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CO2 challenge of patients with panic disorder

Published Online:https://doi.org/10.1176/ajp.144.8.1080

In an open trial, five of eight panic disorder patients and none of five control subjects panicked after inhalation of two breaths of 35% CO2 and 65% O2; none panicked after placebo. Using 35% CO2 to induce panic is safe, simple, and well tolerated and may provide a valuable laboratory model of panic.

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