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Intraoperative urodynamics in spinal cord surgery: a study of feasibility
M Schaan1, B Boszczyk, H Jaksche
1Department of Neurosurgery, Unfallklinik Murnau, Prof. Küntscher Strasse 8, 82418 Murnau, Germany. mschaan@bgu-murnau.de
Summary
Intraoperative monitoring (IOM) of bladder function during spinal cord surgery using urodynamics and EMG effectively identifies bladder efferents in cauda equina tumor patients. This method aids in understanding bladder dysfunction during surgery.
Area of Science:
- Neurosurgery
- Urology
- Neurophysiology
Background:
- Intraoperative monitoring (IOM) of bladder function in spinal cord surgery presents challenges due to complex neural control.
- Urodynamics are routinely used in some neurosurgical procedures but not widely for spinal cord tumors or tethered cords.
- Combining urodynamics with sphincter electromyography (EMG) can identify specific nerve pathways controlling bladder function.
Purpose of the Study:
- To evaluate the effectiveness of intraoperative urodynamics combined with EMG for monitoring bladder function during spinal cord tumor surgery.
- To assess the feasibility of identifying bladder efferents responsible for detrusor contraction and continence in patients with spinal cord pathologies.
Main Methods:
- Intraoperative urodynamics and sphincter electromyography (EMG) were performed on eight patients undergoing spinal cord tumor surgery.
- Patients included those with ependymoma of the cauda equina, tethered-cord syndrome, and cervical intramedullary tumors.
- Bladder efferents were identified by monitoring detrusor contraction and continence during surgical procedures.
Main Results:
- The combined urodynamics and EMG approach successfully identified bladder efferents responsible for detrusor contraction in patients with cauda equina tumors.
- A strong correlation was observed between preoperative bladder dysfunction, urodynamics, and intraoperative findings (pressure increase, latency).
- The method was not suitable for intramedullary tumors, as no bladder contractions were observed upon spinal cord stimulation.
Conclusions:
- Intraoperative monitoring of urodynamics is an effective tool for identifying bladder efferents in the cauda equina region during surgery.
- This technique allows for real-time assessment of bladder dysfunction based on pressure changes and latency during operations.
- The study highlights the utility of IOM for specific spinal cord pathologies, particularly those involving the cauda equina.