One patient with a long history of heavy alcohol use reports hearing hostile voices for several days, while remaining fully oriented, coherent, and able to give an accurate, detailed account of recent events. A second patient, following a severe chest infection, appears muddled, cannot reliably say where he is, occasionally seems to misperceive staff as figures from his past, and drifts in and out of clear awareness of his surroundings. Are both of these best understood as hallucinosis?

No — only the first patient fits. Hallucinosis's own text defines it almost entirely by the clarity of consciousness that surrounds the hallucinations: full clarity of consciousness maintained throughout, with the person alert, oriented, and coherent. The second patient's muddled awareness, disorientation, and drifting level of alertness following an acute physical illness instead describe a disturbance of consciousness, which produces exactly the kind of mismatch between a patient's grasp of their environment and their known baseline that hallucinosis's own text explicitly says it does not have. "Delirium" is the everyday clinical term for this same clouded-consciousness state, and this app's disturbance-of-consciousness entry is the closest existing description of it.