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。
Which position is usually best for the legs of a patient with chronic venous insufficiency and ankle swelling?
A patient with life-threatening asthma has not responded to repeated nebulised salbutamol (albuterol), ipratropium and steroids. Which drug is commonly given intravenously next?
Which long-term risk should a kidney transplant recipient be taught to reduce with sun protection?
A patient with nephrotic syndrome suddenly has loin pain, blood in the urine and a rise in creatinine. What is a likely cause?
What is achalasia?
A patient taking IV antibiotics has three unexplained loose stools in 24 hours. What should the nurse do first?
During a vesicant chemotherapy infusion, the patient reports burning and swelling at the cannula site. What should the nurse do first?
A few hours after cardiac surgery, a patient has low blood pressure, a raised jugular venous pressure and quiet, muffled heart sounds. What should be suspected?
Which finding during a transfusion suggests transfusion-associated circulatory overload (TACO)?
A patient with long-standing rheumatoid arthritis has a hemoglobin of 10.5 g/dL (105 g/L), a low serum iron, a low total iron-binding capacity (TIBC) and a high-normal ferritin. Which condition fits best?
某练习血气显示 PaCO₂ 29 mmHg (3.9 kPa)。利用规则:在急性呼吸性碱中毒中,PaCO₂ 每比 40 低出 10 mmHg,HCO₃⁻ 下降 2 mmol/L,以HCO₃⁻ 24 mmol/L 为起点,求预期HCO₃⁻。
某练习血气显示代谢性碱中毒,HCO₃⁻ 45 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。
一位处于监护中的患者被发现无反应、呼吸不正常,且摸不到颈动脉搏动。监护仪显示这种有组织的心律。这种情况叫什么?点击你的答案。
一名生命体征正常、病情稳定的成人手上有一处需要缝合的伤口,别无其他问题。哪个 ESI 级别合适?
Before surgery, a nurse is asked to witness a patient’s consent. The patient was given a sedative 30 minutes ago. What should the nurse do?
答案: D · Raised above the level of the heart when resting
Elevating the legs above heart level reduces venous pressure and oedema. Compression therapy, walking and avoiding long periods of standing also help. By contrast, patients with arterial disease often find that lowering the legs eases pain.
答案: D · Magnesium sulfate
A single dose of IV magnesium sulfate is recommended in acute severe or life-threatening asthma that does not respond to initial treatment. Senior and critical care help is called early. Sedatives and beta-blockers are dangerous in acute asthma.
答案: A · Skin cancer
Transplant recipients have a much higher risk of skin cancers, especially squamous cell carcinoma, because of immunosuppression. Sun protection and regular skin checks are important.
答案: C · Renal vein thrombosis
Loss of anticoagulant proteins in nephrotic syndrome raises the risk of thrombosis, including in the renal vein. This can cause loin pain, haematuria and worse kidney function. Imaging and anticoagulation are needed.
答案: C · Failure of the lower oesophageal sphincter to relax on swallowing
In achalasia, peristalsis is lost and the lower oesophageal sphincter does not relax, causing dysphagia to both solids and liquids, regurgitation and weight loss. Treatments include dilatation and surgical myotomy.
答案: B · Isolate the patient and send a stool sample for testing
Unexplained diarrhoea in a patient on antibiotics should be treated as possible C. difficile. The patient is isolated promptly, a stool sample is sent and the antibiotics are reviewed with the medical team.
答案: D · Stop the infusion straight away and follow the extravasation protocol
Suspected extravasation of a vesicant needs the infusion stopped immediately. Local protocols then guide aspiration through the cannula, specific treatments, elevation, documentation and specialist review.
答案: D · Cardiac tamponade
Hypotension, raised JVP and muffled heart sounds (Beck's triad) suggest cardiac tamponade. Blood in the pericardial space compresses the heart and needs urgent drainage.
答案: D · Crackles, hypertension and a raised BNP
TACO is fluid overload, often in older adults or those with heart or kidney disease. It causes dyspnea, crackles, hypertension, distended neck veins and a raised BNP. The transfusion is stopped, the patient is sat up and diuretics may be prescribed.
答案: B · Anemia of chronic disease (inflammation)
In chronic inflammation, iron is trapped in stores, so serum iron is low but ferritin is normal or high and TIBC is low. In iron deficiency, ferritin is low and TIBC is high. Iron supplements help iron deficiency much more than anemia of chronic disease.核对依据: Ferritin Blood Test · MedlinePlus (NIH) (2025); Serum iron test · MedlinePlus (NIH) (2026)
答案: HCO₃⁻ = 21.8 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。
答案: PaCO₂ = 52.5 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 = 0.462 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。
超过男性(约 0.45 s)和女性(约 0.46 s)的通常上限:延长。(462 ms)
答案: 无脉性电活动(PEA)
无脉性电活动(PEA):PEA 无法从心电图条带上看出。监护仪显示有组织的电活动(VF、VT 或心搏停止以外的心律),但患者摸不到脉搏,因此要通过检查患者来识别。在成人复苏指南中,PEA 和心搏停止是不可电击的心脏骤停心律:进行高质量心肺复苏,尽快使用肾上腺素,并寻找可逆原因(5H 和 5T,如低血容量、缺氧、张力性气胸和心脏压塞)。VF 和无脉性 VT 是可电击心律。
PEA 在床旁识别,绝不能仅凭心电图条带。这是考试练习,不是临床指南。
答案: D · 4 级
对稳定的患者,ESI 3 至 5 级取决于预期的资源:两种或更多为 3 级,一种为 4 级,没有为 5 级。简单缝合算一种资源,因此这是 4 级。
答案: A · Not witness the consent and inform the surgeon
Valid consent requires a patient who can understand and decide. After a sedative this may not be possible, so the nurse does not witness it and informs the surgeon, who is responsible for obtaining consent.
ExamProblems · examproblems.com/courses/medical-surgical-nursing