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Carbon dioxide test as an additional clinical measure of treatment response in panic disorder

By Valença Alexandre M., Nardi Antonio Egidio, Nascimento Isabella, Zin Walter A. and Versiani Márcio

Abstract

OBJECTIVE: We aim to determine if a treatment with a dose of clonazepam - 2 mg/day, for 6 weeks, blocks spontaneous panic attacks and the ones induced by the inhalation of 35% carbon dioxide (CO2) in panic disorder (PD) patients. The CO2 challenge-test may be a useful addition tool for measuring the pharmacological response during the initial phase (6 weeks) in the treatment of PD. METHOD: Eighteen PD patients drug free for a week participated in a carbon dioxide challenge test. Fourteen had a panic attack and were openly treated for a 6-week period with clonazepam. At the end of the 6-week period they were submitted again to the CO2 challenge test. RESULTS: After 6 weeks of treatment with clonazepam, 12 of 14 PD patients (85.7%) did not have a panic attack after the CO2 challenge test. Just 2 of 14 patients (14.3%) had a panic attack after the CO2 challenge test. Ten of 14 (71.4%) PD patients had panic free status after clonazepam treatment. The 2 patients who had a panic attack in the sixth week, after the CO2 test, did not have panic free status after the treatment with clonazepam. CONCLUSION: The CO2-test may be a valid tool for testing and predicting the drug response

Topics: panic disorder, benzodiazepine, carbon dioxide, clonazepam, Neurosciences. Biological psychiatry. Neuropsychiatry, RC321-571, Internal medicine, RC31-1245, Medicine, R, DOAJ:Neurology, DOAJ:Medicine (General), DOAJ:Health Sciences
Publisher: Academia Brasileira de Neurologia (ABNEURO)
Year: 2002
OAI identifier: oai:doaj.org/article:42a22c40dc094db8a3a8bcfe62478313
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