Clozapine-Induced Oculogyric Crises

Characteristics of eye disorders induced by atypical antipsychotics: a real-world study from 2016 to 2022 based on Food and Drug Administration Adverse Event Reporting System

Background

Common atypical antipsychotics include risperidone, paliperidone, olanzapine, lurasidone, quetiapine, clozapine, aripiprazole, ziprasidone, asenapine, brexpiprazole, and cariprazine. Previous studies on ocular adverse reactions of antipsychotics were mainly focused on typical antipsychotics. Systematic research on atypical antipsychotics remains limited.

Objective

This study aimed to evaluate the potential risks of different atypical antipsychotics causing ocular side effects by mining the Food and Drug Administration Adverse Event Reporting System (FAERS) database.

Methods

Extract reports from the FAERS from the first quarter of 2016 to the fourth quarter of 2022 were obtained. Data mining of eye disorders associated with atypical antipsychotics was carried out using The Reporting Odds Ratio (ROR) method and The Medicines and Healthcare Products Regulatory Agency (MHRA) method to determine positive signals.

Results

FAERS reports for 9913783 cases were included in these 28 quarters. 64 defined ocular adverse events were classified into 10 categories according to High-Level Group Terms (HLGT).

Conclusions

There were differences in the types and severity of ocular-related adverse events associated with atypical antipsychotics. Ocular neuromuscular-related adverse events were found among all 11 atypical antipsychotics. Olanzapine had the highest signal intensity in oculogyric crisis. Aripiprazole had the highest signal strength in blepharospasm. Cariprazine was associated with cataract-related ocular adverse reactions. In terms of the types of adverse events, our study found that aripiprazole was associated with 28 types of ocular adverse events, followed by quetiapine. Clozapine was only associated with two types of ocular adverse events.

Oculogyric crises: A review of phenomenology, etiology, pathogenesis, and treatment

Oculogyric crises are a rare movement disorder characterized by paroxysmal, conjugate, tonic, usually upwards, deviation of the eyes. Causes for oculogyric crises are limited and include complications of dopamine-receptor blocking medications and neurometabolic disorders affecting dopamine metabolism, suggesting that an underlying hypodopaminergic state is important to the pathogenesis. Mimickers of oculogyric crises exist, and we propose diagnostic criteria to distinguish true oculogyric crises. Recognition of oculogyric crises is important for the diagnosis and appropriate treatment of rare disorders, and an approach to investigations in oculogyric crises is proposed. © 2017 International Parkinson and Movement Disorder Society.

Incidence of Oculogyric Crisis and Long-Term Outcomes With Second-Generation Antipsychotics in a First-Episode Psychosis Program

Oculogyric crisis (OGC) is an often recurrent dystonic adverse effect of antipsychotic treatment characterized by a sustained fixed upward gaze lasting minutes to hours. The risk of OGC has not been established. We prospectively estimated the incidence rate of OGC in an early intervention service for psychosis and provided details regarding the antipsychotics implicated, clinical presentation, and long-term outcomes of OGC. The Nova Scotia Early Psychosis Program provides comprehensive, team-based care to youth and young adults with schizophrenia spectrum disorder. For 6 years (April 2008 to March 2014), 452 new patients were admitted to the program and participated in an individualized program of care. Eight patients (4 females; mean age, 19.8 years) developed recurrent episodes of OGC after 3 months to 2 years of treatment with 1 or more second-generation antipsychotics, yielding an incidence rate of 1.8% (95% confidence interval, 0.9%-3.4%). Risperidone or olanzapine (alone or in combination with a second antipsychotic) seemed causative in each case. Also implicated in the onset or recurrence of oculogyric episodes were ziprasidone, quetiapine, clozapine, aripiprazole, and the first-generation antipsychotic loxapine. Follow-up ranged between 2 and 7 years. Episodes stopped after switching antipsychotic treatment in 4 cases and after stopping antipsychotic treatment in 2 cases. In the other 2 cases, recurrences were ongoing at last follow-up 2 and 6 years after onset with antipsychotic treatment continuing. We observed a high rate of tardive-onset, recurrent, and potentially chronic ocular dystonias in patients with first-episode psychosis caused by the use of second-generation antipsychotics.

Oculogyric Crisis with Clozapine: A Case Report and Review of Similar Case Reports in the Literature

Oculogyric crisis (OGC) is a dystonic reaction and commonly caused by typical antipsychotics and rarely occurs with clozapine. Here, we are presenting a case of OGC with clozapine therapy and reviewing the similar cases reported in the literature.