Since Christmas, we have had the opportunity to observe a series of cases at the psychiatric clinic that do not fit any of our usual diagnoses. Nevertheless, they show a similarity in type of onset and symptomatology that forces one to group them into one clinical picture. We are dealing with a kind of sleeping sickness, so to speak, having an unusually prolonged course. The first symptoms are usually acture, with headaches and malaise. Then a state of somnolence appears, often associated with active delirium, from which the patient can be awakened easily. He is able to give appropriate answers and to comprehend the situation. He can follow commands correctly and is able to walk and stand, but if left by himself, he falls back into his somnolent state. this deliriuos
Economo P. Encephalitis Lethargica. Arch Neurol. 1968;18(3):325–328. doi:10.1001/archneur.1968.00470330115014
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