# 護理師照護一名重症個案，已以機械通氣給予100% FiO2達30小時。哪一項評估發現最需要通知醫師？

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=391786&lang=zh-tw  
> language: zh-TW  
> subject: Medical Emergencies  
> category: PA

## 題目

護理師照護一名重症個案，已以機械通氣給予100% FiO2達30小時。哪一項評估發現最需要通知醫師？

## 選項

1. 核心體溫37.4°C
2. 新出現胸骨後不適、乾咳與肺順應性下降，提示氧氣毒性 **✔ 正確答案**
3. 血清葡萄糖130 mg/dL
4. 尿量60 mL/小時

**正確答案: 2**

## 解析

正確 (2)：長時間暴露於高FiO2（>50%）超過24-48小時會造成肺部氧氣毒性：胸骨下疼痛、乾咳、呼吸困難，以及因肺不張和肺泡損傷造成的順應性下降；可進展為類似ARDS的傷害。安全時盡快將FiO2降至

## 深入解析

記憶提示 氧氣毒性 =「超過50，接近50小時」。FiO2 >50%持續越久越危險。臨床指引 以PEEP與俯臥位協助氧合並降低FiO2，而不是長時間依賴高FiO2。

## 臨床情境

情境 48歲男性，ARDS使用機械通氣，FiO2 100%已30小時。新出現胸骨後不適、乾咳，且呼吸器設定下肺順應性下降。

## 重要概念

- **肺部氧氣毒性** — 長時間高FiO2造成自由基傷害；表現為胸痛、乾咳、順應性下降。
- **呼氣末正壓（PEEP）** — 用於ARDS中招募肺泡並降低FiO2需求的呼氣末正壓。
- **FiO2撤降** — 在可耐受時盡快將吸入氧濃度降至

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