only treatable cause of encephalitis
25Varicella Encephalitis
- Bad if related to chicken pox
- Adults and children
- In zoster, less severe unless immunocompromised
- Both types are rare
26Epstein-Barr Encephalitis
- Related to mononucleosis
- Fatigue, sore throat, HA, fever
- 1 encephalitis rate
- Usually mild
27CMV Encephalitis
- 5-10 complication rate
- In HIV patients, 50 complicated
- Significant mortality
28Other Encephalitis Causes
- Rabies
- Severe, fatal
- 16 cases between 1980-91 8 US
- Measles, influenza
- Adenoviruses
- 30 mortality rate if encephalitis
- Symptoms of meningitis, coma
- Parasites raccoons, toxoplasmosis
29What is ADEM?
- Acute disseminated encephalomyelitis
- Non-infectious encephalitis
- 2-3 weeks after a viral illness
- 1/3 of encephalitis cases
- Varicella, URIs are common causes
- Autoimmune reaction, white matter
- Myelin sheath damage, as in MS
30Arbovirus Encephalitis
- Eastern equine
- Western Equine
- St Louis
- California
- Japanese B
- West Nile
31Arbovirus Encephalitis Sx
- St Louis West Nile common in US
- Less than 1 cause CNS symptoms
- Sx 2-14 days post-exposure
- Fever, HA, N/V, lethargy
- West Nile Virus
- Maculopapular rash, morbilliform rash
- Loss of muscle tone and weakness
32Arbovirus Motor Sx
- Motor disorders common
- Severe general weakness
- Ataxia, voluntary motor problems
- Tremor, partial paralysis
- Dysphagia, Brocas aphasia
- Hearing and visual symptoms
33Encephalitis Sx
- Sudden onset
- Meningismus
- Stupor, coma
- Seizures, partial paralysis
- Confusion, psychosis
- Speech, memory symptoms
34Encephalitis Diagnosis
- Find treatable etiologies
- CT no changes early
- MRI early HSV changes detectable
- EEG temporal lobe HSV changes
- LP elevated WBCs and protein
- Labs
- Leukocytosis, LFTs, coags, chem, tox
- Viral cultures
35Encephalitis Serum Ab Tests
- Virus only at 2-4 days (too early)
- Serum Ab titres
- Low early levels
- 4-fold increase in convalescent tires
- Obtained 3-5 weeks after sx onset
- PCR will replicate virus DNA
- Quick results (hours)
- Sensitivity equal to viral culture
36Ruling Out Viral Meningitis
- Self limited
- Headache, photosensitivity
- Stiff neck
- Fever, N/V, fatigue also common
- Confusion, psychosis not seen
- Exclude mycoplasma, legionnella
37Treating Viral Encephalitis
- Antibiotics for presumed meningitis
- Acyclovir for presumed HSV Dx
- Steroids?
- Supportive therapies
- Seizure Rx
- Sedation
- Airway control
- Pain and fever meds
38Viral Encephalitis Anti-virals
- Acyclovir for presumed HSV, HZ
- Foscarnet (Foscavir)
- When resistant to Acyclovir
- If adverse reaction to Acyclovir
- Foscarnet or gancyclovir in CMV
- Ribavirin (Virazole)
39Encephalitis Pt Outcome
- 25 relapse rate in HSV disease
- ? Due to relapse or new viral illness
- Poorer outcome with
- Age 55
- Immunocompromise
- Pre-existing neurological problem
- Specific virus virulence
- Coma does not bad outcome
40Encephalitis Pt Outcome
- Outcome related to mental status at the time
anti-viral Rx initiated - Early use is warranted
- Long-term sequelae can occur
- Motor, speech, cognitive
- Emotional, personality changes
- Sensory problems (vision, hearing)
41Encephalitis Vaccines
- Measles vaccine
- Varicella vaccine
- Rabies vaccine, immunoglobulin
- Japanese encephalitis vaccine
- Experimental West Nile Virus vaccine
42West Nile Virus Encephalitis
- Mosquito-borne, expanding area
- 1/5 mild febrile illness
- 1/150 meningitis, encephalitis
- Advanced age is greatest risk factor
- Clues as to likely WNV infection
- Infected birds or cases identified
- Late summer
- Profound muscle weakness
43West Nile Virus Encephalitis
- IgM Ab testing via Elisa useful
- Test of serum or CSF
- False positives can occur
- Other flaviviral infections (dengue)
- Prior vaccination (yellow fever)
- Rapid reporting is essential
44West Nile Ecology
45West Nile Ecology
46U.S. counties reporting any WNV-infected birds in
1999 (N 28 counties)
47U.S. counties reporting any WNV-infected birds in
2000 (N 136 counties)
48U.S. counties reporting any WNV-infected birds in
2001 (N 328 counties)
49U.S. Counties Reporting WNV-Positive Dead Birds,
2002
15,745 birds 1,888 counties 42 states D.C.
502003
51June 2004
52West Nile Virus
53WNV Encephalitis Diagnosis
- Leukocytosis, lymphocytopenia
- Hyponatremia
- CSF pleocytosis, lymphocytes
- Elevated CSF protein
- Normal CT
- MR enhanced leptomeninges or periventricular
areas
54Encephalitis MR Findings
- Inflamed portion of the temporal lobe, involving
the uncus and adjacent parahippocampal gyrus, in
brightest white on MR.
55WNV Antibody Diagnosis
- ELISA detection of WNV IgM
- 95 CSF WNV IgM rate
- IgM does note cross BBB
- CSF IgM suggests CNS infection
- 90 remain positive if tested within 8 days on
symptom onset
56WNV Antibody Diagnosis
- Asymptomatic pts common
- In endemic area, IgM could be high
- Acute, convalescent titres
- Viral culture low yield
- Real-time PCR
- 55 CSF positive, 10 serum
57WNV Encephalitis Pt Outcome
- Overall, 4-14 mortality
- Age 70, 15-29 mortality
- DM, immunosuppression also predict worse outcome
58WNV Encephalitis Prevention
- Reducing the of vector mosquitoes
- Draining standing water sites
- Methoprene spraying (no maturation)
- Adulticides (organophos, pyrethroids)
- Prevent mosquito bites
- 50 DEET, 10 DEET in children
- Permethrin to clothing, fabrics
- Citronella (less effective)
59Key Learning Points
- AMS, fever, weakness encephalitis
- Know clues for West Nile virus
- Early use of ceftriaxone, acyclovir
- Supportive care essential
- Consultation for best diagnostics
- Reportable public health disease
- Prevention is best approach
60Key Learning Points
- No LP if there is a herniation risk
- Abnormal posturing, exam
- Abnormal CT
- Ceftriaxone 2 gr, vancomycin 1 gr
- LP in encephalitis WBCs, lymphocytes, no
bacteria - Acyclovir with any encephalitis risk
61Questions?
www.FERNE.org edsloan_at_uic.edu 312 413 7490
destin_ sloan_ams_wnv_2004