exertional heat stroke definition epidemiology n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Exertional Heat Stroke Definition & Epidemiology PowerPoint Presentation
Download Presentation
Exertional Heat Stroke Definition & Epidemiology

Loading in 2 Seconds...

play fullscreen
1 / 12

Exertional Heat Stroke Definition & Epidemiology - PowerPoint PPT Presentation


  • 310 Views
  • Uploaded on

Exertional Heat Stroke Definition & Epidemiology. William O Roberts MD, MS, FACSM St Johns Family Medicine Residency Department of Family Medicine University of Minnesota Medical School. Definition of EHS – Part 1. Hyperthermia during physical activity Rectal (core) temperature > 40-42 º C

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Exertional Heat Stroke Definition & Epidemiology' - aristotle-mcpherson


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
exertional heat stroke definition epidemiology

Exertional Heat StrokeDefinition & Epidemiology

William O Roberts MD, MS, FACSM

St Johns Family Medicine Residency

Department of Family Medicine

University of Minnesota Medical School

definition of ehs part 1
Definition of EHS – Part 1
  • Hyperthermia during physical activity
    • Rectal (core) temperature > 40-42 ºC
  • Due to
    • Impaired dissipation of endogenous metabolic heat
    • Exogenous heat gain
      • Extreme heat conditions
definition of ehs part 2
Definition of EHS – Part 2
  • Associated with organ system dysfunction or failure
    • Brain (CNS dysfunction)
      • CNS status impaired
      • Loss of lower limb function
    • Heart, liver, kidney, muscle
epidemiology learning from experience
EpidemiologyLearning from Experience
  • Construction sites, war, road racing, football, & military training provide “heat labs”
  • Falmouth Road Race
    • 1-2 EHS per 1000 finishers
  • Twin Cities Marathon 24 year average
    • 1 EHS per 10,000 finishers
    • 2007 – 12 per 10,000
  • 2007 Grandma’s Marathon
    • 28 per 10,000 finishers
  • Death reviews provide prevention & treatment “failure” data
ehs mortality bands keatinge
EHS Mortality Bands(Keatinge)
  • Mortality higher at lower temp range in higher latitudes
  • Higher temps as mean summer temps rise
  • Acclimatization from living in area
tcm 2007 outcomes
TCM 2007 Outcomes
  • Start WBGT 72ºF, 4 hr WBGT 81ºF
  • Starters = 8093
  • Finishers = 7226
  • Unsuccessful starters (DNF) = 867
  • Medical encounters = 291
  • Medical encounters/1000 finishers = 40
  • Unsuccessful participants/1000 finishers = 160
  • EHS = >12/10,000 finishers
  • MCI criteria surpassed
slide7

>12 per race

4-5 per race

0-1 per race

Unpublished data, W Roberts

slide8

>103

Unpublished data, W Roberts

unrecognized untreated ehs is fatal rae 2008
Unrecognized, Untreated EHS is Fatal(Rae, 2008)
  • 5 bikers died in same bicycle race
    • Not diagnosed on site
  • Delays probably caused deaths
  • EHS victims do not cool to safe levels spontaneously
    • Cooling essential
football experience
Football Experience
  • Most fatal heat stroke in first 1-4 days
    • Implies role of acclimatization
  • Early season heat related HS & youth football deaths
    • 2006 – 5
    • 2007 – 5
    • 2008 – 4-5
  • Heat “capacitance”
    • Large players
slide11

Heat Balance Equation

Initial Body Temperature

Sleep & Air conditioning

Illness

Intensity & duration

+

Metabolic Heat Produced

Environmental Heat Absorbed

Env temp > Body temp

Radiant heat

+

Body Heat Removed

Sweat

Heat transport

Heat transfer

Acclimatization

Insulation

-

Final Body Temperature

thank you
Thank You!

rober037@umn.edu