Brachial Plexus Injury Clinical Trial
Official title:
Ketamine Infusion for Treatment of Chronic Neuropathic Pain in Traumatic Brachial Plexus Injuries, a Prospective Randomized Control Study
The purpose of this study is to assess pre- and postoperative neuropathic pain in patients with traumatic brachial plexus injuries to determine if intraoperative ketamine infusion affect neuropathic pain associated with avulsion injuries of the brachial plexus.
Neuropathic pain following traumatic brachial plexus injuries is a common and debilitating problem that has been reported in up to 64-75% of patients. Neuropathic pain is difficult to treat, particularly when secondary to avulsion injuries of the brachial plexus. Current treatment options include neuromodulating pharmacologic agents including gabapentin, pregabalin, tricyclic antidepressants, and duloxetine among others. Other analgesic modalities include TENS unit application, massage, acupuncture, and topical medications. Despite these treatment options, patients frequently continue to experience significant, debilitating neuropathic pain. The use of ketamine has recently been studied in complex regional pain syndrome (CRPS), spinal cord injuries, and chronic neuropathic pain with encouraging results. Ketamine is thought to exert its analgesic properties via noncompetitive central nervous system N-methyl-D-aspartate (NMDA) antagonism among other primarily central mechanisms including sodium channel blockade, activation of D2 dopamine receptors and facilitation of γ-aminobutyric acid A (GABA-A) signaling. It is utilized clinically in acute and chronic pain management primarily in hospitalized settings to treat a variety of pain states as well as medically refractory depression and headache disorders. The dosing and administration of ketamine infusion varies widely across studies and includes oral ketamine, low dose infusions, and infusions producing an anesthetic effect. To our knowledge, ketamine's use in subanesthetic doses has not been adequately evaluated in patients with neuropathic pain following traumatic brachial plexus injuries. Our study aims to determine how intraoperative ketamine infusion alters neuropathic pain severity associated with brachial plexus avulsion injury in the post-operative period. In addition, we hypothesize that patients receiving intraoperative ketamine infusion will require less narcotic pain medication through the follow-up period of 6 months following surgery. Patients who are undergoing planned surgery for brachial plexus reconstruction at Mayo Clinic will be enrolled into this study to be randomized into getting ketamine infusions or a placebo medication during surgery and in the 24 hour postoperative period after surgery. Pain will be measured before surgery and at various time points to up to 6 months after surgery through online pain measurement scores. ;
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