Five times as many patients who live in homes are admitted to hospital dehydrated as those who live in their own residences. 12% of those admitted from care homes had high sodium levels - a basic sign of dehydration.
High sodium levels caused and dehydration are particularly dangerous for elderly patients as it puts them at a greater risk of contracting heart attacks and pneumonia.
Dr Anthony Wolff, of the Royal Free Hospital, said that dehydration in care homes was leading to "unnecessary loss of life" raising concerns over the care patients were receiving.
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