Hypocapnia in women with fibromyalgia

Author:

Jonsson Kent12,Pikwer Andreas34,Olsson Erik M. G.5,Peterson Magnus26

Affiliation:

1. Department of Rehabilitation Medicine, Nykoping Hospital , Nykoping , Sweden

2. Department of Public Health and Caring Sciences, Section of Family Medicine, Uppsala University , Box 564, SE-751 22 , Uppsala , Sweden

3. Centre for Clinical Research Sörmland, Uppsala University , Uppsala , Sweden

4. Department of Anesthesia, Eskilstuna County Hospital , Eskilstuna , Sweden

5. Department of Women’s and Children’s Health, Healthcare Science and e-health, Uppsala University , Uppsala , Sweden

6. Academic Primary Health Care, Region Uppsala , Uppsala , Sweden

Abstract

Abstract Objectives The purpose of this study was to investigate whether people with fibromyalgia (FM) have dysfunctional breathing by examining acid–base balance and comparing it with healthy controls. Methods Thirty-six women diagnosed with FM and 36 healthy controls matched for age and gender participated in this cross-sectional study. To evaluate acid–base balance, arterial blood was sampled from the radial artery. Carbon dioxide, oxygen, bicarbonate, base excess, pH and lactate were analysed for between-group differences. Blood gas analyses were performed stepwise on each individual to detect acid–base disturbance, which was categorized as primary respiratory and possible compensation indicating chronicity. A three-step approach was employed to evaluate pH, carbon dioxide and bicarbonate in this order. Results Women with FM had significantly lower carbon dioxide pressure (p = 0.013) and higher lactate (p = 0.038) compared to healthy controls at the group level. There were no significant differences in oxygen pressure, bicarbonate, pH and base excess. Employing a three-step acid–base analysis, 11 individuals in the FM group had a possible renally compensated mild chronic hyperventilation, compared to only 4 among the healthy controls (p = 0.042). Conclusions In this study, we could identify a subgroup of individuals with FM who may be characterized as mild chronic hyperventilators. The results might point to a plausible dysfunctional breathing in some women with FM.

Publisher

Walter de Gruyter GmbH

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