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Do blood phobia patients hyperventilate during exposure by breathing faster, deeper, or both?

Ritz, Thomas and Wilhelm, Frank H. and Meuret, Alicia E. and Gerlach, Alexander L. and Roth, Walton T.. (2009) Do blood phobia patients hyperventilate during exposure by breathing faster, deeper, or both? Depression and anxiety, 26 (2). pp. 60-67.

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Abstract

BACKGROUND: Recently we found that patients with blood-injection-injury (BII) phobia tend to hyperventilate when exposed to feared stimuli. Hyperventilation results from increases in minute ventilation above levels required by metabolic demand and can result from increases in either frequency or depth of breathing, or a combination of both. METHOD: In order to determine which of these factors contributed most to hyperventilation in BII phobia we analyzed breathing patterns of BII phobia patients (N=12) and non-anxious controls (N=14), recorded with respiratory inductance plethysmography. Participants viewed ten film clips of either an emotionally positive, negative, or neutral quality, as well as surgery and asthma-relevant clips. During five film clips (one from each category) they also tensed their leg muscles. RESULTS: Minute ventilation was markedly increased in blood phobia patients compared to other groups during surgery films. Also, tidal volume and irregularity of tidal volume showed strong increases, while respiration rate was not affected. Leg muscle tension increased ventilation in general but far below the extent brought about by hyperventilation in BII phobia. Patients who were breathing deeper during exposure reported stronger symptoms of dizziness, light-headedness and faintness. In general, patients showed a higher rate of spontaneous sighs throughout all film presentations, but not at baseline. CONCLUSION: Thus, hyperventilation in blood phobia is produced by excessively deep and irregular breathing and may contribute to fainting responses. Behavioral interventions for BII phobia could benefit from attention to this aspect of dysfunctional breathing.
Faculties and Departments:07 Faculty of Psychology
07 Faculty of Psychology > Departement Psychologie > Ehemalige Einheiten Psychologie > Abteilung Klinische Psychologie und Psychiatrie
07 Faculty of Psychology > Departement Psychologie > Ehemalige Einheiten Psychologie > Psychophysiologie (Wilhelm)
UniBasel Contributors:Wilhelm, Frank H
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Wiley-Liss
ISSN:1520-6394
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
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Last Modified:28 Sep 2017 15:43
Deposited On:22 Mar 2012 13:53

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