Voltage-gated potassium channel limbic encephalitis presenting as functional cognitive impairment.

Limbic encephalitis is often reported to present as seizures and impaired cognition with little focus on psychiatric presentations. In this case report, we present a 49-year-old man who initially presented to the Psychiatric Liaison Service with a several month history of confusion with the additional emergence of visual hallucinations and delusions. Due to the inconsistent nature of the symptoms in the context of a major financial stressor, a provisional functional cognitive impairment diagnosis was made. Investigations later revealed a positive titre of voltage-gated potassium channel (VGKC) antibodies, subtype leucine-rich glioma inactivated 1 accounting for his symptoms which dramatically resolved with steroids and immunoglobulins. This case highlighted the need for maintaining broad differential diagnoses in a patient presenting with unusual psychiatric symptoms.

Clozapine-resistant psychosis, smoking, and caffeine: managing the neglected effects of substances that our patients consume every day.

More than 30% of patients with psychotic disorders who are refractory to antipsychotic treatment also fail to respond to clozapine. Despite the high prevalence of smoking and caffeine use in the psychiatric population, these habits are usually overlooked as factors contributing to antipsychotic treatment failure. We describe 2 male patients with severe treatment-resistant psychosis, one with schizophrenia and the other with bipolar affective disorder-both of whom smoked heavily, and the latter also consumed enormous amounts of caffeine-whose symptoms were refractory to clozapine. Both patients experienced a major, sustained amelioration of their psychotic symptoms when clozapine treatment was recommenced under supervision in the inpatient setting and the pharmacological interactions between clozapine, smoking, and caffeine were considered. Therapeutic strategies included gradual increases in daily doses of clozapine, monitoring clozapine plasma levels, using single daily doses of clozapine at night, and augmenting clozapine treatment with low doses of amisulpride, a selective antagonist at the dopamine D2 and D3 receptors. Smoking and excessive caffeine use are associated with poor therapeutic responses to clozapine and should be considered in the pharmacological management of treatment-refractory psychosis, regardless of the primary diagnosis.

Aripiprazole treatment of Asperger's syndrome in the acute psychiatric setting: case report.

Asperger's syndrome (AS) is under-recognized and may be misdiagnosed as schizophrenia in adults because of symptom overlap. Pharmacological treatment usually targets associated behavioral and mental symptoms rather than the actual core features of AS. We report a middle-aged male patient who, after many years of previous contact with mental health services, and on account of his psychotic symptoms and diagnosis of schizophrenia, was admitted to an inner-city acute psychiatric unit, where a primary diagnosis of AS was established for the first time in his life. His impairing clinical features of AS improved markedly following treatment using aripiprazole, a novel atypical antipsychotic that acts as a partial agonist at dopamine D(2) receptors. As well as sharing clinical features, there is an overlap in underlying neurobiology of AS and schizophrenia, including dopamine dysfunction, that provides a rationale for using antipsychotics of this class in the clinical management not only of associated psychotic symptoms but also of the core features of AS itself.