Epiduroscopic changes in patients undergoing single and repeated epidural injections

Area of Science:

• Anesthesiology
• Medical Imaging
• Anatomy

Background:

• Epidural anesthesia (EA) is commonly used for pain management.
• The long-term effects of repeated EA on the epidural space are not fully understood.
• Previous studies have not adequately visualized the epidural space after repeated catheter use.

Purpose of the Study:

• To investigate the effects of repeated epidural anesthesia on the epidural space using a superfine fiberscope.
• To assess the incidence of adverse reactions and tissue changes in patients receiving repeated EA.
• To evaluate the utility of superfine fiberscope technology in diagnosing local epidural complications.

Main Methods:

• A superfine fiberscope (0.75 mm outer diameter) was used to examine the epidural space in 18 patients.
• Patients were divided into a control group (no prior EA) and an EA group (repeated EA with bupivacaine).
• Fiberscope examination was performed through a 17-gauge Tuohy needle after repeated epidural catheterization (2-3 times/day for 7-14 days).

Main Results:

• The epidural space was observed to contain significant fat masses, blood vessels, and connective tissue.
• Four patients in the EA group exhibited adverse reactions, including hemorrhage and congestion.
• Five patients in the EA group reported pain during fiberscope insertion, suggesting local irritation or inflammation.

Conclusions:

• Continuous or repeated epidural anesthesia may lead to a high incidence of nonspecific epidural changes.
• Superfine fiberscope examination is a potentially valuable tool for detecting and diagnosing local epidural reactions.
• Further research is warranted to understand the clinical significance of these observed epidural changes.