Card Set Information
MAP Physiology Altitude
MAP Final - Physiology at altitude
Physiological Effects of high altitude?
-lightheadedness, headache (6 up)
-insomnia, pulmonary distress, vomiting (11 up)
-breathing difficulty, anorexia, GI problems (13 up)
-lethargy, general weakness (19 up) (18 is highest habitation)
-impending collapse (25 up)
@15k Ft, 75% sat
How does body adapt to high altitude in the short term?
-increased urinary output (secrete bicarb)
-increased cardiac output
-pulmonary hypertension (blood is being shunted away from hypoxic areas...pulmonary vessels constrict)
How does the body adapt to high altitude in the long term?
(weeks to months, really 6 months)
-increased EPO, increased hematocrit (RBCs)
-increased 2,3 BPG
-pulmonary hypertension, RV hypertrophy (some)
-increase capillaries in skeletal muscle
Acute Mountain Sickness?
-headache, nausea, lethargy/apathy, coordination, confusion...see it around 8000 feet
-Lake Louise Score helps diagnose severity of Acute Mountain Sickness, 3-5 is mild
Treatment of AMS?
-acclimate (3-4 days)
-drugs to speed up the process - diuretics to speed up bicarb excretion - Diamox**
-steroids (for severe AMS)
High altitude pulmonary edema...arise from the pulmonary hypertension
-short of breath at rest, wheezing, crackles**
: descend*, Ca-channel blockers, steroids, vasodialators (viagra) to prevent the hypertension, supplemental O2
High altitude cebrebral edema
-confusion ataxia, coordination impairment
: descend!, dex a Ca-channlel blocker, supplemental O2, gamow bag
What are the operational considerations to high altitiude missions?
-sleep (train high, sleep low)
-cold weather gear
-turn around times