Final answer:
A pressure ulcer, abbreviated as PU or known as a decubitus ulcer, is caused by prolonged pressure on body parts, leading to tissue damage and necrosis.
Explanation:
A pressure ulcer is abbreviated as PU and is also known as decubitus ulcer. These ulcers are caused by prolonged pressure on certain body parts, which can lead to tissue damage and necrosis. They are common in immobile patients, especially the elderly.
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