Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-34191
Pizza, F; Biallas, M; Wolf, M; Werth, E; Bassetti, C L (2010). Nocturnal cerebral hemodynamics in snorers and in patients with obstructive sleep apnea: a near-infrared spectroscopy study. Sleep, 33(2):205-210.
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STUDY OBJECTIVES: Sleep disordered breathing (SDB) of the obstructive type causes hemodynamic consequences, leading to an increased cerebrovascular risk. The severity of SDB at which detrimental circulatory consequences appear is matter of controversy. Aim of the present study is the investigation of cerebral hemodynamics in patients with SDB of variable severity using near-infrared spectroscopy (NIRS). DESIGN: N/A. SETTING: Sleep laboratory. PATIENTS OR PARTICIPANTS: Nineteen patients with SDB. INTERVENTIONS: N/A. MEASUREMENTS AND RESULTS: Patients underwent nocturnal videopolysomnography (VPSG) coupled with cerebral NIRS. NIRS data were averaged for each patient, and a new method (integral) was applied to quantify cerebral hemodynamic alterations. Nocturnal VPSG disclosed various severities of SDB: snoring (7 patients, apnea-hypopnea index [AHI] = 2 +/- 2/h, range: 0.5-4.5); mild SDB (7 patients, AHI = 14 +/- 8/h, range: 6.3-28.6); and severe obstructive sleep apnea syndrome (5 patients, AHI = 79 +/- 20/h, range: 39.6-92.9). Relative changes of NIRS parameters were significantly larger during obstructive apneas (compared with hypopneas; mean deoxygenated hemoglobin [HHb] change of 0.72 +/- 0.23 and 0.13 +/- 0.08 micromol/L per sec, p value = 0.048) and in patients with severe SDB (as compared with patients with mild SDB and simple snorers; mean HHb change of 0.84 +/- 0.24, 0.02 +/- 0.09, and 0.2 +/- 0.08 micromol/L per sec, respectively, p value = 0.020). In this group, NIRS and concomitant changes in peripheral oxygen saturation correlated. CONCLUSIONS: The results of this study suggest that acute cerebral hemodynamic consequences of SDB lead to a failure of autoregulatory mechanisms with brain hypoxia only in the presence of frequent apneas (AHI > 30) and obstructive events.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||04 Faculty of Medicine > University Hospital Zurich > Clinic for Neonatology|
04 Faculty of Medicine > University Hospital Zurich > Clinic for Neurology
|DDC:||610 Medicine & health|
|Deposited On:||26 May 2010 10:36|
|Last Modified:||22 Dec 2012 18:05|
|Publisher:||Associated Professional Sleep Societies, LLC|
|Free access at:||PubMed ID. An embargo period may apply.|
|WoS Citation Count:||8|
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