[Evaluation of cerebral hemodynamics in patients with syndrome of obstructive sleep apnea by long term registration of rheoencephalogram]. / Otsenka mozgovoi gemodinamiki u patsientov s sindromom obstruktivnogo apnoé sna metodom dlitel'noi registratsii reoéntsefalogrammy vo sne.

AIM: To assess cerebral hemodynamics during sleep in patients with syndrome of obstructive sleep apnea. METHODS: Long term monitoring of rheoencephalogram. Data processing consisted in construction of trends (curves of changes of rheographical parameters during any selected time interval). RESULTS AND CONCLUSION: Cyclical periods of apnea are associated with negative changes of cerebral hemodynamics. At the end of period of apnea despite compensatory vasodilatation cerebral blood flow decreases. This occurs during pronounced hypoxemia and can predispose to ischemic disturbances. In ventilation phase rapid rise of heart rate and blood pressure at the background of continuing cerebral vasodilatation can increase risk of hemorrhagic complications.