Appearance of burning abdominal pain during cesarean section under spinal anesthesia in a patient with complex regional pain syndrome: a case report.

INTRODUCTION

The mechanism of complex regional pain syndrome (CRPS) was reported as being related to both the central and peripheral nervous systems. Recurrence of CRPS was, reportedly, induced by hand surgery in a patient with upper limb CRPS. However, there is no documentation of mechanical allodynia and burning abdominal pain induced by Cesarean section under spinal anesthesia in patients with upper limb CRPS.

CASE: We report the case of a patient who suffered from burning abdominal pain during Cesarean section under spinal anesthesia 13 years after the occurrence of venipuncture-induced CRPS of the upper arm. The patient's pain characteristics were similar to the pain characteristics of her right arm during her previous CRPS episode 13 years earlier. In addition, mechanical allodynia around the incision area was confirmed after surgery. We provided ultrasound-guided rectus sheath block using 20 mL of 0.4% ropivacaine under ultrasound guidance twice, which resulted in the disappearance of the spontaneous pain and allodynia.

DISCUSSION: The pain relief was probably related to blockade of the peripheral input by this block, which in turn would have improved her central sensitization.

CONCLUSION

Our report shows that attention should be paid to the appearance of neuropathic pain of the abdomen during Cesarean section under spinal anesthesia in patients with a history of CRPS.