Volume 33, Issue 5 pp. 493-501
Clinical Practice

Examining mechanisms of brain control of bladder function with resting state functional connectivity MRI†,

Rahel Nardos

Corresponding Author

Rahel Nardos

Oregon Health and Science University, Portland, Oregon

Kaiser Permanente, Clackamas, Oregon

Correspondence to: Rahel Nardos, Mail Code: L466, 3181 S.W. Sam Jackson Park Rd., Portland, OR 97239-3107. E-mail: [email protected]Search for more papers by this author
William Thomas Gregory

William Thomas Gregory

Oregon Health and Science University, Portland, Oregon

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Christine Krisky

Christine Krisky

Oregon Health and Science University, Portland, Oregon

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Amanda Newell

Amanda Newell

Oregon Health and Science University, Portland, Oregon

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Binyam Nardos

Binyam Nardos

Washington University

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Bradley Schlaggar

Bradley Schlaggar

Washington University

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Damien A. Fair

Damien A. Fair

Oregon Health and Science University, Portland, Oregon

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First published: 03 July 2013
Citations: 31
Dirk De Ridder led the peer-review process as the Associate Editor responsible for the paper.
Conflict of interest: none.

Abstract

Aims

This aim of this study is to identify the brain mechanisms involved in bladder control.

Methods

We used fMRI to identify brain regions that are activated during bladder filling. We then used resting state connectivity fMRI (rs-fcMRI) to assess functional connectivity of regions identified by fMRI with the rest of the brain as the bladder is filled to capacity.

Results

Female participants (n = 20) were between ages 40 and 64 with no significant history of symptomatic urinary incontinence. Main effect of time (MET) fMRI analysis resulted in 20 regions of interest (ROIs) that have significant change in BOLD signal (z = 3.25, P <0.05) over the course of subtle bladder filling and emptying regardless of full versus empty bladder state. Bladder-state by time (BST) fMRI analysis resulted in three ROIs that have significant change in BOLD signal (z = 3.25, P <0.05) over the course of bladder runs comparing full versus empty bladder state. Rs-fcMRI fixed effects analysis identified significant changes in connectivity between full and empty bladder states in seven brain regions (z = 4.0) using the three BST ROIs and sixteen brain regions (z = 7) using the twenty MET ROIs. Regions identified include medial frontal gyrus, posterior cingulate (PCC), inferiolateral temporal and post-central gyrus, amygdale, the caudate, inferior parietal lobe as well as anterior and middle cingulate gyrus.

Conclusions

There is significant and vast changes in the brain's functional connectivity when bladder is filled suggesting that the central process responsible for the increased control during the full bladder state appears to largely rely on the how distributed brain systems are functionally integrated. Neurourol. Urodynam. 33:493–501, 2014. © 2013 Wiley Periodicals, Inc.

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