病人獲醫囑開立華法林（Warfarin）。護理師應提供下列哪項最重要的飲食指導？
A client is prescribed Warfarin. Which dietary instruction is most important for the nurse to provide?
- AMaintain a consistent daily intake of Vitamin K✓ 正解維持每日維生素K攝取量一致
- BIncrease intake of green leafy vegetables增加綠色葉菜類蔬菜的攝取
- CConsume high amounts of protein攝取大量蛋白質
- DAvoid all citrus fruits避免所有柑橘類水果
Warfarin 是一種維生素 K 拮抗劑，透過抑制肝臟凝血因子合成達到抗凝血效果。維生素 K 是凝血因子的輔因子，飲食中維生素 K 的攝取量會直接影響藥效。護理指導的重點不在於禁止食用綠色蔬菜，而在於維持攝取量的「穩定性」，讓醫師能根據穩定的 INR（國際標準化比值）調整藥物劑量，避免波動導致出血或栓塞。
Warfarin is a vitamin K antagonist that exerts its anticoagulant effect by inhibiting hepatic synthesis of clotting factors. Because vitamin K serves as a cofactor for these clotting factors, dietary vitamin K intake directly influences drug efficacy. The focus of nursing education is not to prohibit green leafy vegetables, but to maintain a consistent intake so that the provider can titrate the dose based on a stable INR (International Normalized Ratio), thereby avoiding fluctuations that could lead to bleeding or thromboembolism.