Abstract
Rationale
Betel quid (BQ) is a common addictive substance in many Asian countries. However, few studies have focused on the influences of BQ on the brain. It remains unclear how BQ can affect structural brain abnormalities in BQ chewers.
Objectives
We aimed to use generalized q-sampling imaging (GQI) to evaluate the impact of the neurological structure of white matter caused by BQ.
Methods
The study population comprised 16 BQ chewers, 15 tobacco and alcohol controls, and 17 healthy controls. We used GQI with voxel-based statistical analysis (VBA) to evaluate structural brain and connectivity abnormalities in the BQ chewers compared to the tobacco and alcohol controls and the healthy controls. Graph theoretical analysis (GTA) and network-based statistical (NBS) analysis were also performed to identify the structural network differences among the three groups.
Results
Using GQI, we found increases in diffusion anisotropy in the right anterior cingulate cortex (ACC), the midbrain, the bilateral angular gyrus, the right superior temporal gyrus (rSTG), the bilateral superior occipital gyrus, the left middle occipital gyrus, the bilateral superior and inferior parietal lobule, and the bilateral postcentral and precentral gyrus in the BQ chewers when compared to the tobacco and alcohol controls and the healthy controls. In GTA and NBS analyses, we found more connections in connectivity among the BQ chewers, particularly in the bilateral anterior cingulum.
Conclusions
Our results provided further evidence indicating that BQ chewing may lead to brain structure and connectivity changes in BQ chewers.
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Acknowledgements
The authors appreciate the full support from the Department of Medical Imaging, Chung Shan Medical University Hospital, Taichung, Taiwan. The authors would like to thank Jau-Yang Lin for his assistance in experimental preparation.
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Informed consent was obtained from all participants; the study was approved by the Institutional Review Board of Chung Shan Medical University Hospital. All participants underwent assessment established by psychologists at Chung Shan Medical University, Taichung, Taiwan.
Funding
This study was supported by the research programs NSC103-2420-H-040-001-MY2 and MOST105-2410-H-040-001-MY3, which were sponsored by the Ministry of Science and Technology, Taipei, Taiwan.
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The authors declare that they have no conflict of interest.
Appendix
Appendix
The BNDS consists of the following three factors: craving and desire (e.g., if possible, I may chew BQ right now), withdrawal response (e.g., when BQ is not available, I feel so upset that my work and activities are disturbed), and tasting habits (e.g., I care about types, textures, and the feeling that comes from chewing BQ).The eigenvalues of the three factors accounted for 63.10% of total variances, and α coefficients of reliability were between 0.73 to 0.89. Most of model-fit indexes showed good fitting results (RMSEA = 0.070, SRMR = 0.038, AGFI = 0.90, GFI = 0.94, NFI = 0.97, NNFI = 0.98, CFI = 0.98, IFI = 0.98, RFI = 0.96), suggesting optimal construct validity of the scale. The scale also offered criterion-related validity for reference. For example, the BNDS score correlated positively to the number of days per week on which chewing occurred and the average number of BQ chewed per day. The BNDS score correlated negatively to the extent of willing to quit chewing BQ.
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Weng, JC., Kao, TW., Huang, GJ. et al. Evaluation of structural connectivity changes in betel-quid chewers using generalized q-sampling MRI. Psychopharmacology 234, 1945–1955 (2017). https://doi.org/10.1007/s00213-017-4602-0
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DOI: https://doi.org/10.1007/s00213-017-4602-0