Journal article
A BI-DIRECTIONAL ASSESSMENT OF THE HUMAN BRAIN-ANORECTAL AXIS
Neurogastroenterology and motility, Vol.23(3), pp.240-e118
03/2011
DOI: 10.1111/j.1365-2982.2010.01619.x
PMCID: PMC3035753
PMID: 20964791
Abstract
Background Brain-gut dysfunction has been implicated in gastrointestinal disorders but a comprehensive test of brain-gut axis is lacking. We developed and tested a novel method for assessing both afferent anorectal-brain function using cortical evoked potentials (CEP), and efferent brain-anorectal function using motor evoked potentials (MEP).
Methods Cortical evoked potentials was assessed following electrical stimulations of anus and rectum with bipolar electrodes in 26 healthy subjects. Anorectal MEPs were recorded following transcranial magnetic stimulation (TMS) over paramedian motor cortices bilaterally. Anal and rectal latencies/amplitudes for CEP and MEP responses and thresholds for first sensation and pain (mA) were analyzed and compared. Reproducibility and interobserver agreement of responses were examined.
Key Results Reproducible polyphasic rectal and anal CEPs were recorded in all subjects, without gender differences, and with negative correlation between BMI and CEP amplitude (r −0.66, P = 0.001). Transcranial magnetic stimulation evoked triphasic rectal and anal MEPs, without gender differences. Reproducibility for CEP and MEP was excellent (CV <10%). The inter-rater CV for anal and rectal MEPs was excellent (ICC 97–99), although there was inter-subject variation.
Conclusions & Inferences Combined CEP and MEP studies offer a simple, inexpensive and valid method of examining bidirectional brain-anorectal axes. This comprehensive method could provide mechanistic insights into lower gut disorders.
Details
- Title: Subtitle
- A BI-DIRECTIONAL ASSESSMENT OF THE HUMAN BRAIN-ANORECTAL AXIS
- Creators
- Jose M Remes-Troche - Division of Neurogastroenterology and Motility, Department of Internal Medicine and Clinical Translational Research Center, University of Iowa Carver College of MedicineKasaya Tantiphlachiva - Division of Neurogastroenterology and Motility, Department of Internal Medicine and Clinical Translational Research Center, University of Iowa Carver College of MedicineAshok Attaluri - Division of Neurogastroenterology and Motility, Department of Internal Medicine and Clinical Translational Research Center, University of Iowa Carver College of MedicineJessica Valestin - Division of Neurogastroenterology and Motility, Department of Internal Medicine and Clinical Translational Research Center, University of Iowa Carver College of MedicineThoru Yamada - Department of Neurology, University of Iowa Carver College of MedicineShaheen Hamdy - School of Translational Medicine, Department of Gastrointestinal Sciences, Hope Hospital, The University of Manchester, United KingdomSatish S.C Rao - Division of Neurogastroenterology and Motility, Department of Internal Medicine and Clinical Translational Research Center, University of Iowa Carver College of Medicine
- Resource Type
- Journal article
- Publication Details
- Neurogastroenterology and motility, Vol.23(3), pp.240-e118
- DOI
- 10.1111/j.1365-2982.2010.01619.x
- PMID
- 20964791
- PMCID
- PMC3035753
- ISSN
- 1350-1925
- eISSN
- 1365-2982
- Language
- English
- Date published
- 03/2011
- Academic Unit
- Neurology
- Record Identifier
- 9984020626802771
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