Discrimination between panic disorder and generalized anxiety disorder by 35% carbon dioxide challenge

Abstract

OBJECTIVE: The authors' goal was to determine whether 35% carbon dioxide (CO2) challenge would discriminate between patients with panic disorder and patients with other anxiety disorders. METHOD: Nine patients with panic disorder and nine with generalized anxiety disorder underwent the 35% CO2 challenge. RESULTS: Patients with panic disorder experienced a significantly stronger increase in subjective anxiety than patients with generalized anxiety disorder. However, increases in panic symptom scores were high in both groups. CONCLUSIONS: These results suggest that a large increase in subjective anxiety due to the CO2 challenge is specific for patients with panic disorder but that an increase in panic symptoms is not.

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