Question: Define schizoaffective disorder and distinguish the major differences and similarities among schizophrenia, schizoaffective, and mood disorders. Discuss the important epidemiologic findings related to schizoaffective disorder. Explain the primary elements involved in assessment, nursing diagnoses, nursing interventions, and evaluation of patients with schizoaffective disorder. Define delusional disorder and name the subtypes of this disorder. Discuss the theories related to the aetiology of delusional disorder. Explain the nursing care of patients with delusional disorder. Identify the essential features of schizophreniform disorder, brief psychotic disorder, substance-/medication-induced psychotic disorder, and psychotic disorder due to another medical condition.