Abnormal respiratory-related evoked potentials in untreated awake patients with severe obstructive sleep apnoea syndrome.

Abstract:

AIM:Obstructive sleep apnoeas generate an intense afferent traffic leading to arousal and apnoea termination. Yet a decrease in the sensitivity of the afferents has been described in patients with obstructive sleep apnoea, and could be a determinant of disease severity. How mechanical changes within the respiratory system are processed in the brain can be studied through the analysis of airway occlusion-related respiratory-related evoked potentials. Respiratory-related evoked potentials have been found altered during sleep in mild and moderate obstructive sleep apnoea syndrome, with contradictory results during wake. We hypothesized that respiratory-related evoked potentials' alterations during wake, if indeed a feature of the obstructive sleep apnoea syndrome, should be present in untreated severe patients. METHODS:Ten untreated patients with severe obstructive sleep apnoea syndrome and eight matched controls were studied. Respiratory-related evoked potentials were recorded in Cz-C3 and Cz-C4, and described in terms of the amplitudes and latencies of their components P1, N1, P2 and N2. RESULTS:Components amplitudes were similar in both groups. There was no significant difference in P1 latencies. This was also the case for N1 in Cz-C3. In contrast, N1 latencies in Cz-C4 were significantly longer in patients with obstructive sleep apnoea syndrome [median 98 ms (interquartile range 16.00) versus 79.5 ms (5.98), P = 0.015]. P2 and N2 were also significantly delayed, on both sides. CONCLUSIONS:The cortical processing of airway occlusion-related afferents seems abnormal in untreated patients with severe obstructive sleep apnoea syndrome. This could be either a severity marker and/or an aggravating factor.

authors

Donzel-Raynaud C,Redolfi S,Arnulf I,Similowski T,Straus C

doi

10.1111/j.1475-097X.2008.00830.x

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

10-7

issue

1

eissn

1475-0961

issn

1475-097X

pii

CPF830

journal_volume

29

pub_type

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