Near-infrared spectroscopy(NIRS)as a useful tool to evaluate the treatment efficacy of positive airways pressure therapy in patients with obstructive sleep apnea syndrome(OSAS):A pilot study

摘要

In obstructive sleep apnea syndrome(OSA)the periodic reduction or cessation of breathing dueto narrowing or occlusion of the upper airway during slep leads to an impaired cerebral vascularautoregulation that is associated with an increased cardiovascular risk,including stroke.Con-tinuous positive airways pressure(CPAP)therapy at night is the most effective treatment forOSA and has been shown to reduce the cardiovascular risk in OSA patients.However,there is nosuitable bedside monitoring method evaluating the recovery of cerebral hemodynamics duringCPAP therapy.Near-infrared spectroscopy(NiRS)is idelly suited for non-invasive monitoringthe cerebral hemodynamics during sleep due to its properties of local measurement,totally sa feapplication and good tolerance to motion.In this pilot study,we monitored cerebral hemody-namics during standard CPAP therapy at night in thre patients with severe OSA using NIRS.We found periodic oscllations in HbO2,HHb,tisue oxygenation index(TO1)and blood volume(BV)associa ted with periodic apnea events without CPAP in all OSA patients.These osillationswere eliminated under the optimal CPAP pressures in all patients.These results sugg ested thatthe recovery of cerebral hemodynamics impaired by apnea events can be evaluated by bedsideNIRS measurements in real time during ll night CPAP therapy.NIRS is a usefi bedsidemonitoring tool to evaluate the treatment elicacy of CPAP therapy in patients with OSA.