Recurrent postoperative CRPS I in patients with abnormal preoperative sympathetic function

Area of Science:

• Neurology
• Pain Management
• Autonomic Nervous System Disorders

Background:

• Complex regional pain syndrome type I (CRPS I) is a debilitating condition affecting the autonomic nervous system.
• Recurrence of CRPS I after repeat surgery at the same site is a clinical challenge.
• Understanding sympathetic nervous system function is crucial for managing CRPS I.

Purpose of the Study:

• To evaluate preoperative and postoperative sympathetic function in patients undergoing repeat carpal tunnel surgery.
• To assess the recurrence rate of CRPS I after repeat carpal tunnel surgery.
• To identify potential predictors of CRPS I recurrence.

Main Methods:

• Thirty-four patients with prior CRPS I after carpal tunnel release underwent repeat open surgery.
• Laser Doppler imaging (LDI) assessed sympathetic function preoperatively and postoperatively.
• Patients were grouped based on preoperative LDI findings (abnormal vs. normal sympathetic function).

Main Results:

• Recurrence of CRPS I was higher in patients with abnormal preoperative LDI (8/11) compared to those with normal LDI (3/23).
• All recurrent CRPS I cases were successfully treated with multimodal therapy.
• Post-treatment LDI remained abnormal in most patients with resolved CRPS I from the abnormal preoperative group.

Conclusions:

• CRPS I can recur following repeat carpal tunnel surgery.
• Preoperative sympathetic dysfunction, as indicated by LDI, may identify patients at higher risk for CRPS I recurrence.
• Perioperative therapies may benefit individuals identified with preoperative sympathetic dysfunction.