The cognitive phenotypes of Creutzfeldt-Jakob disease: comparison with secondary metabolic encephalopathy

• Published in: Neurological sciences Vol. 43; no. 6; pp. 3703 - 3716
• Main Authors: Giovagnoli, Anna Rita, Di Fede, Giuseppe, Rossi, Giacomina, Moda, Fabio, Grisoli, Marina, Bugiani, Orso
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.06.2022; Springer Nature B.V
• Subjects: Cerebrospinal fluid; Cognitive ability; Computed tomography; Creutzfeldt-Jakob disease; Dementia; Dementia disorders; Encephalopathy; Gene polymorphism; Long term memory; Magnetic resonance imaging; Medicine; Medicine & Public Health; Metabolic disorders; Metabolism; Neuroimaging; Neurology; Neuropsychology; Neuroradiology; Neurosciences; Neurosurgery; Original Article; Patients; Phenotypes; Prion protein; Psychiatry; Single photon emission computed tomography; Ataxia; Fronto-temporal dysfunction; Secondary metabolic encephalopathy; Cognitive phenotype; Creutzfeldt-Jakob disease
• ISSN: 1590-1874; 1590-3478; 1590-3478
• DOI: 10.1007/s10072-021-05795-x

Background Rapidly progressive cognitive impairment is a diagnostic criterion in Creutzfeldt-Jakob disease (CJD), but the diagnosis is usually reached when an analysis of cognitive aspects is no longer possible. Objective This study aims to delineate the cognitive phenotypes preceding severe dementia in CJD compared to secondary metabolic encephalopathies (SME) with rapid cognitive impairment. Methods Patients with rapidly progressive neurological symptoms underwent neuropsychological evaluation, analysis of cerebrospinal fluid (CSF) and codon 129 polymorphism of the prion protein gene ( PRNP ), magnetic resonance imaging (MRI), and single positron emission computed tomography ( 99mTc SPECT). CSF real-time quaking-induced conversion analysis was applied in CJD patients. Based on literature and clinical expertise, cognitive profiles were correlated with brain areas. Results Thirty-one patients were diagnosed with CJD ( n  = 17) or SME; 77 cases of CJD were extracted from the literature. In patients with CJD, verbal initiative, lexical search, long-term memory, attention, and abstract reasoning were the most frequently impaired abilities. Cognitive profiles were mainly related to dysfunction in fronto-temporal areas. Furthermore, they were consistent with areas of hypoperfusion detected by 99mTc SPECT in six patients and cortical and subcortical MRI hyperintensities in eight and 14 patients, respectively, and were similar to those described in the literature. In contrast, cognitive profiles were different from those in SME characterized by visuospatial and constructive deficits relating to posterior brain areas. Conclusion In CJD, clinical and neuropsychological analyses outline a salient cognitive phenotype suggestive of fronto-temporal dysfunction preceding severe dementia. This phenotype is different from that observed in other rapidly progressive encephalopathies.