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J Neurol Neurosurg Psychiatry. 2018 Sep;89(9):995-1002. doi: 10.1136/jnnp-2017-317459. Epub 2018 Feb 9.

The cognitive profile of behavioural variant FTD and its similarities with ALS: a systematic review and meta-analysis.

Author information

1
Department of Neurology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
2
Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Centre, Nijmegen, The Netherlands.
3
Department of Neurology, VU medical center, VU University, Amsterdam, The Netherlands.
4
Clinical Research Unit, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
5
Department of Medical Psychology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.

Abstract

Approximately 30% of patients with amyotrophic lateral sclerosis (ALS) have cognitive impairment and 8%-14% fulfil the criteria for behavioural variant frontotemporal dementia (bv-FTD). The cognitive profiles of ALS and bv-FTD have been reported to be comparable, but this has never been systematically investigated. We aimed to determine the cognitive profile of bv-FTD and examine its similarities with that of ALS, to provide evidence for the existence of a cognitive disease continuum encompassing bv-FTD and ALS. We therefore systematically reviewed neuropsychological studies on bv-FTD patients and healthy volunteers. Neuropsychological tests were divided in 10 cognitive domains and effect sizes were calculated for all domains and compared with the cognitive profile of ALS by means of a visual comparison and a Pearson's r correlation coefficient. We included 120 studies, totalling 2425 bv-FTD patients and 2798 healthy controls. All cognitive domains showed substantial effect sizes, indicating cognitive impairment in bv-FTD patients compared to healthy controls. The cognitive domains with the largest effect sizes were social cognition, verbal memory and fluency (1.77-1.53). The cognitive profiles of bv-FTD and ALS (10 cognitive domains, 1287 patients) showed similarities on visual comparison and a moderate correlation 0.58 (p=0.13). When social cognition, verbal memory, fluency, executive functions, language and visuoperception were considered, i.e. the cognitive profile of ALS, Pearson's r was 0.73 (p=0.09), which raised to 0.92 (p=0.03), when language was excluded in this systematic analysis of patients with a non-language subtype of FTD. The cognitive profile of bv-FTD consists of deficits in social cognition, verbal memory, fluency and executive functions and shows similarities with the cognitive profile of ALS. These findings support a cognitive continuum encompassing ALS and bv-FTD.

KEYWORDS:

cognition; frontotemporal dementia; motor neuron disease

PMID:
29439163
DOI:
10.1136/jnnp-2017-317459

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