Types of thromboembolic events:
(1) stroke
(2) transient ischemic attack
(3) pulmonary embolism
(4) deep vein thrombosis
Risk factors for a thromboembolic event:
(1) pre-existing hypercoagulable state
(2) polycythemia
(3) dehydration
(4) cold injury
(5) venous stasis from inactivity, tight clothing or constricting equipment straps
(6) ascent to > 4,200 meters (> 13,800 feet)
(7) immobilization of a limb following injury
(8) oral contraceptives or other procoagulant drugs
Risk factors for complications if a thromboembolic event occurs:
(1) onset of paralysis while climbing
(2) delayed evacuation due to inclement weather
(3) significant thromboembolic event (stroke, pulmonary embolism, etc.)
Preventive measures:
(1) Keeping warm.
(2) Keeping active.
(3) Minimizing areas of constriction.
(4) Maintaining hydration.
(5) Having a reasonable rate of ascent with acclimatization.
(6) Consider prophylaxis in high risk patients (or else discourage them from making the ascent).
