International psychogeriatrics
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Over the past several decades, numerous investigators have studied the syndrome of delirium. Researchers have relied on a number of different case finding methods to detect the syndrome. ⋯ We assess the validity and reliability of these instruments and compare the advantages and disadvantages of the different methods. We then present the rationale for the development of the Delirium Symptom Interview, an instrument constructed for use in the Commonwealth-Harvard Study of delirium in elderly hospitalized patients.
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While all delirious patients have clouding of consciousness (alteration of attention) and cognitive dysfunction, the level of alertness of different patients may range from stuporous to hyperalert. We, therefore, developed an analog scale to rate the alertness of delirious patients, and a separate scale to rate the severity of their clouding of consciousness. Based on these scales, patients were categorized overall as relatively "activated" (relatively alert despite clouding of consciousness), or "somnolent" (relatively stuporous along with clouding of consciousness). ⋯ These data indicate that phenomenologic subtypes of delirium can be defined on the basis of level of alertness. These subtypes are validated in part by their differing associations with symptoms unrelated to alertness. These subtypes may have different pathophysiology, and thus, potentially different treatments.
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This paper reviews the historical development of the American Psychiatric Association's Diagnostic and Statistical Manual. It presents some of the issues that the clinician has found difficult in applying DSM-III and DSM-III-R criteria for delirium. In addition it introduces some options for DSM-IV criteria for delirium based on several empirical studies. These options should be studied and debated carefully over the next year because in part, they represent radical departures from existing diagnostic criteria for delirium.