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Circulating nitric oxide (NO), asymmetric dimethylarginine (ADMA), homocysteine, and oxidative status in obstructive sleep apnea–hypopnea syndrome (OSAHS)

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Abstract

Obstructive sleep apnea–hypopnea syndrome (OSAHS) with episodic hypoxia–reoxygenation is associated with increased cardiovascular morbidity and mortality. Therefore, increased homocysteine, asymmetric dimethylarginine (ADMA), oxidative status, and decreased nitric oxide levels have been implicated as possible mechanisms for development of cardiovascular diseases. We aimed to investigate changes in the levels of these substances in patients with OSAHS in comparison with nonapneic controls. Thirty-four OSAHS patients and 15 healthy controls were included in this study. In the blood samples, oxidative status and nitric oxide levels were measured with spectrophotometric methods. Plasma ADMA and homocysteine levels were determined by using high-performance liquid chromatography with fluorescence detection. Nitric oxide levels were significantly low in OSAHS patients (p < 0.05) and correlated with mean SaO2 (r = 0.513, p < 0.002) and lowest SaO2 (r = 0.363, p < 0.03). Oxidative status, ADMA, and homocysteine levels were higher in OSAHS patients, but difference did not reach statistical significance. After dividing patients into moderate (AHI = 5–29) and severe (AHI ≥ 30) OSAHS groups, significantly increased homocysteine levels were observed in the severe OSAHS group (p < 0.05). Nitric oxide levels negatively correlated with oxidative status in total OSAHS patients (r = −0.415, p < 0.02) and also in severe OSAHS group (r = −0.641, p < 0.007). Hyperhomocysteinemia and diminished NO production may be causal factors in endothelial dysfunction seen in OSAHS and may explain the association between OSAHS and cardiovascular diseases. These modifiable factors should be monitored in patients suspected of having OSAHS.

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Acknowledgment

We thank Prof. Kemal Erbil and Asist. Prof. Erdinç Çakır for their helpful assistance in ADMA measurements. This study was supported by The Scientific and Technological Research Council of Turkey (SBAG-AYD-457, 104S066).

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Correspondence to Yeşim Ozkan.

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Ozkan, Y., Fırat, H., Şimşek, B. et al. Circulating nitric oxide (NO), asymmetric dimethylarginine (ADMA), homocysteine, and oxidative status in obstructive sleep apnea–hypopnea syndrome (OSAHS). Sleep Breath 12, 149–154 (2008). https://doi.org/10.1007/s11325-007-0148-4

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