Propriospinal myoclonus following spinal anesthesia for knee arthroscopy

Spinal myoclonus (SM) after neuraxial anesthesia is a rare but distressing complication for anesthesiologist.Propriospinal myoclonus, a variant of spinal myoclonus, is even rarer and is a disorder characterized by sudden, shock-like, involuntary jerks originating from axial muscles.We present a case of a patient who developed propriospinal myoclonus 135 minutes after spinal anesthesia.Arthroscopy under spinal anaesthesia was planned for a patient with meniscopathy.Spinal anaesthesia was performed with 10 mg hyperbaric bupivacaine and 100 mcg morphine.Myoclonic movements in the upper extremities and trunk of the patient started 135 minutes after spinal anaesthesia.Diazepam 10 mg slow bolus followed by 10 mg/30 min infusion was administered and the frequency of myoclonic movements decreased but did not completely disappear.Diazepam infusion was repeated and myoclonic movements disappeared approximately 6 hours after spinal anaesthesia.In conclusion, anesthesiologists should be aware that this rare condition is a temporary complication with no sequelae.