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 is active tuberculosis treated with several drugs for at least six months?
Three hours after femoral cardiac catheterisation, a patient has new lower back and flank pain, a heart rate of 112/min and BP 92/60 mmHg. The groin looks normal. What should the nurse suspect?
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?
A patient with suspected meningitis has a GCS of 9 and pupils that have become unequal. A doctor plans an immediate lumbar puncture. What is the main concern?
Why are carbohydrate drinks often given before surgery in enhanced recovery programmes?
重症急性胰腺炎第 2 天,一名患者呼吸困难,SpO₂ 88%,胸部 X 线显示双肺浸润影。最可能的并发症是什么?
Why is an urgent brain scan needed before thrombolysis for a suspected stroke?
A nurse realises she has given a patient a medicine prescribed for another patient. What should she do first?
A patient starts lisinopril (an ACE inhibitor). Which laboratory values should the nurse expect to be monitored?
Which set of results best shows that diabetic ketoacidosis is resolving?
某练习血气显示代谢性酸中毒,HCO₃⁻ 16 mmol/L。用温特公式求预期PaCO₂(范围的中心),单位 mmHg。
某练习血气显示代谢性碱中毒,HCO₃⁻ 43 mmol/L。用预期 PaCO₂ = 0.7·HCO₃⁻ + 21 求预期PaCO₂。
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。
识别这条 II 导联心电图上的节律。点击你的答案。
A patient on a nasal cannula at 6 L/min still has a low SpO₂. What should the nurse do?
An RN has five patients and a nursing assistant. One patient has just become short of breath. Which task should the RN delegate so that the RN can go to that patient?
答案: D · To kill slow-growing bacteria and prevent drug resistance
Mycobacterium tuberculosis grows slowly and has resistant mutants in any large population. A combination (for example rifampicin, isoniazid, pyrazinamide and ethambutol at first) kills susceptible and resistant bacteria and prevents resistance. Stopping early risks relapse and multidrug-resistant TB.
答案: C · Retroperitoneal bleeding
A high femoral puncture can bleed into the retroperitoneal space without visible groin swelling. Back or flank pain with tachycardia and hypotension is a warning sign. The nurse calls for urgent help, assesses for shock and expects bloods and imaging.
答案: C · 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: A · Raised pressure in the skull, so the procedure could cause herniation
Reduced consciousness and unequal pupils suggest raised ICP. A lumbar puncture in this situation may cause brain herniation, so imaging comes first, and antibiotics are not delayed. The nurse should raise this concern.
答案: A · To reduce insulin resistance and improve recovery
Carbohydrate loading the night before and a few hours before surgery reduces thirst, hunger and postoperative insulin resistance. It is not used in every patient, for example some with diabetes.
答案: C · 急性呼吸窘迫综合征(ARDS)
重症胰腺炎引发全身炎症反应,可导致 ARDS、AKI 和休克。低氧血症伴双肺浸润影是典型表现。需要上报重症监护以获得呼吸支持。
答案: D · To rule out bleeding in the brain
A CT scan distinguishes haemorrhagic from ischaemic stroke. Clot-busting drugs are only given when bleeding has been excluded and other criteria are met.
答案: B · Check the patient's condition and inform the doctor
The first priority is the patient: assess them and inform the prescriber so that any treatment can be given. The error must then be documented, reported and discussed openly with the patient (open disclosure; in the UK, the statutory duty of candour).
答案: C · Potassium and creatinine
ACE inhibitors reduce aldosterone, so potassium can rise, and they lower the filtration pressure in the kidney, so creatinine can rise. Both are checked before and soon after starting or increasing the dose.核对依据: Hyperkalemia · StatPearls (NCBI Bookshelf) (2025)
答案: A · A closing anion gap with a rising bicarbonate and pH
DKA has resolved when the ketoacidosis has cleared: ketones fall, the anion gap normalizes, bicarbonate rises and the pH returns towards normal. Glucose alone is a poor guide, because it falls earlier.
答案: PaCO₂ = 32 mmHg
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。
答案: PaCO₂ = 51.1 mmHg
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。
升高是有限度的:仅靠代偿,PaCO₂ 很少超过约 55 mmHg。
答案: QTc = 0.454 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。
介于男性(约 0.45 s)和女性(约 0.46 s)的通常上限之间:临界,取决于所用的参考标准。(454 ms)
答案: 室性心动过速
室性节律:室性心动过速是连续三个或以上宽大(0.12 s 或以上)的波群,频率超过 100 次/分,通常为 150–250 次/分,节律规则,没有相关的 P 波。心室颤动是紊乱、不规则的波形,无法辨认 P 波、QRS 波群或 T 波,也没有可计数的频率。心脏停搏是几乎平直的线,没有心室活动;平直线一定要通过检查患者、导联和增益并换一个导联来确认。在复苏指南中,室颤和无脉性室速是可电击心律,心脏停搏则不是。
在复苏指南中,室颤和无脉性室速是可电击心律。这里只是识别练习。
答案: D · Report it, because a different oxygen device is likely to be needed
Standard nasal cannulas are usually run at up to about 6 L/min; higher flows dry the nose without much benefit. If the patient still needs more oxygen, the nurse assesses and escalates for a different device.
答案: D · Morning vital signs on the four stable patients
Routine vital signs on stable patients can be delegated, freeing the RN to assess and treat the unstable patient. Assessment, IV medication and explaining a new diagnosis stay with the RN.
ExamProblems · examproblems.com/courses/medical-surgical-nursing