Serotonin Syndrome Mimicking Intrathecal Baclofen Withdrawal in a Patient with Hereditary Spastic Paraparesis.

Abstract

ContextSerotonin syndrome is a drug-induced condition related to an increased level of serotonin in the brain, which may induce neuromuscular, autonomic and mental symptoms.Case reportA 40-year-old woman with hereditary spastic paraparesis (Strumpell-Lorrain disease) with an implanted intrathecal baclofen pump for severe spasticity. Two days after starting a medication known to inhibit serotonin re-uptake (paroxetine), she developed a sudden increase in lower limb spasticity with continuous spasms, fever, tachycardia and hypertension. Intrathecal baclofen withdrawal was excluded, confirming serotonin syndrome.ConclusionMedications that inhibit serotonin reuptake may induce serotonin syndrome, resulting in increased spasticity in patients with spinal cord lesions, and should be prescribed with caution.LAY ABSTRACTMedications that inhibit serotonin re-uptake are frequently prescribed for depression. Such drugs increase the level of serotonin in the brain. An excessive level of serotonin may induce serotonin syndrome. We present here the case of a woman with hereditary spastic paraparesis who presented with a sudden increase in spasticity as a consequence of serotonin syndrome. As the patient was implanted with an intrathecal baclofen pump for spasticity management, the serotonin syndrome was mimicking a clinical picture of baclofen withdrawal. Such medications should be prescribed with caution in patients with spasticity.