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G-LOC

G-LOC. LTC William W. Pond, MD, FS Chief Aerospace Medicine. G-LOC: Importance. Important cause : 1982-1998---26 aircraft lost 1985-1998---402 Class C Mishaps Decrease performance. G-LOC: Cause. Inadequate oxygen to the brain: Caused by inadequate blood flow:

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G-LOC

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  1. G-LOC LTC William W. Pond, MD, FS Chief Aerospace Medicine

  2. G-LOC: Importance • Important cause : • 1982-1998---26 aircraft lost • 1985-1998---402 Class C Mishaps • Decrease performance

  3. G-LOC: Cause • Inadequate oxygen to the brain: • Caused by inadequate blood flow: • Caused by insufficient blood pressure toward the head to overcome G forces pushing/pulling blood away from the head

  4. G-LOC: Heart, Brain, Eyes • Heart has high metabolic requirement and has static inflation pressure, but coronary artery flow is little affected by Gs. • Brain loses consciousness in hypoxia. • Eye loses vision, peripheral first . • Vision lost earlier than consciousness due to intraocular static pressure. • 5-7 second reserve of oxygen

  5. G-LOC: Effect on Eye • Decreased blood flow • Eye reacts first • Grayout • Tunnel Vision • Immediate return of function with restoration of blood flow

  6. G-LOC: Effects on Brain • Brain stays “turned off” even after flow restored. • Absolute incapacitation-----12-16 seconds • (Range 5-30) • Dream like state • Unaware of environment • Relative incapacitation----12 seconds • (Range 8-80) • May respond to “pull –up, pull-up” command

  7. G-LOC: Recognition • May go unnoticed due to partial amnesia • Suspect for sudden loss of altitude • Tingling around mouth • Sense of dreaming • May recognize during debriefing • Never use visual symptoms to test your current G tolerance

  8. G-LOC: Tolerance • Anti G Straining Maneuver • Anticipation of G-onset • Physical and psychological condition • G awareness • Combat Edge • Reclined Seat

  9. G_LOC: Recognition (May occur unnoticed)

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