Eur Respir J 2006; 27:756-760
Copyright ©ERS Journals Ltd 2006
Antioxidant status in patients with sleep apnoea and impact of continuous positive airway pressure treatment
A. Barceló1,
F. Barbé2,
M. de la Peña1,
M. Vila1,
G. Pérez1,
J. Piérola1,
J. Durán3 and
A. G. N. Agustí4
1 Serveis de Anàlisis Cliniques, 2 Pneumologia, Hospital Universitario Arnau de Vilanova Lleida, 3 Hospital Txagorritxu, Vitoria-Gasteiz, and 4 Hospital Universitari, Son Dureta, Institute Universitari de Ciencies de la Salut (IUNICS), Fundació Caubet-Cimera, Palma de Mallorca and Servicio de Neumología, Spain.
CORRESPONDENCE: A. Barceló, Servicio de Análisis Clínicos, Hospital, Universitari Son Dureta. C/ Andrea Doria 55, 07014 Palma de Mallorca, Spain. Fax: 34 971175228. E-mail: abarcelo{at}hsd.es
Keywords: Clinical trial, continuous positive airway pressure, oxidative stress
Received: June 10, 2005
Accepted November 25, 2005
The episodes of hypoxia/re-oxygenation associated with the respiratory disturbances observed in patients with obstructive sleep apnoea syndrome (OSAS) may induce the generation of oxygen free radicals. Indeed, several studies suggest that OSAS is associated with oxidative stress. The present study tested the hypothesis that patients with OSAS have an alteration in antioxidant defences.
The plasma levels of total antioxidant status (TAS), glutathione peroxidase (GPX), -glutamyltransferase (GGT), vitamins A, E, B12 and folate, and homocysteine were determined in 47 patients with OSAS and 37 healthy subjects. Of these, 27 patients who used continuous positive airway pressure (CPAP) for >4 h·night1 were re-examined 12 months later.
Patients with OSAS had lower TAS (1.4±0.16 versus 1.50±0.10 mmol·L1), vitamin A (64±19 versus 74±17 µg·dL1) and vitamin E levels (1,525±499 versus 1,774±503 µg·dL1), and increased values of GGT (42±22 versus 32±16 U·L1) than controls. There was no difference between groups in GPX, homocysteine, vitamin B12 and folate plasma levels. CPAP treatment normalised the levels of TAS (1.50±0.13 mmol·L1) and the activity of GGT (30±14 U·L1) without any influence on vitamins levels.
In conclusion, the results indicate that patients with obstructive sleep apnoea syndrome have a decreased antioxidant capacity that is partially reversed by continuous positive airway pressure treatment.
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Copyright © 2006 by the European Respiratory Society.
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