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© 1992 Oxford University Press

research-article

Sleep Disordered Breathing and Cognitive Function in a Retirement Village Population

LINDA HAYWARD, ANDREA MANT*, ANN EYLAND, HELEN HEWITT, CATHERINE PURCELL, JANE TURNER, ELIZABETH GOODE, ANN LE COUNT, DIMITY POND and NICHOLAS SAUNDERS

Neurosciences Unit, Selby Centre Perth, Australia
Royal Australian College of General Practitioners Sydney 2000
University of Sydney Sydney
Discipline of Medicine Newcastle University

*Address correspondence to Dr A. Mant, Drug and Alcohol Service, Prince of Wales Hospital, Avoca Street, Randwick, NSW, Australia 2031

Sleep disordered breathing (SDB) may be associated with cognitive dysfunction in non-demented elderly people. A random sample of 96 retirement village residents were given both neuropsychological assessment and overnight sleep monitoring with a portable microprocessor based system (Vitalog PMS-8). Respiratory disturbance index (RDI) was calculated as the number of apnoeas and hypopnoeas per hour of sleep. RDI was not associated with ‘memory’, ‘verbal’, and ‘motor’ factors identified from the analysis of cognitive tests, but was associated with the ‘cerebral efficiency’ factor (R2=0.21, p<0.0001). Seventy-three subjects had repeat neuropsychological tests, median time to follow-up being 17 months. Baseline RDI did not predict changes in scores on the two factors identified from the second analysis.

We conclude that mild to moderate disturbance of breathing during sleep is not associated with cognitive dysfunction in non-demented subjects.

Received August 9, 1991;
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