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The Integrity of the Substructure of the Corpus Callosum in Patients With Right Classic Trigeminal Neuralgia. J Craniofac Surg 2021; 32:632-636. [PMID: 33704998 DOI: 10.1097/scs.0000000000007082] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
OBJECTIVE Patients with classic trigeminal neuralgia (CTN) have abnormalities in white matter integrity of the corpus callosum (CC). However, in CTN patients, it is unclear whether the CC substructure region is affected to varying degrees. MATERIAL AND METHODS A total of 22 patients with CTN and 22 healthy controls (HC) with matching age, gender, and education were selected. All subjects underwent 3.0 T magnetic resonance diffusion tensor imaging and high resolution T1-weighted imaging. The CC was reconstructed by DTI technology, which was divided into three substructure regions: genu, body, and splenium. Group differences in multiple diffusion metrics, including fractional anisotropy (FA), mean diffusivity (MD), axial diffusivity (AD) and radial diffusivity (RD), were compared between CTN patients and HC, and correlations between the white matter change and disease duration and VAS in CTN patients were assessed. RESULTS Compared with HC group, CTN patients had extensive damage to the CC white matter. The FA of the genu (P = 0.04) and body (P = 001) parts decreased, while RD (P = 0.003; P = 0.02) and MD (P = 0.002; P = 0.04) increased. In addition, the authors observed that the disease duration and VAS of CTN patients were negatively correlated with FA. CONCLUSION The corpus callosum substructure region has extensive damage in chronic pain, and the selective microstructural integrity damage was particularly manifested by changes in axons and myelin sheath in the genu and body of corpus callosum.
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Larsson MBO, Tillisch K, Craig A(B, Engström M, Labus J, Naliboff B, Lundberg P, Ström M, Mayer EA, Walter SA. Brain responses to visceral stimuli reflect visceral sensitivity thresholds in patients with irritable bowel syndrome. Gastroenterology 2012; 142:463-472.e3. [PMID: 22108191 PMCID: PMC3288538 DOI: 10.1053/j.gastro.2011.11.022] [Citation(s) in RCA: 129] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Revised: 10/31/2011] [Accepted: 11/02/2011] [Indexed: 12/12/2022]
Abstract
BACKGROUND & AIMS Only a fraction of patients with irritable bowel syndrome (IBS) have increased perceptual sensitivity to rectal distension, indicating differences in processing and/or modulation of visceral afferent signals. We investigated the brain mechanisms of these perceptual differences. METHODS We analyzed data from 44 women with IBS and 20 female healthy subjects (controls). IBS symptom severity was determined by a severity scoring system. Anxiety and depression symptoms were assessed using the hospital anxiety and depression score. Blood oxygen level-dependent signals were measured by functional magnetic resonance imaging during expectation and delivery of high (45 mmHg) and low (15 mmHg) intensity rectal distensions. Perception thresholds to rectal distension were determined in the scanner. Brain imaging data were compared among 18 normosensitive and 15 hypersensitive patients with IBS and 18 controls. Results were reported significant if peak P-values were ≤.05, with family-wise error correction in regions of interest. RESULTS The subgroups of patients with IBS were similar in age, symptom duration, psychological symptoms, and IBS symptom severity. Although brain responses to distension were similar between normosensitive patients and controls, hypersensitive patients with IBS had greater activation of insula and reduced deactivation in pregenual anterior cingulate cortex during noxious rectal distensions, compared to controls and normosensitive patients with IBS. During expectation of rectal distension, normosensitive patients with IBS had more activation in right hippocampus than controls. CONCLUSIONS Despite similarities in symptoms, hyper- and normosensitive patients with IBS differ in cerebral responses to standardized rectal distensions and their expectation, consistent with differences in ascending visceral afferent input.
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Affiliation(s)
- MBO Larsson
- Department of Clinical and Experimental Medicine/Gastroenterology, Center for Medical Image Science and Visualization (CMIV), Linköping University; Department of Gastroenterology, UHL, County Council of Östergötland, Linköping, Sweden
| | - K Tillisch
- Oppenheimer Family Center for Neurobiology of Stress, Division of Digestive, Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, USA
| | - A.D. (Bud) Craig
- Barrow Neurological Institute, Phoenix, AZ, USA; Visiting Professor at the Department of Clinical and Experimental Medicine, Linköping University, Sweden
| | - M Engström
- Department of Medical and Health Sciences (IMH)/Radiology, Linköping University, Sweden; Center for Medical Image Science and Visualization (CMIV), Linköping University, Sweden
| | - J Labus
- Oppenheimer Family Center for Neurobiology of Stress, Department of Psychiatry, David Geffen School of Medicine at UCLA, Los Angeles, USA
| | - B Naliboff
- Oppenheimer Family Center for Neurobiology of Stress, Department of Psychiatry, David Geffen School of Medicine at UCLA, Los Angeles, USA
| | - P Lundberg
- Center for Medical Image Science and Visualization, CMIV; Radiation Physics, Department of Medical and Health Sciences, Faculty of Health Sciences, Linköping University; Department of Radiation Physics UHL, County Council of Östergötland, Linköping, Sweden; Center for Medical Image Science and Visualization, CMIV; Radiology, Department of Medical and Health Sciences, Faculty of Health Sciences, Linköping University; Department of Radiology UHL, County Council of Östergötland, Linköping, Sweden
| | - M Ström
- Department of Clinical and Experimental Medicine/Gastroenterology, Linköping University; Department of Gastroenterology, UHL, County Council of Östergötland, Linköping, Sweden
| | - EA Mayer
- Oppenheimer Family Center for Neurobiology of Stress, Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, USA
| | - SA Walter
- Department of Clinical and Experimental Medicine/Gastroenterology, Center for Medical Image Science and Visualization (CMIV), Linköping University; Department of Gastroenterology, UHL, County Council of Östergötland, Linköping, Sweden
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Effects of inducible nitric oxide synthase blockade within the periaqueductal gray on cardiovascular responses during mechanical, heat, and cold nociception. Neurol Sci 2011; 33:69-78. [DOI: 10.1007/s10072-011-0661-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2011] [Accepted: 06/10/2011] [Indexed: 12/20/2022]
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Flor H, Petzke F. Was leisten die Ergebnisse der Bildgebung für die Schmerztherapie? Schmerz 2010; 24:103-4. [DOI: 10.1007/s00482-010-0897-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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