Our expert says:
Especially babies and old people are at risk of stroke when dehydrated severely. It is difficult for me to guess why he deteriorated, he may have had mini strokes, or suffered renal damage causing abnormal electrolytes in the blood that can cause disorientation ( presenting as dementia or delirium). This can also be caused by medications as side effects.
Is it possible to speak to the doctor that treats him at the moment?
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