Article

Erythrocyte deformability, plasma viscosity and oxidative status in patients with severe obstructive sleep apnea syndrome.

Department of Physiology, Faculty of Medicine, Hacettepe University, 06100 Ankara, Turkey.
Sleep Medicine (impact factor: 3.4). 04/2006; 7(3):255-61. DOI:10.1016/j.sleep.2005.12.005
Source: PubMed

ABSTRACT In patients with severe obstructive sleep apnea syndrome (OSAS), diurnal changes of plasma viscosity and erythrocyte deformability were measured to elucidate the possible mechanism of cardiovascular diseases in OSAS patients.
Plasma viscosity and erythrocyte deformability was determined in 11 OSAS patients and 11 healthy subjects matched by sex and age. Plasma viscosity was measured by a cone-plate viscometer, and erythrocyte deformability was determined by filtration technique. Whole blood counts were performed and oxidative status of the patients' plasma and erythrocytes were evaluated.
OSAS patients had higher plasma viscosity than controls, both in the morning (1.74+/-0.3 vs. 1.36+/-0.2 mPas, P<0.002) and evening (1.55+/-0.2 vs. 1.27+/-0.1 mPas, P<0.002), and morning plasma viscosity was significantly higher than the evening level (P<0.05). Morning plasma viscosity of patients was inversely correlated with their mean nocturnal SaO(2). Morning plasma malonyldialdehyde level was significantly higher in the patients than in the controls (69.7+/-30.5 vs. 45.5+/-11.0 nmol/l, P<0.005). Erythrocyte deformability of the patients was slightly lower.
We have observed that plasma viscosity is high both in the morning and in the evening in severe OSAS patients. This elevation may predispose OSAS patients to myocardial infarction and stroke by increasing blood viscosity. Low nocturnal mean SaO(2) may be responsible for the high plasma viscosity in these patients.

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Keywords

11 healthy subjects
 
11 OSAS patients
 
apnea syndrome
 
blood viscosity
 
cone-plate viscometer
 
erythrocyte deformability
 
evening level
 
mean nocturnal SaO(2)
 
Morning plasma malonyldialdehyde level
 
morning plasma viscosity
 
myocardial infarction
 
OSAS patients
 
oxidative status
 
P<0.005). Erythrocyte deformability
 
P<0.05). Morning plasma viscosity
 
patients' plasma
 
plasma viscosity
 
severe obstructive
 
severe OSAS patients
 
Whole blood counts