To determine if a pre-operative ketamine infusion would provide a similar decrease in post-operative analgesic and opioid consumption as intra-operative ketamine, but expand the monitoring period through the post-operative phase up to 90 days. Hypothesis is that pre-operative ketamine infusion will lead to a decrease in narcotic consumption from baseline following an elective cervical or lumbar fusion, leading to increased functionality and quality of life for these patients.
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Degree of reduction in opiate consumption following surgery
Timeframe: 12 weeks