Acute, severe traumatic spinal cord injury: improving urinary bladder function by optimizing spinal cord perfusion.

Area of Science:

• Neuroscience
• Urology
• Trauma Surgery

Background:

• Traumatic spinal cord injury (SCI) significantly impacts urinary bladder function.
• The prevailing view is that the detrusor muscle is initially acontractile after SCI.

Purpose of the Study:

• To investigate the acute effects of severe traumatic SCI on urinary bladder function.
• To test the hypothesis that optimizing spinal cord perfusion pressure (SCPP) improves bladder function post-SCI.

Main Methods:

• 13 adults with traumatic SCI (ASIA grades A-C) underwent intradural placement of a pressure probe and microdialysis catheter at the injury site.
• Spinal cord perfusion pressure was varied, and filling cystometry was performed.
• Patients were followed for an average of 12 months.

Main Results:

• 38 out of 63 fill cycles exhibited unfavorable urodynamics (low compliance, detrusor overactivity, or high end-fill pressure).
• Unfavorable urodynamics correlated with spinal cord hypoperfusion (<60 mm Hg), hyperperfusion (>100 mm Hg), low tissue glucose, and high lactate to pyruvate ratio.
• Increasing SCPP from 67.0 to 92.1 mm Hg significantly reduced the median bladder volume at the first desire to void.
• Initial bladder compliance strongly predicted long-term compliance.

Conclusions:

• Unfavorable bladder urodynamics manifest within days of acute SCI, contradicting the acontractile detrusor theory.
• Acute urodynamic studies can identify patients with low bladder compliance who may benefit from early intervention.
• Bladder function is dynamic in the acute phase and influenced by injury site physiology; optimizing SCPP may improve urological outcomes.