Neuroleptic malignant syndrome: a concealed diagnosis with multitreatment approach

Atypical neuroleptic malignant syndrome in an incarcerated patient: a demographic who may be at increased risk

An incarcerated male patient with a psychiatric history of schizoaffective disorder presented to the emergency department with muscle rigidity and mutism after receiving a 150 mg haloperidol decanoate injection. At the peak of his illness, symptoms included muscular rigidity, mutism, excessive drooling, an altered level of consciousness, tachycardia, diaphoresis and tremors. Atypical neuroleptic malignant syndrome (NMS) was diagnosed after discrediting similar illnesses through clinical reasoning, laboratory and imaging studies. He was successfully treated during a 40-day hospitalisation with lorazepam, amantadine, methocarbamol and supportive care. This case represents an atypical presentation of NMS due to the patient's lack of fever development. Nonetheless, he satisfied many other criteria, most notably rapid symptom onset after receiving a first-generation antipsychotic medication. The case also provides an opportunity to discuss the prevalence of psychiatric illness among the US incarcerated population and incarceration as a risk factor for developing NMS.

Neuroleptic Malignant Syndrome: Early Diagnosis Saves Lives in Low-Resource Settings

Context

Neuroleptic malignant syndrome (NMS) is an uncommon but serious adverse event to antipsychotic medications.

Case Details

A 14-year-old Ugandan lady presented with high grade fevers, multiple convulsions, altered mentation and lead-pipe rigidity following an intramuscular injection of zuclopenthixol acetate (as Clopixol-Acuphase^®). Her labs were significant for elevated aminotransferases and leucocytosis. She had a normal brain CT scan, renal function and cerebrospinal fluid analysis. Discontinuation of Clopixol, administration of bromocriptine 5mg once daily and dantrolene 25mg three times a day and supportive treatment resulted in a complete neurological recovery within 4 weeks of the onset of symptoms.

Discussion

Early diagnosis and prompt supportive therapy are required to reduce mortality and morbidity. Early recognition of symptoms and discontinuation of offending agent by health care providers are needed to have recovery even in settings with limited resources.