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。
How does digoxin help a patient with atrial fibrillation and heart failure?
A nurse finds a patient collapsed in bed and unresponsive. What should the nurse do first?
What is the dexamethasone suppression test used for?
A nurse teaches a young adult with newly diagnosed epilepsy. Which statement shows a need for further teaching?
Which advice helps a patient with haemorrhoids?
A patient with a sacral pressure ulcer keeps sliding down the bed when the head is raised high. Which advice best reduces shear?
慢性肾病患者的饮食通常需要限制什么?
A patient with known prostate cancer reports new back pain, leg weakness and difficulty passing urine. What should be suspected?
Apart from the lithium level, which tests are monitored regularly in long-term lithium therapy?
一名慢性肾脏病患者磷酸盐为 7.2 mg/dL(2.3 mmol/L)。哪项饮食指导最恰当?
某练习血气显示代谢性酸中毒,HCO₃⁻ 14 mmol/L。用温特公式求预期PaCO₂(范围的中心),单位 mmHg。
练习数值:Na⁺ 140,Cl⁻ 109,HCO₃⁻ 17 mmol/L,白蛋白 25 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。
这条 II 导联心电图显示房室传导阻滞,所以心房和心室以不同的频率搏动。测量 P–P 间期,求出心房率(单位:次/分,1500 法,取整数)。
A patient has a new plaster cast that is still drying. How should the nurse handle it?
哪项委派适合护理助理?
答案: B · It slows AV node conduction and increases contractility
Digoxin inhibits the Na⁺/K⁺-ATPase, raising intracellular calcium and contractility, and increases vagal tone, slowing AV conduction and the ventricular rate. It controls symptoms but does not reduce stroke risk, so anticoagulation is still needed in AF.
答案: C · Shout for help, open the airway and check breathing for up to 10 seconds
In hospital, the nurse shouts for help, opens the airway and looks for normal breathing (and a pulse if trained) for up to 10 seconds. If the patient is not breathing normally, the arrest team is called and CPR started, with a defibrillator brought as soon as possible.
答案: A · To help diagnose Cushing's syndrome
A dose of dexamethasone normally suppresses ACTH and cortisol. In Cushing's syndrome, cortisol stays high. The test is part of the work-up for cortisol excess.
答案: C · "As long as I take my tablets, I can swim alone."
People with epilepsy should never swim alone, even if their seizures are well controlled. Showers are safer than baths. Telling friends about first aid and keeping a seizure diary are good practice.
答案: B · Eat more fibre, drink enough fluid and avoid straining
Soft stools reduce straining and pressure on the anal cushions. Long sitting on the toilet and constipating drugs such as codeine should be avoided.
答案: A · Keep the head of the bed at or below 30° if possible; use slide sheets
A high head position makes patients slide, causing shear on the sacrum. A lower head position when clinically possible, knee break or foot support, and slide sheets for moving reduce shear and friction.
答案: C · 钾和磷
受损的肾脏难以排出钾和磷,因此常需要饮食限制,同时限制盐,有时还要限制液体和蛋白质。
答案: A · Metastatic spinal cord compression
Back pain with neurological symptoms in a patient with cancer suggests metastatic spinal cord compression. It is an oncological emergency needing urgent MRI and treatment to preserve function.
答案: D · Kidney function and thyroid function
Long-term lithium can cause hypothyroidism and impair kidney function, including nephrogenic diabetes insipidus. Creatinine/eGFR and TSH are therefore checked regularly, together with sodium and the lithium level.核对依据: Hypothyroidism · MedlinePlus (NIH) (2024)
答案: C · 限制富含磷酸盐的食物,如加工食品和可乐
CKD 中的高磷通过限制磷摄入、随餐服用结合剂和透析来处理。含有磷酸盐添加剂的加工食品、可乐和大量乳制品是主要来源。核对依据: Phosphorus: Tips for People with Chronic Kidney Disease · Indian Health Service (HHS); Phosphorus and Your Kidneys · National Kidney Foundation (2024); Chronic kidney disease · MedlinePlus (NIH) (2025)
答案: PaCO₂ = 29 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: AGc = 17.75 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 = 0.448 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。
在通常上限之内(男性约 0.45 s,女性约 0.46 s)。(448 ms)
答案: 心房率 = 88 bpm
房室传导阻滞:逐个标出 P 波,检查哪些 P 波后面跟着 QRS。一度:每个 P 波都下传,PR 恒定且大于 0.20 s。二度 I 型(Mobitz I,文氏现象):PR 逐搏延长,直到一个 P 波未下传,然后周期重新开始(成组搏动)。二度 II 型(Mobitz II):下传搏动的 PR 保持恒定,P 波突然不下传;QRS 常增宽。三度(完全性)阻滞:P 波和 QRS 波群各自规则但互相独立,PR 随机变化,心房率快于逸搏率(交界性逸搏 40–60 次/分,QRS 窄;室性逸搏 20–40 次/分,QRS 宽)。2:1 阻滞仅凭一份条带无法判断是 I 型还是 II 型。
三度阻滞,伴窄 QRS 交界性逸搏(通常为 40–60 次/分)。
答案: D · With the palms of the hands, not the fingertips
A wet plaster cast can be dented by fingertips, causing pressure points under the cast. It is handled with the palms, supported on pillows and left uncovered to dry.
答案: A · 为稳定的患者采集常规尿标本
为稳定的患者采集常规尿标本是可预测、可委派的。确认管道位置、吞咽筛查前喂食以及监测输血开始阶段都需要护理评估。
ExamProblems · examproblems.com/courses/medical-surgical-nursing