Objective. To examine the phenomenological characteristics of delirium based on the Memorial Delirium Assessment Scale (MDAS) in order to explore the presence, severity of, and relationship between symptoms. Methods. An analysis of 100 cases of delirium recruited at Memorial Sloan Kettering Cancer Center (MSKCC) was performed. Sociodemographic and medical variables, the Memorial Delirium Assessment Scale (MDAS) subitems, and Karnofsky Performance Status scale (KPS) were analyzed of respect of the phenomenological characteristics and their interrelationship. Results. The most severe and frequent symptoms were recorded in the cognitive domain, psychomotor behavior, sleep-wake cycle, and disturbance of consciousness. Within the cognitive domain, concentration was the most severely affected task. The severity of impairment in most domains increased with delirium severity, whereas perceptual disturbances and delusions were independent of delirium severity. Advanced age and the prevalence of dementia increased with delirium severity in contrast to the functional status which declined. The presence of perceptual disturbances and delusions was independent of cognitive impairment and psychomotor abnormality, however, associated with the disturbances of consciousness and attention. Conclusion. Cognition, in particular concentration, was the most severely affected domain. Advanced age and the prevalence of dementia contributed to more severe delirium. Perceptual disturbances and delusions were independent of delirium severity; however, they were associated with disturbances of consciousness and attention. 1. Introduction Delirium is a neuropsychiatric disorder which is characterized by disturbances of consciousness, attention, cognition, and perception with an abrupt onset and fluctuating course and an underlying physiological etiology [1]. Further frequent symptoms of delirium include various mood changes, sleep-wake cycle disturbances, and psychomotor as well as language abnormalities [2]. The phenomenology of delirium has been examined in a number of studies. In a review [3], impairments in arousal have been recorded in 75% (48–82%), orientation in 76% (62–100%), attention in 65% (17–100%), memory in 84% (64–100%), thought process in 48% (2–68%), perception in 33% (20–78%), delusions in 27% (19–68%), psychomotor retardation in 59% (53–60%), psychomotor agitation in 44% (28–90%), and sleep-wake cycle in 53% (18–98%). The prevalence of perceptual disturbances and delusions was evaluated in further studies. Two studies revealed an approximately equal prevalence of
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