Electrical stimulation of sacral dermatomes can suppress aberrant urethral reflexes in felines with chronic spinal cord injury.

Abstract:

AIMS:Uncoordinated reflex contractions of the external urethral sphincter (EUS) are a major component of voiding dysfunction after neurologic injury. Patterned stimulation of sacral afferent pathways can reduce abnormal EUS reflexes after acute spinal cord injury (SCI); however, effectiveness following chronic SCI is unknown. METHODS:Four adult male cats were implanted with bilateral extradural sacral root electrodes to allow bladder activation and underwent subsequent spinal transection (T10-12). Nine weeks after SCI urethral and bladder pressures were recorded with and without sacral afferent stimulation. Surface electrodes were applied to sacral and lumbar dermatomes and stimulus amplitude set below the muscle fasciculation threshold. The stimulation pattern was varied by on/off times of fixed frequency at each location. RESULTS:Reflexive EUS contractions were observed in all animals after chronic SCI. Patterned sacral dermatome stimulation reduced EUS reflex rate and amplitude in two of four cats. Suppression was dependent on both the stimulus location and pattern. Sacral locations and a stimulation pattern of (0.75 sec on, 0.25 sec off, 20 Hz) were effective in both responder animals. CONCLUSIONS:Patterned sacral dermatome stimulation can reduce abnormal urethral reflexes following chronic SCI. Reflex suppression is dependent on both the stimulation location and stimulus pattern. Reduction of reflexive EUS activity after chronic SCI with this non-destructive and non-invasive approach may provide an advance for the treatment of detrusor-sphincter-dyssynergia.

journal_name

Neurourol Urodyn

authors

McCoin JL,Bhadra N,Gustafson KJ

doi

10.1002/nau.22276

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

92-7

issue

1

eissn

0733-2467

issn

1520-6777

journal_volume

32

pub_type

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