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Temporal Evolution of Poststroke Cognitive Impairment Using the Montreal Cognitive Assessment
Britta Nijsse1, Johanna M A Visser-Meily2, Maria L van Mierlo1
1From the Department of Neurology, Elisabeth-Tweesteden Hospital, Tilburg, The Netherlands (B.N., P.L.M.d.K.); Brain Center Rudolf Magnus and Center of Excellence for Rehabilitation Medicine, University Medical Center Utrecht and Hoogstraat Rehabilitation, The Netherlands (J.M.A.V.-M., M.L.v.M., M.W.M.P.); Department of Rehabilitation Medicine, University Medical Center Groningen, The Netherlands (M.W.M.P.); and Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience (C.M.v.H.) and Department of Neuropsychology and Psychopharmacology, Faculty of Psychology and Neuroscience (C.M.v.H.), Maastricht University, The Netherlands.
Background And Purpose:
The Montreal Cognitive Assessment (MoCA) is nowadays recommended for the screening of poststroke cognitive impairment. However, little is known about the temporal evolution of MoCA-assessed cognition after stroke. The objective of this study was to examine the temporal pattern of overall and domain-specific cognition at 2 and 6 months after stroke using the MoCA and to identify patient groups at risk for cognitive impairment at 6 months after stroke.
Methods:
Prospective cohort study in which 324 patients were administered the MoCA at 2 and 6 months post stroke. Cognitive impairment was defined as MoCA<26. Differences in cognitive impairment rates between 2 and 6 months post stroke were analyzed in different subgroups. Patients with MoCA score <26 at 2 months, who improved by ≥2 points by 6 months, were defined as reverters. Logistic regression analyses were used to identify determinants of (1) cognitive impairment at 6 months post stroke and (2) reverter status.
Results:
Between 2 and 6 months post stroke, mean MoCA score improved from 23.7 (3.9) to 24.7 (3.5), P<0.001. Prevalence of cognitive impairment at 2 months was 66.4%, compared with 51.9% at 6 months (P<0.001). More comorbidity and presence of cognitive impairment at 2 months were significant independent predictors of cognitive impairment 6 months post stroke. No significant determinants of reverter status were identified.
Conclusions:
Although cognitive improvement is seen ≤6 months post stroke, long-term cognitive deficits are prevalent. Identifying patients at risk of cognitive impairment is, therefore, important as well as targeting interventions to this group.
