Abstract
A person with a developmental disability is more likely than the general population to experience mental illness. As many as 60% of persons with developmental disabilities may have symptoms that meet criteria for a diagnosis of a coexisting psychiatric disorder. These persons with dual diagnoses who have both a developmental disability and a psychiatric impairment will seek services in a variety of settings. Approximately 6 million persons in the United States have mental retardation and other developmental disabilities. Psychiatric nurses who understand how developmental disabilities are defined can care with increased competence for a person with developmental disability and psychiatric impairment. Knowledge of behavioral signs and symptoms in a person with developmental disability and psychiatric impairment versus signs and symptoms of the same psychiatric impairment in the general population helps nurses to use a behavioral focus and provide holistic care.
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