Catatonia in Adolescence: First Onset Psychosis or Anti-NMDAr Encephalitis?

Adolescents and Young Adults With Anti-N-methyl-D-aspartate Receptor Encephalitis With Excited Catatonia: Literature Review and 2 Illustrative Cases

BACKGROUND

Catatonia is a complex neuropsychiatric syndrome that can be associated with several underlying etiologies including primary psychiatric and autoimmune disorders. Anti-N-methyl-D-aspartate receptor encephalitis is an autoimmune disorder typically characterized by seizures, movement abnormalities, and behavioral changes. Anti-N-methyl-D-aspartate can present with complex neuropsychiatric symptoms including catatonia which can be challenging for clinicians to identify as excited catatonia can mimic delirium and psychiatric disorders such as psychosis and mania.

OBJECTIVES

To identify and present cases of anti-N-methyl-D-aspartate receptor encephalitis where excited catatonia is the presenting symptom.

METHODS

We present 2 case studies of agitation and disinhibition in an adolescent and young adult that were ultimately found to be secondary to autoimmune receptor encephalitis, in both cases, confirmed by cerebrospinal fluid analysis to be due to anti-N-methyl-D-aspartate receptor antibodies.

RESULTS

Excited catatonia was suspected and initially treated with immunological therapy and high doses of lorazepam. As the severity of catatonia progressed with limited improvement with lorazepam, both cases were ultimately effectively treated with electroconvulsive therapy.

CONCLUSIONS

Excited catatonia should be considered with presentations of bizarre behavior, agitation, disinhibition, and other psychotic symptoms in patients with no prior psychiatric history. Although the primary treatment for catatonia associated with anti-N-methyl-D-aspartate receptor encephalitis is immunomodulatory therapy paired with benzodiazepines, electroconvulsive therapy has been shown to be an effective and safe adjuvant treatment that is especially useful for management of excited catatonia.

Diagnosis of pediatric anti-NMDAR encephalitis at the onset: A clinical challenge

BACKGROUNDS

To investigate the clinical and instrumental features at the onset addressing to the diagnosis of anti-NMDAR encephalitis.

METHODS

Twenty children (age: 15 months-17 years; 7 males, 13 females) with initial suspected diagnosis of autoimmune encephalitis, observed between January 2008 and March 2018, were included. The final diagnosis was anti-NMDAR encephalitis in 7 children, other/probable autoimmune encephalitis in 7 children, and primary psychosis in the remaining 6 children.

RESULTS

At the clinical onset, anxiety disorder was the main symptom that helped in distinguishing the group of psychotic children from children with non-infectious encephalitis (P = 0.05 OR = 0.001), while epileptic seizures strongly predicted anti-NMDAR encephalitis (P = 0.04 OR = 28.6). At the onset, anti-NMDAR encephalitis could be distinguished from other/probable autoimmune encephalitis for the presence of sleep/wake rhythm alteration (P = 0.05 OR = 15). Among the symptoms occurring during the hospitalization, movement disorders (P = 0.031 OR = 12) were predictive of non-infectious encephalitis rather than primary psychosis. More specifically, the occurrence of language impairment (P = 0.03 OR = 33), epileptic seizures (P = 0.04 OR = 28.6) and catatonia (P = 0.03, OR = 33), were predictive of anti-NMDAR encephalitis. Also at this stage, anxiety disorder (P = 0.03 OR = 0.033) was predictive of primary psychosis.

CONCLUSION

Our findings suggest that at the clinical onset epileptic seizures and sleep/wake rhythm alteration represent the main features addressing to the diagnosis of anti-NMDAR encephalitis rather than primary psychosis and other/probable autoimmune encephalitis, while anxiety disorder could be a solid predictor of primary psychosis.