Environmental Injuries and the Athlete
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1 Environmental Injuries and the Athlete Presentation subtitle Heat Illness Hypothermia Frostbite Altitude Illness Month Day, Year Thomas Moran MD Northshore University Health System Clinician educator, University of Chicago
2 Introduction Chicago Marathon >41,000 runners 2006 (36 start,48 high with slight rain) 2007 (88 high, 80% humidity) American Birkebeiner >10,000 skiers 2011 (-6 start) Last decade, 6 starts under 10 Leadville 100 >300 runners Start 10,400 ft, peak >12,500 ft
3 Objectives Heat illness -Recognize signs and symptoms of Heat related emergencie Winter Athlete
4 Heat Illness Heat Exhaustion Sign of systemic vascular strain in body s attempt to maintain temp. Heat Stroke Continuation of above but with evidence of altered mental status.
5
6 Heat Illness Doug Schmied Offensive guard IL Wesleyan 2005 Steve Bechler Pitcher Baltimore Orioles Feb 2003 Fran Crippen Swimmer Gold medalist Oct 2010 Luke Roach Chicago Marathon Mile 26 Oct 2001
7 Exertional heat illness Factors contributing: 1) Increased internal production Physical activity Pharmacologic agents Febrile illness 2) Increased External heat gain High ambient temperature 3) Decreased ability to disperse heat Humidity Protective gear Pharmacologic agents
8 Heat Illness Heat Exhaustion Signs of systemic vascular strain in body s attempt to maintain basal temperature. Temp Heat Stroke Same as above but w/ end organ damage. Temp >104 *AMS Also consider Hyponatremia (AMS with normal temp)
9 Heat Illness Diagnosis -Heightened level of suspicion -Temperature Rectal. (Thermometers inaccurate in exercising individuals) Treatment -Cool now
10 Cooling Modalities
11 Cold Water Immersion
12 Duration of cooling F F CWI Cold towels to major vessels Fan F 104 F
13 Treatment Treatment Take action Rapid cooling Normal mental status, temp <104 PO liquid, shade, wet towels AMS and/or temp >104 Immediate ice bath immersion Remove at 102 (cool 1 e 3min)
14 Heat Illness Doug Schmied Offensive guard IL Wesleyan 2005 Steve Bechler Pitcher Baltimore Orioles Feb 2003 Fran Crippen Swimmer Gold medalist Oct 2010 Luke Roach Chicago Marathon Mile 26 Oct 2001
15 Heat Illness Prevention Acclimatization Clothing Medications Hydration ( loss, 1L/hr) Activity planning reduction
16 Acclimation Within days to 1 st week: 1. Heart rate decreases 2. Changes in skin and core temp 3. Increased sweat rate -Changes in sweat composition 4. Increased work capacity Faster response in highly trained individuals Optimal acclimation time days Decay rate is slower then acclimatation (4 weeks)
17 Heat acclimation and performance? Power output during a km cycling TT in TTC (plain line) TTH-1 (long dashed line), TTH-2 (short dashed line), TTH-3 (dotted line) RACINAIS, S; PÉRIARD, J.; KARLSEN, A; NYBO, L. Effect of Heat and Heat Acclimatization on Cycling Time Trial Performance and Pacing. Medicine & Science in Sports & Exercise47(3): , March 2015.
18 Clothing Sun protection Light color Wicking Precooling strategies?
19 Can precooling improve performance?
20 Medications Too much heat production -SSRIs -MAOIs -amphetamines -ephedra Inability to dissipate -anticholinergics -antihistamines -clonidine (Klonapin)
21 Hydration Hydration Status Plasma osmolality and urine specific gravity. Euhydrated if daily body mass changes remain <1% for several days, plasma osmolality is <290 mmol/kg and urine specific gravity is < General methods To Establish Baseline Measure post-void nude body mass in the morning on consecutive days after consuming 1 2 L of fluid the prior evening. Urine color
22 Wet-Bulb Globe Temperature -Temperature -wind speed -humidity -radiation
23 Marathon Experience >40,000 runners Medical volunteers RN, PT, MD/DO, podiatry, massage therapist 2-8+ hrs athletes are exposed to environment. Drastic weather changes year to year.
24 Environmental Injuries: The Winter Athlete Thomas Moran MD Northshore University Health System Clinician educator, University of Chicago
25 Cold Injury Hypothermia Core body temperature below 95 F (35 C). Frostbite Direct freezing of tissue when skin temperature drops below 32 F (0 C) Man in the cold is not necessarily a cold man. -David Bass 1958
26 Physiologic response to Cold Peripheral Vasoconstriction -First response to cold exposure. -Once Skin temp below 95 F. -Insulating effect. Increased metabolic heat production - Shivering, peaks with skin temp 68 F and core of 95. -Increases basal metabolic rate up to 5x baseline.
27
28 Hypothermia Definition: Core temperature less than 95 Develops when total body heat loss exceeds physiologic heat production.
29 Diagnosis -Accurate core temp Hypothermia -Symptom recognition: >90 Early symptoms Feeling cold, shivering, social withdrawal Moderate hypothermia Confusion, sleepiness, slurred speech *Irritable cardiac tissue <82 Severe Eventual loss of consciousness, loss of reflexes *Arrhythmias common
30 J-wave
31 Predisposing Risk Factors Castellani, John W et al. Prevention of Cold Injuries During Exercise. Medicine & Science in Sports & Exercise. 38(11): , November 2006.
32 Hypothermia Temp Features Treatment/Rewarming 95 Max shivering Passive external 91 Ataxia, apathy Passive external 90 Stupor, shivering ceases, Arrhythmias Active external <82 Decreased Vfib threshold Active core Treatment Mild: Remove cold, wet clothing. Shelter Allow shivering Avoid massage Passive external (warm blankets, PO warm liquid) Moderate to Severe: Active external (hot water bottles, heating pads, etc) Active core (D5NS at ) *Afterdrop Phenomenon
33
34 Frostbite Localized cold injury produced by freezing of tissue. Sites typically affected are furthest from core. Hands, feet, face, nose and ears Also from direct contact. Metal, petroleum products
35 Frostbite Sensation at varying skin temperatures: 82 Cooling sensation 68 Pain 50 Numbness Vasoconstriction Hypoxia Cold exposure Tissue freezing Cell wall damage Inflammation Prostaglandin F2a, thromboxane
36 Risk Factors Castellani, John W et al. Prevention of Cold Injuries During Exercise. Medicine & Science in Sports & Exercise. 38(11): , November 2006.
37 Frostbite Superficial- Normal skin color, large blisters (serous or white), intact pinprick, skin indents with pressure. Deep- Nonblanching cyanosis, dark blisters (sanguineous), Skin wooden to touch.
38 Frostbite Prognosis: Vascular studies Watchful waiting. ultimate viability not determined until 22-45days. Treatment: Do not rewarm if risk of refreezing! Do not massage! Rapid submersion.rewarm affected parts in H 2 O ( ) Debride clear blisters, Leave blood filled
39 Frostbite blister presentation
40 Case 19yo college XC runner following up for tibia stress reaction Week previous, had increased mileage Went for 13mi run in bitter cold Next day Blood blister on dorsum of great toe Attributed to runners toe 1 week later
41 Protected area Activity modification Wait and see 10 days after initial eval Case
42 Cold Injury - Prevention *Avoid cold wet exposure* Choice clothing 3L Loose Layered Lightweight Wind/waterproof outer layer Avoid emollients on skin Thorleifsson, A., and H. C. Wulf. Emollients and the response of facial skin to a cold environment. Br. J. Dermatol. 148: , 2003
43 Cold injury Prevention NOAA.gov
44
45 Altitude affects Altitude environment Cold Low Humidity UV radiation Decreased air pressure Linear correlation between barometric pressure and available oxygen mmhg Sea level -520 mmhg 10, mmhg 18,000 ft University of Colorado
46 High Altitude Illness AMS Acute Mountain Sickness HACE High-altitude cerebral edema HAPE High-altitude pulmonary edema -Rapid ascent past 8,000ft -Headache is usually initial symptom of illness -Descent is definitive therapy
47 High Altitude Illness AMS Acute Mountain Sickness HACE High-altitude cerebral edema HAPE High-altitude pulmonary edema -Most common illness by travelers to altitude -Symptoms 6-12 hrs after ascent to >8,000ft. Headache with: nausea, fatigue, dizziness or insomnia -No validated physiologic markers
48 High Altitude Illness AMS Acute Mountain Sickness HACE High-altitude cerebral edema HAPE High-altitude pulmonary edema Lake Louse Questionnaire 1) Headache 2) Additional symptom 3) Total score >3
49 High Altitude Illness AMS Acute Mountain Sickness HACE High-altitude cerebral edema HAPE High-altitude pulmonary edema CNS symptoms ataxia, altered consciousness, confusion, drowsiness, stupor and coma Underlying mechanism is unclear.
50 High Altitude Illness AMS Acute Mountain Sickness HACE High-altitude cerebral edema HAPE High-altitude pulmonary edema MCC of altitude related death. Typically presents 48-96hrs after arrival above 8,000ft AMS with classic signs of pulmonary edema (wet cough, dyspnea at rest, weakness and orthopnea) Etiology for disease: Hypoxia leads to exaggerated hypoxic pulmonary vasoconstriction. Increased PA pressure Subsequent transudative leak.
51 Treatment Acute Mountain Sickness - assent and rest. -Descend/recompression if no improvement -Low flow oxygen -Carbonic anhydrase inhibitor Acetazolamide ( mg BID) HACE & HAPE -Immediate descent, Oxygen -Specific Adjuvant medications HACE-Dexamethasone 8mg once, 4mg QID HAPE-Nifedipine 30mg BID
52 Ibuprofen as prophylaxis?
53 Prevention Begin exertion below 8,000ft High Altitude Illness 2-3 nights 8-10,000ft then ascend Beyond 10,000ft, ascend 1500 ft before another nights rest Avoid alcohol and opiates Avoid dehydration and hypothermia Acetazolamide mg BID Dexamethasone 4mg PO BID Proposed prevention meds: -Ibuprofen 600mg TID, -Sildenafil,
54 Role of Nitric Oxide -Observed increases in NO during acclimatization. -PDE-5 as treatment and prophylaxis -Adjuvant treatment in cases with HAPE -Prophylaxis SE profile outweighs protective benefit. Bates MG et al. Sildenafil citrate for the prevention of high altitude hypoxic pulmonary hypertension. High Alt Med Biol.2011; 12 (3):
55 Altitude Allow adequate acclimatization above 8000ft. Ascend less than 1500 ft per day. Identify altitude related illness HAPE and HACE are emergencies! Definitive treatment is descent. Prophylaxis includes slow assent and if necessary Carbonic Anhydrase inhibitors.
56 Thank You Bartsch P, Swenson ER. Acute high-altitude illnesses. N Engl J Med Oct 24;369(17): Castellani J, Young A, Ducharme M et al. Prevention of Cold Injuries during Exercise. Medicine and Science in Sports and Exercise. 2006; 06: Grieve A, Davis P, Dhillon S, Richards P, Hillebrandt D, Imray C. A clinical review of the management of frostbite. J R Army Med Corps. 2011: 157(1):73-8. Derby R, DeWeber K. The Athlete and High Altitude. Current Sports Medicine Reports. 2010: 9 (2):
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