Successful Use of Electroconvulsive Therapy in Treatment-Resistant Catatonia With Comorbid Parkinson Disease and Neuroborreliosis

Electroconvulsive therapy (ECT) is a highly effective intervention for treatment-resistant catatonia and severe neuropsychiatric disorders. We present the case of a 67-year-old patient with a long-standing diagnosis of schizophrenia who developed catatonic symptoms in the context of Parkinson disease (PD) and neuroborreliosis. After a medication switch from risperidone to quetiapine the patient rapidly deteriorated, displaying psychotic symptoms, disorganized behavior, and aggression. Multiple pharmacological interventions, including clozapine, high-dose risperidone, and benzodiazepines, were ineffective despite therapeutic plasma levels. The patient required seclusion over 50 times due to persistent agitation. Subsequently, he became increasingly withdrawn, refusing food and fluids, and developed pronounced catatonic features (mutism, echopraxia). After 3 months of unsuccessful pharmacotherapy, bilateral ECT was initiated. Within 6 sessions, the patient showed marked clinical improvement. A total of 18 ECT sessions led to full remission of catatonic and psychotic symptoms, with no further need for coercive measures. The patient was discharged home and continues to receive maintenance ECT. This case highlights the efficacy of ECT in managing complex catatonic states in patients with comorbid neuropsychiatric and neuroinflammatory conditions. It also emphasizes the importance of early ECT consideration when pharmacological approaches fail in multifactorial clinical scenarios.