A nurse is assessing a client who has impaired mobility. The nurse should monitor the client for a pressure injury due to which of the following factors?

Choice A reason: Sensory loss increases pressure injury risk by reducing pain perception, preventing repositioning to relieve pressure. However, it is not the primary factor, as poor circulation directly impairs tissue oxygenation and nutrient delivery, making skin more susceptible to breakdown under prolonged pressure in immobile patients. Choice B reason: Poor circulation, often from vascular disease or immobility, reduces blood flow to tissues, limiting oxygen and nutrient delivery. This impairs skin integrity, increasing susceptibility to pressure injuries. Prolonged pressure compresses capillaries, and poor circulation exacerbates ischemia, leading to tissue necrosis, a key factor in pressure ulcer formation. Choice C reason: Muscle weakness contributes to immobility, increasing pressure injury risk by limiting repositioning. However, it is secondary to poor circulation, which directly causes tissue hypoxia and necrosis under pressure. Weak muscles reduce mobility but do not impair perfusion as directly as circulatory deficits do. Choice D reason: Incontinence increases pressure injury risk by causing skin maceration, weakening the epidermal barrier. While significant, it is less critical than poor circulation, which directly reduces tissue oxygenation and healing capacity, making skin more vulnerable to breakdown from pressure in immobile clients.