護理師為老年病人進行身體評估，下列何者為正常的生理老化變化？

此題探討老年人身體評估中，哪些是正常的生理老化變化。隨著年齡增長，身體各系統會發生結構與功能的改變，這些改變是可預期的，不代表疾病。正確答案（A）描述了唾液分泌減少，這是因為唾液腺功能隨年齡而退化，導致口腔黏膜較乾燥，影響味覺、吞嚥及口腔清潔，增加齲齒和感染風險。這是常見的老化現象。 其他選項均與事實相反。皮膚彈性（B）會隨年齡下降，變得較鬆弛、乾燥，容易產生皺紋。身體對熱的反應（D）會變遲鈍，體溫調節能力下降，老年人更容易因過熱或過冷而出現問題。低光下的視力（C）會減退，因為水晶體可能變得混濁（白內障）或失去彈性，瞳孔對光線的反應也較慢，導致夜間視力及對比敏感度下降。 臨床思路：評估老年病人時，護理師需區分正常老化與病理變化。理解這些生理變化有助於提供適切的照護，例如針對唾液分泌減少，可鼓勵病人少量多次飲水、使用人工唾液或避免刺激性食物。安全方面，反應遲鈍需注意預防燙傷或失溫。

This question addresses which physical assessment findings represent normal age-related changes in older adults. As people age, body systems undergo expected structural and functional changes that are not, in themselves, indicators of disease. The correct answer (A) describes decreased salivary production, which results from age-related decline in salivary gland function and leads to drier oral mucosa, affecting taste, swallowing, and oral hygiene and increasing the risk of dental caries and infection. This is a common change of aging. The other options describe the opposite of reality. Skin elasticity (B) decreases with age, with the skin becoming looser, drier, and more wrinkled. The body's response to heat (D) becomes slower, thermoregulation deteriorates, and older adults are more susceptible to overheating or hypothermia. Night vision (C) declines because the lens may become opaque (cataract) or lose elasticity and the pupillary response to light is slower, resulting in reduced low-light vision and contrast sensitivity. Clinical reasoning: when assessing older clients, the nurse must distinguish normal aging from pathological changes. Understanding these physiological changes supports appropriate care—for example, encouraging frequent small sips of water, using artificial saliva, or avoiding irritating foods for decreased salivation. For decreased thermal sensation, precautions should be taken to prevent burns or hypothermia.