Increased risk of cerebral white matter lesions in obstructive sleep apnea syndrome

Investigation of serum endocan and serglycin levels in obstructive sleep apnea

BACKGROUND

Apnea-related hypoxia, hypercapnia, and blood pressure fluctuations cause production of various proinflammatory cytokines and trigger a vicious cycle that results in vascular endothelial damage and systemic inflammation in obstructive sleep apnea (OSA). Endothelial function is frequently impaired in OSA even in the absence of significant cardiac or vascular disorders.

AIMS

This study aimed to investigate the serum endocan and serglycin levels in OSA patients.

METHODS

This prospective study included 78 consecutive patients who admitted to the sleep laboratory of a tertiary referral center with the complaints of daytime sleepiness, witnessed sleep apnea, and/or snoring and who underwent all-night polysomnography (PSG). After PSG, the patients were divided into four groups in relation with their apnea-hypopnea indexes. The groups were compared for endocan and serglycin levels and their correlations with OSA severity. The correlations with demographic data and PSG findings were also investigated.

RESULTS

The OSA and the control groups had significantly different endocan and serglycin levels ([Formula: see text], for both). On univariate logistic regression analysis, it was found that serglycin and endocan levels and BMI were predictors of OSA. Multiple logistic regression analysis showed that endocan and serglycin levels were independent predictors for OSA ([Formula: see text] and [Formula: see text], respectively).

CONCLUSIONS

We have demonstrated that elevated endocan and serglycin levels are predictors for OSA. Furthermore, we have showed for the first time in literature that serglycin is correlated with OSA and is an independent predictor for OSA.

Elevated serum calprotectin as an inflammatory marker in obstructive sleep apnea

OBJECTIVE

To investigate the serum calprotectin (SCal) levels and neutrophil/lymphocyte ratio (NLR) values in patients with obstructive sleep apnea (OSA).

METHODS

Sixty-seven OSA patients and 46 healthy volunteers without any sleep disorders were included in the study. The patient group was divided into three subgroups according to the severity of OSA. The SCal levels and NLR values were compared among subgroups and between the experimental and control groups.

RESULTS

The mean SCal level and NLR value were higher in the study group than in the control group (p = 0.002 and p = 0.001, respectively). The SCal levels were significantly higher in patients with severe OSA than in those with moderate and mild OSA (p = 0.004 and p = 0.001, respectively).

DISCUSSION

Unlike NLR, the SCal level may inform the severity of OSA and could be used as an indicator for OSA.