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as loss of cabin pressure, On-Board Oxygen Generation Systems (OBOGS) malfunction, or otherwise. The aviator may then take measures to address these other causes without considering hypocapnia as the cause of his or her symptoms. Fear and anxiety, among other stressors, are a prime contributor to hyperventilation. 1 The mechanism whereby hypocapnia decreases cerebral perfusion and thereby consciousness is twofold. As blood pH rises, arteries vasoconstrict, reducing cerebral perfusion. This hypoxic effect of hypocapnia may be further increased as cellular