護理師準備執行無菌傷口換藥。下列哪項行為會破壞無菌區域的無菌狀態？
The nurse is preparing to perform a sterile dressing change. Which action would compromise the sterility of the field?
- AOpening the first flap of the sterile kit away from the body從遠離身體的方向打開無菌包的第一層
- BKeeping the sterile field within the nurse's line of vision使無菌區域保持在護理師的視野範圍內
- CPouring sterile saline into a container without splashing傾倒無菌生理食鹽水時避免噴濺
- DPlacing a sterile gauze pad within the 1-inch (2.5 cm) border of the field✓ 正解將無菌紗布墊放置在無菌區邊緣 1 英吋 (2.5 公分) 範圍內
維持無菌區域（Sterile Field）的完整性是預防手術部位感染的核心。基本原則包括：無菌物品只能接觸無菌物品、視線不可離開無菌區、以及「邊緣污染原則」。無菌布（Sterile drape）的最外圍 1 英吋（2.5 公分）邊界被視為受污染區，因為在打開包裹時手部會接觸到此範圍。因此，所有無菌器材必須放置在中心區域。選項 A 是正確操作，先向遠側打開可避免手臂越過無菌區；選項 B 正確，轉頭或背對無菌區會導致無法監控是否發生污染；選項 C 正確，飛濺的液體會造成濕透現象（Strike-through），使下方不潔面的細菌滲透上來。護理師必須在心中畫出一道防線，嚴格遵守「邊界即污染」的臨床安全共識。
Maintaining the integrity of the sterile field is central to preventing surgical site infection. Key principles include: sterile items contact only sterile items; the sterile field must remain within sight; and the 'edge contamination principle.' The outermost 1-inch (2.5 cm) border of a sterile drape is considered contaminated because hands touch this area when opening the package. Therefore, all sterile equipment must be placed in the central area. Option A is correct: opening the far side first prevents the arm from crossing the sterile field. Option B is correct: turning the head or back to the sterile field prevents monitoring for contamination. Option C is correct: splashed liquid causes strike-through, allowing bacteria from the contaminated surface below to penetrate upward. The nurse must mentally draw a boundary and strictly observe the clinical safety consensus that 'the edge is contaminated.'
美國護理教育對 1-inch border 的定義非常嚴格，考題常以此為陷阱。台灣臨床教學亦然，但在急診或忙碌病房，有時無菌區域的範圍界定較模糊，NCLEX 要求必須嚴格遵守教科書上的物理邊界規定。