Abstract
Objective
To determine the diagnostic characteristics of poor visualisation of nigrosome-1 as a neuroimaging biomarker in Parkinson’s disease (PD) and to explore the relationship of poor visualisation of nigrosome-1 and clinical asymmetry.
Methods
High-resolution gradient-echo sequences of 67 patients with PD and 63 healthy controls were reviewed by two radiologists blinded to the clinical details. A three-tier classification system was used to categorise the scans based on the visualisation of nigrosome-1, and inter-rater reliability was calculated at each level of classification. Other diagnostic properties such as sensitivity, specificity and predictive values were calculated. The relationship between poor visualisation of nigrosome-1 and clinical asymmetry was also assessed.
Results
Poor visualisation of nigrosome-1 had high sensitivity (98.5%), specificity (93.6%), positive-predictive value (94.3%), negative-predictive value (98.3%), accuracy (96%) and inter-rater reliability (k = 0.75–0.92). Poorly visualised nigrosome-1 was significantly associated with higher motor asymmetry in the contralateral side in 64.8% of subjects (p = 0.004).
Conclusions
Poor visualisation of nigrosome-1 in PD had good diagnostic properties as a neuroimaging biomarker in PD. There was also a significant agreement on clinical asymmetry and poor visualisation of nigrosome-1.
Key Points
• Nigrosome-1 represents the largest collection of dopaminergic neurons in dorso-lateral substantia nigra.
• Loss of nigrosome-1 is being studied as a biomarker in Parkinson’s disease.
• Visualisation of nigrosome-1 had good diagnostic properties as a biomarker.
• There was a contralateral relationship between nigrosome-1 lateralisation and clinical asymmetry.
• We also highlight the potential limitations of nigrosome-1 visualisation as a biomarker.
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Abbreviations
- 3D:
-
3-Dimensional space
- Group 1:
-
Well visualised on both sides
- Group 2:
-
Poorly visualised on one or both sides
- Group 2a:
-
Poorly visualised unilaterally
- Group 2a-L:
-
Poorly visualised on left side
- Group 2a-R:
-
Poorly visualised on right side
- Group 2b:
-
Poorly visualised bilaterally
- k:
-
Cohen’s kappa
- MRI:
-
Magnetic resonance imaging
- MSA-P:
-
Multisystem atrophy – Parkinsonian type
- PD:
-
Parkinson’s disease
- PSP:
-
Progressive supranuclear palsy
- SENSE:
-
Sensitivity Encoding for Fast MRI
- SPECT:
-
Single Photon Emission Computed Tomography
- UPDRS III:
-
Unified Parkinson’s Disease Rating Scale part III
- VenoBOLD sequence:
-
Venous blood oxygen level-dependent sequence
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The scientific guarantor of this publication is Dr. Pramod Kumar Pal.
Conflict of interest
The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.
Funding
This work was financially supported by Department of Biotechnology (DBT), Government of India. [Grant Number: NO. BT/PR14315/MED/30/474/2010]
Statistics and biometry
No complex statistical methods were necessary for this paper.
Informed consent
Written informed consent was obtained from all subjects in this study.
Ethical approval
Institutional Review Board approval was obtained.
Study subjects or cohorts overlap
There is overlap of subjects from the following previously published reports/articles:
1. Jha M, Jhunjhunwala K, Sankara BB, Saini J, Kumar JK, Yadav R, Pal PK (2015) Neuropsychological and imaging profile of patients with Parkinson's disease and freezing of gait. Parkinsonism Relat Disord 21(10):1184-90. doi: 10.1016/j.parkreldis.2015.08.009. Epub 2015 Aug 12.
2. Naduthota RM, Bharath RD, Jhunjhunwala K, Yadav R, Saini J, Christopher R, Pal PK (2017) Imaging biomarker correlates with oxidative stress in Parkinson's disease. Neurol India(2017). 65(2):263-268. doi: 10.4103/neuroindia.NI_981_15.
Methodology
• Prospective
• Case-control study
• Performed at one institution
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Stezin, A., Naduthota, R.M., Botta, R. et al. Clinical utility of visualisation of nigrosome-1 in patients with Parkinson’s disease. Eur Radiol 28, 718–726 (2018). https://doi.org/10.1007/s00330-017-4950-5
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DOI: https://doi.org/10.1007/s00330-017-4950-5