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Voiding and MRI analysis of the brain
R Sakakibara1, C J Fowler, T Hattori
1National Hospital for Neurology and Neurosurgery, London, UK.
Summary
Frontal lobe strokes significantly impact bladder control, causing urinary dysfunction in most patients. Specific frontal areas are crucial for micturition, and damage can lead to storage and voiding problems.
Area of Science:
- Neuroscience
- Urology
Background:
- Historically, surgery, angiography, and postmortem studies suggested the frontal lobe's role in micturition control.
- Advancements in CT and MRI imaging allow for detailed study of brain lesions and their effects on bodily functions.
Purpose of the Study:
- To investigate the relationship between stroke-induced brain lesions and urinary dysfunction.
- To identify specific brain regions, particularly within the frontal lobe, critical for micturition control.
Main Methods:
- Analysis of neuroimaging (CT and MRI) in patients with hemispheric and brain-stem strokes.
- Correlation of lesion location with observed urinary dysfunction.
- Urodynamic assessment to characterize storage and voiding disorders.
Main Results:
- Urinary dysfunction was prevalent in 68% of patients with frontal lobe lesions, compared to 20% (parietal), 14% (temporal), and 0% (occipital).
- Medial frontal regions, including the prefrontal lobe, cingulate gyrus, paracentral lobule, and orbital area, were identified as key for micturition.
- Observed urodynamic findings included detrusor hyperreflexia, detrusor areflexia, uninhibited sphincter relaxation, and sphincter dyssynergia during voiding.
Conclusions:
- Frontal lobe lesions are strongly associated with significant urinary dysfunction after stroke.
- Specific areas within the frontal lobe are critical for normal bladder storage and voiding.
- The basal ganglia and pons also play a role in human micturition control, warranting further investigation.