内外科护理:心血管与呼吸
方法
- 说出问题所在:泵衰竭、动脉阻塞、节律、血栓、气道狭窄、感染或设备问题。
- 先检查危险征象:低氧、低血压、胸痛、新出现的意识模糊、冰冷无脉搏的肢体。
- 让氧疗与患者相匹配:大多数人为 94–98%,有 CO₂ 潴留风险者为 88–92%。
- 把每种药物与其检测和风险联系起来:华法林与 INR,肝素与 aPTT 和血小板,利尿剂与血钾。
- 选择安全的第一步措施,然后升级处理并重新评估。
公式表、每个专题的关键方法步骤和 16 道练习题,完整解答附在最后。
Why are patients with mitral stenosis at high risk of atrial fibrillation?
A patient with a tracheostomy suddenly becomes distressed, and a suction catheter will not pass down the tube. What should the nurse do first?
哪个格拉斯哥昏迷量表评分通常提示患者可能无法保护自己的气道?
一名服用锂盐的患者多尿、口渴,使用去氨加压素后尿液仍不能浓缩。最可能的原因是什么?
Which statement about fatigue during radiotherapy is correct?
腹部手术后使用硬膜外镇痛的患者血压 82/48 mmHg,脉搏 70 次/分,双足温暖。已排除出血。最可能的原因是什么?
Which advice is important for a patient on long-term oral corticosteroids?
A conscious patient with hypoglycaemia was given fast-acting carbohydrate. On re-check 15 minutes later the blood glucose is 3.6 mmol/L (65 mg/dL). What should the nurse do next?
A patient with recurrent gout starts allopurinol. Which laboratory result shows that the treatment is achieving its goal?
A patient in DKA is receiving IV fluids and insulin. The glucose has fallen to about 220 mg/dL (12.2 mmol/L), but the anion gap is still high. What change would the nurse expect?
练习数值:Na⁺ 146 mmol/L,葡萄糖 12.5 mmol/L,尿素 23.2 mmol/L。计算血清渗透压 Osm = 2·Na⁺ + 葡萄糖 + 尿素,取最接近的整数。
练习数值:Na⁺ 134,Cl⁻ 103,HCO₃⁻ 18 mmol/L,白蛋白 38 g/L。求经白蛋白校正的阴离子间隙 AGc = AG + 0.25·(40 − 白蛋白)。
在这条规则的 II 导联心电图上测量 QT 间期和 R–R 间期,然后用 Bazett 公式 QTc = QT/√RR(均以秒计)计算经心率校正的QTc。答案以秒表示,保留三位小数。
请解读这条 II 导联心电图条带。仅凭这一条心电图条带,你能为哪种解读辩护?点击你的答案。
A swimmer is found unresponsive after diving into shallow water. Which method should the nurse use to open the airway?
四名患者同时到达急诊科。应先看谁?
答案: D · The left atrium enlarges as it pushes blood through the narrow valve
A narrowed mitral valve raises pressure in the left atrium, which dilates. A stretched atrium is prone to atrial fibrillation, and blood stasis there carries a high risk of clots and stroke. Anticoagulation is therefore essential in mitral stenosis with AF.
答案: B · Remove the inner cannula
Tracheostomy emergency guidance is to remove the inner cannula first, because it may be blocked with secretions. If the patient does not improve, the cuff is deflated and the tube may need to be removed. Oxygen is applied to the face and the stoma, and emergency help is called.
答案: D · 8 分或以下
GCS 8 分或以下通常表示昏迷,且患者有无法维持或保护气道的风险,因此需要紧急的高级医师和麻醉科评估。评分范围为 3 到 15 分,应分别报告各项(E、V、M)。
答案: D · 锂引起的肾性尿崩症
锂是肾性尿崩症的常见原因,此时集合管对 ADH 没有反应,因此去氨加压素几乎无效。处理包括由专科复核锂的使用、保证饮水,并监测血钠和锂浓度。
答案: B · It often builds during the course and can last for weeks
Radiotherapy fatigue usually increases as treatment continues and may persist for weeks or months afterwards. Pacing, light exercise and good sleep and nutrition help.
答案: B · 硬膜外引起的交感神经阻滞
硬膜外局部麻醉药可阻断交感神经传出,引起血管扩张和低血压。处理遵循硬膜外方案:评估、让患者平卧、按医嘱给予液体或血管升压药并通知麻醉医生。同时也必须始终考虑出血。
答案: D · Do not stop them suddenly
Long-term steroids suppress the adrenal glands, so stopping suddenly can cause adrenal crisis. Patients should carry a steroid alert card or medical ID and follow sick-day guidance.
答案: C · Give another dose of fast-acting carbohydrate and recheck
If blood glucose remains below the threshold (4 mmol/L in UK guidance, 70 mg/dL in US guidance), the fast-acting treatment is repeated. Once it is above the threshold, a longer-acting carbohydrate such as a sandwich or the next meal helps prevent recurrence.
答案: B · A falling serum uric acid
Allopurinol reduces uric acid production by blocking xanthine oxidase. Over time, a lower serum uric acid reduces gout attacks and dissolves urate crystals. Kidney function is checked, and a rash must be reported because of rare severe skin reactions.
答案: B · Add dextrose to the IV fluids and continue the insulin
The glucose usually falls before the ketoacidosis resolves. Dextrose is added so insulin can continue, clearing ketones without causing hypoglycemia, until the anion gap closes. Stopping insulin too early lets ketoacidosis return.
答案: Osm = 328 mOsm/kg
衍生数值:计算所得的血清渗透压为 2·Na⁺ + 葡萄糖 + 尿素,各值均以 mmol/L 计(葡萄糖和 BUN 以 mg/dL 计时为 2·Na⁺ + 葡萄糖/18 + BUN/2.8);正常约为 275–295 mOsm/kg。P/F 比值是 PaO₂ 除以以小数表示的 FiO₂。海平面的肺泡氧分压为 PAO₂ = FiO₂·(760 − 47) − PaCO₂/0.8 mmHg,A–a 梯度为 PAO₂ − PaO₂。
答案: AGc = 13.5 mmol/L
预期代偿:代谢性酸中毒时,温特公式预测 PaCO₂ = 1.5·HCO₃⁻ + 8 ± 2 mmHg;实测值高于该范围提示合并呼吸性酸中毒,低于该范围提示合并呼吸性碱中毒。阴离子间隙 AG = Na⁺ − (Cl⁻ + HCO₃⁻),正常约为 8–12 mmol/L,用于区分高阴离子间隙与正常阴离子间隙代谢性酸中毒;低白蛋白会掩盖升高的间隙(白蛋白低于 4.0 的部分,每 g/dL 加 2.5)。Δ 比值 (AG − 12)/(24 − HCO₃⁻) 约在 0.8 到 2 之间符合单纯高间隙酸中毒(有些教材用 1 代替 0.8),低于此范围提示合并正常间隙酸中毒,高于 2 提示合并代谢性碱中毒。
校正后高于约 12:阴离子间隙升高。
答案: QTc = 0.51 s
QT 与 QTc:QT 间期从 QRS 波群起点到 T 波终点。它随心率加快而缩短,因此要用以秒为单位的 R–R 间期按心率校正:Bazett QTc = QT/√RR,Fridericia QTc = QT/∛RR。多数教科书使用 Bazett 公式;它在心率快时校正过度,此时宜用 Fridericia。各参考标准的界限不同:QTc 男性高于约 0.45 s、女性高于约 0.46 s 通常称为延长,高于 0.50 s 称为明显延长。
高于 0.50 s:明显延长。(510 ms)
答案: 2:1 房室传导阻滞(类型未定)
2:1 房室传导阻滞:每个 QRS 对应两个 P 波时,没有两个下传的 P 波连续出现,所以无法看出在未下传的 P 波之前,PR 间期是逐渐延长(I 型)还是保持恒定(II 型)。仅凭一条心电图条带,只能称为 2:1 房室传导阻滞;更长的条带或传导比例的改变才能决定类型。QRS 较窄时更可能是 I 型,QRS 增宽时更可能是 II 型,但两者都不能证明。
QRS 较窄时更可能是 I 型,QRS 增宽时更可能是 II 型,但只有更长的条带或传导比例的改变才能决定。
答案: D · Jaw thrust, keeping the head and neck in line
A diving injury may damage the cervical spine. A jaw thrust opens the airway with little neck movement; if it fails, the airway still takes priority.
答案: B · 一名 2 岁的儿童,流口水,身体前倾,有喘鸣
流口水、前倾(三脚架)姿势和喘鸣提示严重的上气道梗阻,如会厌炎,可能迅速变成完全梗阻。应让孩子保持平静,在气道专家到场之前不要检查咽喉。
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