[Spinal endoscopy in the detection of problems caused by continuous spinal anesthesia]

Area of Science:

• Anesthesiology
• Anatomy

Context:

• Continuous spinal anesthesia (CSA) offers benefits but presents challenges like catheter insertion difficulties, anesthetic distribution issues, and cauda equina syndrome.
• Spinaloscopy provides direct visualization of catheter placement and anesthetic spread within the spinal canal.

Purpose:

• To visualize the behavior of fine-bore catheters and the distribution of local anesthetics during and after insertion using spinaloscopy.
• To identify factors contributing to difficulties in catheter threading and potential causes of nerve trauma during CSA.

Summary:

• Studies in cadavers using spinaloscopy demonstrated that over-insertion of needles leads to catheter malpositioning, preventing entry into the subarachnoid space.
• Local anesthetic distribution differs significantly between epidural needles and fine-bore catheters, with catheters tending to pool anesthetics in dependent areas.
• Catheter manipulation can cause stress on nerve roots, increasing the risk of trauma during insertion or withdrawal.

Impact:

• Findings suggest limiting catheter insertion to 2 cm into the subarachnoid space to reduce malpositioning risks.
• Withdrawing the stylet 2-3 cm after catheter tip entry into the subarachnoid space is recommended to minimize nerve injury and bleeding.
• This research offers crucial insights for improving the safety and efficacy of continuous spinal anesthesia techniques.