Abstract
Introduction
Whether different mechanisms, particularly ocular pathology, could lead to the emergence of visual hallucinations (VH) (defined as false perceptions with no external stimulus) versus visual illusions (VI) (defined as a misperception of a real stimulus) in Parkinson’s disease (PD) remains debated. We assessed retinal, clinical and structural brain characteristics depending on the presence of VH or VI in PD.
Methods
In this case–control study, we compared retinal thickness using optical coherence tomography (OCT), between PD patients with: VI (PD-I; n = 26), VH (PD-H; n = 28), and without VI or VH (PD-C; n = 28), and assessed demographic data, disease severity, treatment, anatomical and functional visual complaints, cognitive and visuo-perceptive functions and MRI brain volumetry for each group of PD patients.
Results
Parafoveal retina was thinner in PD-H compared to PD-C (p = 0.005) and PD-I (p = 0.009) but did not differ between PD-I and PD-C (p = 0.85). Multivariate analysis showed that 1/retinal parafoveal thinning and total brain gray matter atrophy were independently associated with the presence of VH compared to PD-I; 2/retinal parafoveal thickness, PD duration, sleep quality impairment and total brain gray matter volume were independent factors associated with the presence of VH compared to PD-C; 3/anterior ocular abnormalities were the only factor independently associated with the presence of illusions compared to PD-C.
Conclusion
These findings reinforce the hypothesis that there may be different mechanisms contributing to VH and VI in PD, suggesting that these two entities may also have a different prognosis rather than simply lying along a continuous spectrum.
Registration number
Clinicaltrials.gov number NCT01114321.
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Acknowledgements
The authors gratefully acknowledge Anna Sontheimer for her advices in MRI morphometric statistical analysis, Stacey West for English language editing, and participants and caregivers who contributed to this study for their commitment. The authors also acknowledge Fondation de France who supported this work (Grant no. 76354).
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Statistical analysis conducted by: BP and CL; Clermont-Ferrand University Hospital, Biostatistics Department, Clermont-Ferrand, France.
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Ana Marques, Steven Beze, Bruno Pereira, Carine Chassain, Nathalie Monneyron, Laure Delaby, Celine Lambert, Marie Fontaine, Philippe Derost, Bérengère Debilly, Isabelle Rieu, Simon Lewis, Frédéric Chiambaretta, Franck Durif—report no disclosures.
Ethical statement
The protocol was approved by the South-West and Overseas II ethical committee, France (clinicaltrials.gov number NTC03454269).
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All patients gave their written informed consent as per the Declaration of Helsinki.
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415_2020_9925_MOESM5_ESM.tiff
Supplementary file5 Sample segmented image from a PD-C subject. Sagittal, coronal and axial images show typical automated subcortical segmentation results from Freesurfer. Different brain regions are indicated by different colors, for example hippocampus appears in gold, putamen in pink, and caudate and pallidum in two different shades of light blue. Total volumes are automatically extracted for each label, with separate values for left and right hemisphere in most structures. (TIFF 246 kb)
415_2020_9925_MOESM6_ESM.tiff
Supplementary file6 Heatmap representation of correlation coefficients between brain volumes, retinal thickness and clinical data. Correlation coefficients (Spearman r) are color-coded as shown on the Horizontal bar on top of the figure. UPDRS: Unified Parkinson Disease Rating Scale; LED: levodopa equivalent dose; DA: dopamine agonists; PDSS: Parkinson disease scale; SCOPA-PC: Scales for outcomes in Parkinson’s disease - Psychiatric complications; PSAS: psychiatric symptom assessment scale; UM-PDHQ: university of Miami Parkinson’s disease hallucinations questionnaire. (TIFF 2703 kb)
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Marques, A., Beze, S., Pereira, B. et al. Visual hallucinations and illusions in Parkinson’s disease: the role of ocular pathology. J Neurol 267, 2829–2841 (2020). https://doi.org/10.1007/s00415-020-09925-x
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DOI: https://doi.org/10.1007/s00415-020-09925-x