TTHM 11.3 (4/22/15) Contemporary Issues Conf
Infectious Diseases in EM
8a ~ Global Health & Malaria (Polhemus)
97 Countries c major transmission, 584K deaths per year, Anopheles mosquito…
Sporozoites, Liver parasite phase, merozoites, blood phase… (protozoan dsx)
- falciparum is “the malaria that kills”, parasitemia 1.3% low at <2%…
Artesunate & Malarone (Atovaquone/Proguanil) Rx… P.vivax (was “the weak malaria”)… changed to chloroquine Rx…
- knowlesii case report not caught by typical malarial quad screen antigen PCR, an “emerging 5th infection” First discovered 1931 & was actually used for a time to induce fevers to trreat syphilis!?! Knowlesii found primarily in Malaysia, but also other southeast Asia. Higher mortality, like falciparum. Thrombocytopenia somewhat common, but knowlesii has no reports yet of severe anemia or cerebral malaria from this species.
“Binax Now” is the U.S. bedside test for falciparum, but still needs microscopy confirmation!
3 negative smears needed for full exclusion. CDC guidelines helpful…
Coartem is new antimalarial as of 2009, but call ID if you suspect case, already increasing resistance?! Hyperparasitemia can be considered >2% blood parasite cell load.
Lactic Acidosis likely & major risk factor for severe disease & death.
JEM 2011 ~ Nigerian woman in US, sore throat, dry cough, mild fevers, similar presentation to Influenza. Consider blood smear early in endemic travelers with septic symptoms!!!
830 ~ Arboviruses (Endy, Upstate ID Chief)
ARthropod BOrne Viruses… Aedes agypti & Ixodes…
Many of these viruses have vertical transmission (i.e. mosquito reproduction). Virus induces behaviors in mosquitos to have smaller volume, increased frequency blood meals!
Systemic Fever: Chikungunya, Onyongnyong, Ross River, Dengue…
Encephalitis Viruses (West Nile, EEE…) & Hemorrhagic fevers (Yellow Fever, Dengue)
(*Ebola is not an ARBOvirus)
Cicero Swamp ~ EEE… seasonal periodic outbreaks, Culiseta mosquitos primarily bird mosquitos. Most encephalitis viruses come from bird preferring mosquitos. Humans & horses become incidental hosts. Bird migrations influence these ARBOvirus distributions.
*EEE is a togavirus (alphavirus), clinical manifestations vary… mortality once encephalitis develops ~50%!!! seasonal September, November greatest.
*JEV is highly endemic to Southeast Asia, Culex mosquitos, pigs are important vectors, can have high % viremia. Humans & horses are incidental/dead~end hosts. Seasonal & also bird migratory influence, often Feb~March. Annual incidence up to 20/100K in affected areas. IAXARO vaccine can prevent JEV?!
*St.Louis (SLEV) used to be most common in North America… (?)
*Powassan Encephalitis is Tick Transmitted flavivirus, c seasonal tick cycle, increasing incidence over last several years, still pretty rare (12/yr U.S.).
*Key West, Fla… Dengue Hemorrhagic Fever (research in Thailand), Aedes agypti (common urban mosquito), 4 serotypes, most hemorrhagic is Serotype #2. Flavivirus, variety of clinical appearances. Petechiae common in serious cases, thrombocytopenia & rapid shock can occur!
Fluid resuscitation important, & beware GI bleeding.
*CDC “ARBOnet” <diseasemaps.usgs.gov>
9a ~ Influenza (Javaid)
Every year it’s a big deal. Hemagglutinin Antigenic Shift causes major problems to ongoing immunity. Frequent Epidemics (i.e. 1918 Spanish Flu, may share partial immunity to previous strains) & Infrequent Pandemics (more complete antigenic shift of new strains)…
Spanish Flu caused 20 to 100 Million Deaths!
Annual Flu 3 to 46K Deaths… BEST utility of vaccines?
“HAN” Health Alert Network… Antigenic Shift > Drift…
2014~15 similar to the prior couple seasons, mild season 3 years ago. Worst in the elderly.
Predicting Bird Flu, Swine Flu, other Flu strains is difficult anticipatory model…
Oseltamivir still fairly effective, Amantidine no longer effective, but limited options if resistance develops.
930 ~ Pandemics (Joslin)
Pandemic is a Global Epidemic of infectious Disease, across very large area…
Epidemic is greater than anticipated occurrence of infectious diseases, (?regional, intermediate)
Outbreak is initial local occurrence of greater than anticipated ID incidence.
1918 Spanish Flu, 20M deaths
1957 Asian Flu, 1M deaths
1968 Hong Kong Flu, 1M deaths
2009 H1N1, 14K deaths
SARS, MERS, Ebola… not so much…
Epidemics: Polio, Cholera, Yellow Fever, Dengue…
Outbreaks: EV.D68 last year, Ebola…
When should pts & parents stay home? from school/work? from the hospital?
DOH & CDC public messaging…
Consider when treatment is necessary or not? Tamiflu controversy?!
Admission criteria? Who needs what resources, for pt outcomes? & epidemiology outcomes?
Alternative Care Sites (i.e. Fairgrounds Infirmary as backup site?!)
Who takes care of the Ebola pts? Residents v Attendings… Protocols? PPE?
Training, Education, & Time/Resource Committment…
1020 ~ Hepatitis (Brodey)
Formerly treated by GI > ID…
*HepC has NY mandated testing offering, ED & Obs exempt… Testing drugs available, but potentially expensive. …though cirrhosis & complications also expensive. Prevalence in Population in ED (U Alabama) ~8% confirmed Positive HepC!
POCT? Who gets the results? What to do with results? Clinic followup? Treatment?
Needlestick exposure… initial POS screening Ab test needs quantitative verification c viral load.
Many false POS. Overall chance of NOT getting HepC ~99% from needlestick. …BUT 20% self limited c complete resolution. NO postexposure Ppx.
*HepB treatable, should have vaccines & exposure IG/consider booster?
1050 ~ HIV (Reddy, Director of AIDs Center here)
35 Million infected worldwide, 3.2 Million children, mostly in SubSaharan Africa.
1.2 Million have HIV in the U.S. Florida has highest Incidence Rate now. High rates in MSM & African Americans… Sexual Transmission now > IVDU as transmission vector.
132K c HIV in NYS, but only 1 in 5 is Upstate NY?! Early DxTx improves outcomes.
ELISA testing very specific confirmatory test, doesn’t automatically need viral load. New Alere HIV 1&2 Ag/Ab test becoming more available… NYS required to offer ED testing, CDC offers extensive guidelines.
Neurologic Complaints diverge by CD4 count (Low <100? <350?)
Opportunistic: Toxo, PML, CNS lymphoma, Fungal…
Cardiovascular Conditions very common in HIV with any CD4 level.
Truvada preexposure HIV Ppx pill for HIV NEG high risk pts! can be obtained from HIV clinic.
1120 ~ Occupational Hazards (Dwyer, BioEthics)
Treating the unknown ~ HIV discovery hazards…
Quarantine? ~ SARS…
Medical Missionaries ~ Ebola & Lassa Fevers…
Exposures common. Bad anecdotes but statistical risk? Compared to other occupations…
100 doctors/year die in Auto Accidents! ~100 doctor suicides/year! …Compared to 3 deaths per year related to exposure related illness. Physician work related mortality about average to population, although Psych & ED slightly higher.
Duty to Care? Yes, but limited to “reasonable risk”
Fair procedures & policies for quarantine & segregation of infectious patients: fair & adequate resource allocation? Who gets designated an Ebola Center? Upstate designated by governor as 1 of 8 in the state.
Childcare for healthcare providers in Emergencies? Survivors benefits for firefighters in NYS are good; what about healthcare workers?
1150 ~ Ebola Response (Dufort, from Albany Med Pediatrics & ID, Epidemiology NYS DOH)
Can you opt out of CPR on Ebola patients? How’s it going in Africa? Approach to Ebola in the ED (State & National plans)?
Travel Monitoring Program ~ “CARE” kits (check & report ebola) at JFK, Newark, Washington~Dulles, Atlanta, & Chicago~OHare International airports.
“PUI” ~ person under investigation… what if they have a non~infectious need for medical care? Allocate resources from a designated center? under which conditions?
130 ~ Mandated ED ID Testing (Panel…)
Who can opt out to avoid exposures? ED Attendings, probably not in most cases… Some residents wanted to be part of the don & doff training… Senior residents? Financial limitations for training at Upstate influencing policy… Back to the idea of “unfunded mandate”?
Airborne v Droplet v Contact v Blood Exposure Precautions… which cause ethical & logistical problems? ~ Really context dependent!
Public Policy… How much in the way of public resources should be devoted to healthcare workers in terms of risk compensation with insurance & disability coverage on a larger or more specific level?
Did Ebola & other “crises” desensitize the public to appropriate disease response? Is there too much conterreaction to the “wave of preparedness”? Is the CDC message about initial exposure hospitals realistic? or did they undercut physician trust in the organization?
Do we need to clean waiting rooms better? ED challenges: how do we react to delayed implementation of infectious precautions?
230 ~ Sepsis (“McCabe lecture”, Paolo)
Case of kid with simple elbow cut, 5 days later died from TSS! So what is our threshold? Are our tools both sensitive and specific enough not to miss this? Legislators make regulations to try & make bad things stop happening to good people… Clinical Intuition/Gestalt actually pattern recognition ~ how useful for telling sick or not sick? Challenging not to do too much or too little, in the moderately sick patients…
SIRS to Sepsis… VERY nonspecific… …AND not even that sensitive! Misses 1/8!
Sensitivity 69%, Specificity 35%?!?! DOES NOT WORK?!?!
SIRS has infection in only 26%! “Other” is 56%, with greatest subcategory “mental health disorder”?! 15% of ALL ED Peds patients come in with SIRS! Of THESE, 81% were discharged, with NO IV, & NO readmission! (Only ~5% total ADM for ALL Peds!)
Is Bandemia predictive? Evidence is poor. Does not distinguish bacterial from viral reliably! Lactate lacks Specificity, possibly correlates with severity… There must be a balance between miss rate & overdiagnosis rate. There are poor anecdotes on both ends of the spectrum, with some overlap. Not always a perfect answer. We want to harm the least & Diagnose the most accurately…
EGDT & Surviving Sepsis campaigns… effective? At first, perhaps, but now ProMISe, ARISE & ProCESS trials show lack of efficacy of EGDT compared to “standard care”. IVF & ABX are effective. CVPs found unhelpful for predicting IVF responsiveness. US as surrogate for CVP no more helpful, though less invasive… Leg Raise possibly helpful to assess IVF responsiveness.
*Lactate ~ bad when elevated c hypotension. However, in normotensive individuals, not always helpful, especially since different cutoffs used… 4? Remeasurement of lactate not necessarily useful, but is pretty standard at present. Pressors in shock found mortality difference with delays of ~14 hours. Dopamine possibly more arrhythmogenic, but no total mortality benefit in Cochrane Review. Linear relation for time to Abx & Mortality, even >IVF.
“We take care of awful anecdotes all the time.” Ppl are living longer, immunomodulators, treat as appropriate, not too much, not too little, so much as possible.
Rothman adds: Slides and handouts linked below: