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Cognitive Impairments and Subjective Cognitive Complaints in Fabry Disease: A Nationwide Study and Review of the Literature

  • Josefine Loeb
  • Ulla Feldt-Rasmussen
  • Christoffer Valdorff Madsen
  • Asmus Vogel
Research Report
Part of the JIMD Reports book series

Abstract

Fabry disease is a rare progressive X-linked lysosomal storage disorder which leads to neuropathic pain, organ dysfunction and cerebral pathology. Few studies have investigated cognitive impairment in Fabry disease and these previous studies are difficult to compare due to heterogeneous methodological designs and small cohorts. The objective was to investigate the frequency of cognitive impairment in the Danish nationwide cohort of Fabry patients. Further, we examined if subjective cognitive complaints were associated with objective cognitive performances in this patient group. Neuropsychological tests (17 measures) and evaluation of subjective complaints with the Perceived Deficits Questionnaire (PDQ) were applied in 41 of 63 patients. According to an a priori definition, 12 patients (29.3%) were cognitively impaired. Tests tapping psychomotor speed, attention and executive functions had the highest frequency of impairment. In general, disease related variables as Mainz Severity Score Index, enzyme activity and years since onset and depression did not have a significant impact on the categorisation of patients as being cognitively impaired or non-impaired. Thus, cognitive impairment in Fabry disease does not seem to occur solely by having symptoms for many years or by having high disease burden. However, impaired neuropsychological test results were significantly more common in patients with cerebrovascular disease. Only three patients had scores in the abnormal range of the PDQ scale and subjective perceptions of cognition were not associated with cognitive performances. The levels of subjective cognitive complaints were generally very low in the studied patients demonstrating that the absence of subjective cognitive complaints does not exclude the presence of objective cognitive problems.

Keywords

Cognition Fabry disease Memory Neuropsychology Subjective symptoms 

Notes

Acknowledgements

The authors would like to thank the Danish Health Foundation and the Danish Ministry of Health for support to the Danish Dementia Research Centre. The study was supported by an unrestricted research grant from Genzyme. Specialist nurse Ira Hagen is thanked for excellent assistance in the accrual of clinical data from the patients and Casper Kok is thanked for excellent technical assistance. The Danish Fabry Team is thanked for continuous update of Fabry patient data.

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Copyright information

© Society for the Study of Inborn Errors of Metabolism (SSIEM) 2018

Authors and Affiliations

  • Josefine Loeb
    • 1
  • Ulla Feldt-Rasmussen
    • 1
  • Christoffer Valdorff Madsen
    • 1
  • Asmus Vogel
    • 2
    • 3
  1. 1.Department of Medical EndocrinologyRigshospitalet, University of CopenhagenCopenhagenDenmark
  2. 2.Danish Dementia Research Center, Department of NeurologyRigshospitalet, University of CopenhagenCopenhagenDenmark
  3. 3.Department of PsychologyUniversity of CopenhagenCopenhagenDenmark

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