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。
COPD 患者通常推荐接种哪些疫苗?
A patient with a confirmed type A aortic dissection is hypertensive and tachycardic while awaiting surgery. Which drug class is usually given first to lower the heart rate and blood pressure?
A nurse is teaching a patient going home after a mild concussion. Which statement shows a need for further teaching?
After a stroke, a patient suddenly cries or laughs at odd moments. They say they do not feel sad. Which response is most appropriate?
After laparoscopic cholecystectomy, a patient has pain in the right shoulder. What is the most likely cause?
A bag of parenteral nutrition runs out and the next one will not arrive for several hours. Which risk should the nurse anticipate?
A patient who injects drugs has a fever, a new heart murmur and small dark lines under the nails. What is the likely diagnosis?
A patient has a high fever with rigors, jaundice and right upper quadrant pain. Which condition is most likely?
Which technique is recommended for a capillary blood glucose test on an adult's finger?
A patient with a round face, central weight gain and purple stretch marks has a glucose of 210 mg/dL (11.7 mmol/L) and a potassium of 3.1 mEq/L. Which condition fits best?
某练习动脉血气显示 pH 7.27,PaCO₂ 54 mmHg (7.2 kPa),HCO₃⁻ 24 mmol/L。原发性紊乱是呼吸性酸中毒。代偿到什么程度?点选你的答案。
某练习血气显示代谢性酸中毒:pH 7.28,PaCO₂ 24 mmHg (3.2 kPa),HCO₃⁻ 11 mmol/L。把实测的PaCO₂与温特公式比较。点选你的解读。
解读这条 II 导联心律条带。这是什么节律?点击你的答案。
依次按五个步骤解读这条 II 导联心电图:心率、节律、P 波、PR 间期、QRS 时限。你在哪一步发现第一个异常?点击它。
一名护士要求护理助理使用机械升降机。助理说他们从未接受过使用它的培训。如果护士坚持,将违反委派的哪项正确原则?
护士应首先处理护理助理的哪项报告?
答案: A · 每年接种流感疫苗和肺炎球菌疫苗
接种流感疫苗、肺炎球菌疫苗以及国家免疫规划推荐的其他呼吸道感染疫苗(如新冠疫苗,以及老年人的 RSV 疫苗),可减少 COPD 患者的感染和急性加重。
答案: D · An intravenous beta-blocker
In acute dissection, IV beta-blockers are usually given first to reduce heart rate and the rate of rise of pressure, limiting extension of the tear. Vasodilators may follow once the heart rate is controlled. Antiplatelets, anticoagulants and thrombolytics are avoided. Type A dissection needs urgent surgery.
答案: C · "A few drinks tonight will help me relax and sleep."
After a head injury, alcohol and sedatives should be avoided because they can mask drowsiness and confusion. A responsible adult should stay with the patient, and worsening headache, repeated vomiting, confusion or drowsiness mean they must return.
答案: A · Explain that this is emotional lability after stroke and help the family understand
Emotional lability (pseudobulbar affect) is common after stroke: crying or laughter does not match the person's mood. Explaining it, staying calm and gently distracting the patient helps. True depression is also common and should be screened for separately.
答案: A · Gas used during surgery irritating the diaphragm
Carbon dioxide used to inflate the abdomen irritates the diaphragm, causing referred shoulder-tip pain. It usually settles within a few days; walking and simple analgesia help.
答案: B · Rebound hypoglycaemia
Stopping PN suddenly can cause hypoglycaemia because insulin levels stay high for a while. Glucose is monitored, and a glucose infusion may be given according to local policy.
答案: C · Infective endocarditis
Infective endocarditis causes fever and a new or changing murmur, sometimes with splinter haemorrhages. Several sets of blood cultures are taken before long-course IV antibiotics.
答案: B · Ascending cholangitis
Fever, jaundice and right upper quadrant pain (Charcot's triad) suggest infection of an obstructed bile duct. It can rapidly cause sepsis and needs antibiotics and biliary drainage.
答案: C · Prick the side of the fingertip
The sides of the fingertips are less sensitive than the pads, so they are used for capillary sampling. Rotating sites reduces soreness, and hard squeezing can add tissue fluid that gives inaccurate results.
答案: B · Cushing syndrome
Excess cortisol raises glucose, causes central obesity, a round face and purple striae, and has some mineralocorticoid effect that lowers potassium. Adrenal insufficiency causes low glucose and high potassium.核对依据: Hypercortisolism (Cushing Syndrome) · StatPearls (NCBI Bookshelf) (2025); Hypokalemia · StatPearls (NCBI Bookshelf) (2025)
答案: 未代偿
解读血气(ROME):先看 pH:低于 7.35 为酸血症,高于 7.45 为碱血症。然后找出能解释它的指标。PaCO₂(正常 35–45 mmHg,4.7–6.0 kPa)是呼吸方面的指标,在呼吸性紊乱中与 pH 反向(Opposite)变化;HCO₃⁻(正常 22–26 mmol/L)是代谢方面的指标,与 pH 同向变化(Respiratory Opposite, Metabolic Equal,即呼吸性相反,代谢性相同)。另一个指标显示代偿情况:正常表示未代偿;沿着使 pH 回升的方向异常、而 pH 仍然异常,表示部分代偿;pH 正常而两个指标都异常,表示完全代偿。各实验室的范围略有差异;这些是练习用数值。
答案: 适当的代偿
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: 窦性心动过速
节律标准(II 导联):窦性心律每个 QRS 之前都有直立的 P 波,PR 恒定为 0.12–0.20 s,QRS 狭窄:60–100 次/分为正常窦性心律,低于 60 为窦性心动过缓,高于 100 为窦性心动过速。心房颤动:无 P 波,基线呈颤动,R–R 绝对不规则。心房扑动:约 250–350 次/分的锯齿状扑动波,伴固定的传导比例,如 2:1 或 4:1。一度房室传导阻滞:窦性心律,PR 恒定且大于 0.20 s。交界性心律:窄 QRS,40–60 次/分,P 波缺失或倒置(PR 低于 0.12 s,或 P 波在 QRS 之后)。室性早搏(PVC)是提前出现的宽大(0.12 s 或以上)、形态怪异的 QRS,没有 P 波,T 波方向相反,通常有完全性代偿间歇;二联律是指每隔一个搏动就有一个室性早搏。
答案: 节律
每条心电图的五个步骤:1. 心率(300 法或 1500 法;若不规则则用 6 秒法);2. 节律:R–R 间期是否相等;3. P 波:是否存在、在 II 导联直立、每个 QRS 之前各有一个且形态一致;4. PR 间期:0.12–0.20 s 且恒定;5. QRS 时限:低于 0.12 s。五个步骤做完之后才命名节律。正常窦性心律五项全部符合:60–100 次/分,规则,每个 QRS 之前有直立 P 波,PR 0.12–0.20 s,QRS 低于 0.12 s。
答案: D · 正确的人员
正确的人员是指被委派者接受过该任务的培训并有能力完成。使用升降机通常是可委派的任务,但不能委派给没有接受过培训的人。护士应安排培训或在协助下自己完成任务。
答案: B · 今天上午腰椎融合术后,双腿没有感觉也不能活动
脊柱手术后双腿新出现无感觉和不能活动,可能意味着血肿压迫脊髓或神经,需要立即评估和上报。肺炎的黄色痰和长期的神经病变是预期的。
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