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Sympathetic skin response in obstructive sleep apnea syndrome

100%
Zakrzewska-Pniewska B., Przybylowski T., Byskiniewicz K., Kostera-Pruszczyk A., Droszcz W., Emeryk-Szajewska B.
Acta Neurobiologiae Experimentalis
|
1998
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vol. 58
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issue 2
113-121
EN
Examination of the sympathetic skin response (SSR), a non-invasive method of studying conduction in the sympathetic nervous system was performed in 15 male patients with obstructive sleep apnea syndrome (OSAS) evaluated by polysomnography who were compared with 7 non-apneic snorers and 26 controls. The aim of the study was to assess sympathetic nervous system function in OSAS, to compare the results with those found in non-apneic heavy snorers, to define the pattern of abnormalities and to study the correlations between SSR results and polysomnographic parameters. In the OSAS group the mean hand latency was significantly longer than in non-apneic snorers and healthy subjects. The most characteristic pattern of abnormalities was an absence of a foot response found in 12 of 15 OSAS patients. There were no correlations between SSR abnormalities and polysomnographic parameters. The SSR method seems to be useful in assessment of the sympathetic nervous system, especially of those parts related to sudomotor function, in OSAS.
2
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Role of hypercapnia in brain oxygenation in sleep-disordered breathing

75%
Brzecka A.
Acta Neurobiologiae Experimentalis
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2007
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vol. 67
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issue 2
197-206
EN
Adaptive mechanisms may diminish the detrimental effects of recurrent nocturnal hypoxia in obstructive sleep apnea (OSA). The potential role of elevated carbon dioxide (CO2) in improving brain oxygenation in the patients with severe OSA syndrome is discussed. CO2 increases oxygen uptake by its influence on the regulation of alveolar ventilation and ventilation-perfusion matching, facilitates oxygen delivery to the tissues by changing the affinity of oxygen to hemoglobin, and increases cerebral blood flow by effects on arterial blood pressure and on cerebral vessels. Recent clinical studies show improved brain oxygenation when hypoxia is combined with hypercapnia. Anti-inflammatory and protective against organ injury properties of CO2 may also have therapeutic importance. These biological effects of hypercapnia may improve brain oxygenation under hypoxic conditions. This may be especially important in patients with severe OSA syndrome.
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