Revista brasileira de psiquiatria (Sao Paulo, Brazil : 1999) · 2013
The panic disorder respiratory ratio: a dimensional approach to the respiratory subtype.
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Freire Rafael Christophe, Nascimento Isabella, Valença Alexandre Martins, Lopes Fabiana Leão, Mezzasalma Marco André, Melo Neto Valfrido Leão de, Zin Walter Araujo, Nardi Antonio Egidio
Аннотация
OBJECTIVE: The respiratory ratio is a dimensional construct of the respiratory subtype of panic disorder (PD). The respiratory subtype has been correlated with an increased sensitivity to CO₂ inhalation, positive family history of PD and low comorbidity with depression. The objective of our study was to determine whether the respiratory ratio is correlated with CO₂-induced panic attacks and other clinical and demographic features.
METHODS: We examined 91 patients with PD and submitted them to a double-breath 35% CO₂ challenge test. The respiratory ratio was calculated based on the Diagnostic Symptom Questionnaire (DSQ) scores recorded in a diary in the days preceding the CO₂ challenge. The scores of the respiratory symptoms were summed and divided by the total DSQ score.
RESULTS: The respiratory ratio was correlated with CO₂ sensitivity, and there was a non-statistically significant trend towards a correlation with a family history of PD.
CONCLUSIONS: The positive correlation between the respiratory ratio and the anxiety elicited by the CO₂ inhalation indicates that the intensity of respiratory symptoms may be proportional to the sensitivity to carbon dioxide.
METHODS: We examined 91 patients with PD and submitted them to a double-breath 35% CO₂ challenge test. The respiratory ratio was calculated based on the Diagnostic Symptom Questionnaire (DSQ) scores recorded in a diary in the days preceding the CO₂ challenge. The scores of the respiratory symptoms were summed and divided by the total DSQ score.
RESULTS: The respiratory ratio was correlated with CO₂ sensitivity, and there was a non-statistically significant trend towards a correlation with a family history of PD.
CONCLUSIONS: The positive correlation between the respiratory ratio and the anxiety elicited by the CO₂ inhalation indicates that the intensity of respiratory symptoms may be proportional to the sensitivity to carbon dioxide.