Source: Annual Congress 2008 - Assessment of sleep apnoea
Disease area: Sleep and breathing disorders

Abstract

Introduction
Hypoxia and sleep fragmentation as the result of recurrent apnoea-related episodes in obstructive sleep apnoea syndrome (OSA) have possible impact on mental performance such as memory and concentration. Increased traffic accidents has been observed in OSA patients. Patients often complain on concentration problems, sleepiness.
Methods
Patients diagnosed with OSA completed Epworth Sleepiness scale (SSE) and neuropsychology diagnostic has been done based on Benton Visual Retention Test (postpomenent visual memory and perception), Bender – Gestalt Test (visual perception, coordination), Number Repeating Test (NRT) based on Wechsler –R (auditory verbal memory).
Results
58 OSA patients (mean age 53; SD 10,1) were involved in the study. Correlation has been found between the number of mistakes in Benton Test and AHI (r=0.53; p=0.0001) and between minimal saturation (r=-0,31; p=0,038). Correlation also has been observed between Bender-Gestalt Test results and AHI (r=0,36; p=0,01) and minimal saturation (r=0,35;p=0,01). No correlations have been found between results of Benton and Bender Tests and SSE. Results of NRT didn‘t show any correlations. Qualitative analysis of mistakes both Benton and Bender-Gestalt Tests didn‘t suggest any organic changes of the brain.
Conclusions
AHI and minimal saturation seems to be more important predictor of memory dysfunction than sleepiness scale results. Specific tests, specially used in neuropsychological diagnosis, could be useful in the diagnosis of memory perception disorders and treatment effectiveness assessment in OSA patients.

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Citations should be made in the following way:
M. Farnik, W. Pierzchala (Katowice, Poland). Impact of sleep apnoea syndrome on perception and memory. Eur Respir J 2008; 32: Suppl. 52, 825

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