Abstract
Background
There is a paucity of cerebral neuroimaging studies in post-polio syndrome (PPS), despite the severity of neurological and neuropsychological sequelae associated with the condition. Fatigue, poor concentration, limited exercise tolerance, paraesthesia and progressive weakness are frequently reported, but the radiological underpinnings of these symptoms are poorly characterised.
Objective
The aim of this study is to evaluate cortical and subcortical alterations in a cohort of adult polio survivors to explore the anatomical substrate of extra-motor manifestations.
Methods
Thirty-six patients with post-polio syndrome, a disease-control group with amyotrophic lateral sclerosis patients and a cohort of healthy individuals were included in a prospective neuroimaging study with a standardised clinical and radiological protocol. Validated clinical instruments were utilised to assess mood, cognitive and behavioural domains and specific aspects of fatigue. Cortical thickness analyses, subcortical volumetry, brainstem segmentation and region-of-interest (ROI) white matter analyses were undertaken to assess regional grey and white matter alterations.
Results
A high proportion of PPS patients exhibited apathy, verbal fluency deficits and reported self-perceived fatigue. On ROI analyses, cortical atrophy was limited to the cingulate gyrus, and the temporal pole and subcortical atrophy were only detected in the left nucleus accumbens. No FA reductions were noted to indicate white matter degeneration in any of the lobes.
Conclusions
Despite the high incidence of extra-motor manifestations in PPS, only limited cortical, subcortical and white matter degeneration was identified. Our findings suggest that non-structural causes, such as polypharmacy and poor sleep, may contribute to the complex symptomatology of post-polio syndrome.


Data availability
The handling of data is regulated by the REC approval of the study and institutional policies. Additional information on MRI settings and analysis pipelines is available from the corresponding author on request.
Abbreviations
- ALS:
-
Amyotrophic lateral sclerosis
- ALSFRS-r:
-
Revised amyotrophic lateral sclerosis functional rating scale
- ANCOVA:
-
Analysis of covariance
- C9orf72:
-
Chromosome 9 open reading frame 72
- CC:
-
Corpus callosum
- CST:
-
Corticospinal tract(s)
- DTI:
-
Diffusion tensor imaging
- ECAS:
-
Edinburgh cognitive and Behavioural ALS Screen
- EMG:
-
Electromyogram
- EMM:
-
Estimated marginal mean
- FOV:
-
Field of view
- FrSBe:
-
Frontal System Behavioural Scale
- FSL:
-
FMRIB Software Library
- FSL-FAST:
-
FMRIB’s Automated Segmentation Tool
- FSL-FLIRT:
-
FMRIB’s Linear Image Registration Tool
- FSS:
-
Fatigue Severity Scale
- FWE:
-
Familywise error
- GM:
-
Grey matter
- GPEI:
-
Global Polio Eradication Initiative
- HADS:
-
Hospital Anxiety and Depression Scale
- HC:
-
Healthy control
- HSP:
-
Hereditary spastic paraplegia
- IR-SPGR:
-
Inversion recovery prepared spoiled gradient recalled echo
- IR-TSE:
-
Inversion recovery turbo spin echo sequence
- LEoP:
-
Late effects of polio
- LOSP:
-
Late-onset sequelae of poliomyelitis
- Lt:
-
Left
- LL: :
-
Lower limb
- LMN:
-
Lower motor neuron
- MANCOVA:
-
Multivariate analysis of covariance
- MNI152:
-
Montreal Neurological Institute 152 standard space
- PFS:
-
Piper Fatigue Scale
- PLS:
-
Primary lateral sclerosis
- PPS:
-
Post-polio syndrome
- Rt:
-
Right
- ROI:
-
Region of interest
- SD:
-
Standard deviation
- SE-EPI:
-
Spin-echo echo planar imaging
- SENSE:
-
Sensitivity encoding
- SPIR:
-
Spectral presaturation with inversion recovery
- SSRI:
-
Selective serotonin reuptake inhibitors
- T1W:
-
T1-weighted imaging
- TE:
-
Echo time
- TFCE:
-
Threshold-free cluster enhancement
- TI:
-
Inversion time
- TIV:
-
Total intracranial volume
- TR:
-
Repetition time
- UL:
-
Upper limb
- UMN:
-
Upper motor neuron
- WPV:
-
Wild poliovirus
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Acknowledgements
We acknowledge all patients with post-polio syndrome and the healthy controls for agreeing to participate in this research study. Without their contribution, this study would not have been possible.
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Funding
This study was supported by the Health Research Board (HRB EIA-2017-019), the Spastic Paraplegia Foundation, Inc. (SPF), the EU Joint Programme–Neurodegenerative Disease Research (JPND), the Andrew Lydon scholarship and the Irish Institute of Clinical Neuroscience (IICN), the Iris O'Brien Foundation.
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Conceptualisation of the study, drafting the manuscript: SLHS, PB
Neuroimaging analyses: SLHS, JL, PB
Clinical assessments: SLHS, OH, RC
Revisions of the manuscript for intellectual content: SLHS, JL, RC, OH, PB
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The study was approved by the Ethics (Medical Research) Committee—Beaumont Hospital, Dublin, Ireland.
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The authors declare no competing interests.
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Li Hi Shing, S., Lope, J., Chipika, R.H. et al. Extra-motor manifestations in post-polio syndrome (PPS): fatigue, cognitive symptoms and radiological features. Neurol Sci 42, 4569–4581 (2021). https://doi.org/10.1007/s10072-021-05130-4
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DOI: https://doi.org/10.1007/s10072-021-05130-4