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。
A peripheral cannula site is red, warm, tender and swollen along the vein. What should the nurse do?
On the first day after abdominal surgery, a patient has a temperature of 37.8 °C, SpO₂ 93% on air and reduced breath sounds at both bases. They have stayed in bed because of pain. What is the most likely cause and response?
一名高血压难以控制、血钾持续偏低的患者,未使用利尿剂。应考虑哪种疾病?
A patient who had pituitary surgery has fatigue and feels cold. TSH is low, and free T4 is low. What is the most likely cause?
哪些体征提示严重急性胰腺炎伴组织内出血?
A worker has a hydrofluoric acid burn on the hand and severe pain. After irrigation with water, which specific treatment is commonly applied?
Which is a first-line nursing measure to help prevent constipation in hospital?
A patient with type 1 diabetes is nil by mouth before surgery. Why must their insulin not simply be stopped?
一名服用地高辛的患者血药水平为 2.8 ng/mL,心率 52 次/分。护士最好的措施是什么?
A patient has marked generalized edema. Results show heavy proteinuria, serum albumin 1.8 g/dL (18 g/L) and total cholesterol 340 mg/dL (8.8 mmol/L). Which condition fits best?
某练习血气显示 PaCO₂ 78 mmHg (10.4 kPa)。利用规则:在慢性呼吸性酸中毒中,PaCO₂ 每比 40 高出 10 mmHg,HCO₃⁻ 升高 3.5 mmol/L,以HCO₃⁻ 24 mmol/L 为起点,求预期HCO₃⁻。
某练习血气显示呼吸性酸中毒:pH 7.30,PaCO₂ 82 mmHg (10.9 kPa),HCO₃⁻ 39 mmol/L。利用规则“HCO₃⁻ 每 10 mmHg 升高 1 mmol/L(急性)或 3.5 mmol/L(慢性)”进行分类。点选你的答案。
解读这条 II 导联心律条带。这是什么节律?点击你的答案。
识别这条 II 导联心电图上的节律。点击你的答案。
A drowsy patient has an arterial blood gas with pH 7.30, PaCO₂ 58 mmHg (7.7 kPa) and HCO₃⁻ 25 mEq/L (mmol/L). Which problem is the priority?
During JumpSTART triage, a child who cannot walk is breathing 50 times a minute. Which category is the child given?
答案: D · Remove the cannula, document and monitor the site
Redness, pain, warmth and swelling along the vein indicate phlebitis. The cannula is removed, the site is observed for infection and the event is documented. Regular visual phlebitis scoring and removing cannulas that are no longer needed reduce the risk.
答案: A · Atelectasis: give analgesia, deep breathing and mobilisation
Atelectasis is common in the first days after surgery, especially upper abdominal surgery, due to pain, shallow breathing and immobility. It can cause a low-grade fever and reduced basal breath sounds. Good analgesia, deep breathing exercises, coughing with wound support and early mobilisation reverse it and prevent pneumonia.
答案: B · 原发性醛固酮增多症(Conn 综合征)
醛固酮过多导致钠水潴留(高血压)和钾丢失(低钾血症)。原发性醛固酮增多症是高血压常见的继发原因,通过醛固酮/肾素比值筛查。Addison 病的表现则相反。
答案: D · Secondary hypothyroidism
When the pituitary cannot make enough TSH, the thyroid is not stimulated, so both TSH and free T4 are low. In primary thyroid failure, TSH is high. In secondary hypothyroidism, free T4, not TSH, is used to guide the dose.
答案: D · 脐周或腰部瘀斑
Cullen 征(脐周瘀斑)和 Grey Turner 征(腰部瘀斑)是重症胰腺炎中腹膜后出血少见的晚期体征,提示预后不良。
答案: D · Calcium gluconate gel
Hydrofluoric acid penetrates deeply and binds calcium and magnesium, causing severe pain and possible life-threatening hypocalcaemia. Calcium gluconate gel binds fluoride; serum calcium and heart rhythm are monitored in larger exposures.
答案: D · Encouraging fluids, fibre and mobility
Adequate fluids, a fibre-rich diet, mobility and privacy for toileting help prevent constipation. Laxatives are added if needed, especially with opioids.
答案: C · Without any insulin they can develop diabetic ketoacidosis
People with type 1 diabetes make no insulin, so stopping it causes ketosis and DKA. Basal insulin is usually continued, often with a variable-rate insulin infusion and glucose monitoring.
答案: B · 暂停该剂量并通知开医嘱者
2.8 ng/mL 的水平高于通常范围,心率慢也符合中毒。护士应暂停该剂量,检查钾和心电图并通知开医嘱者。
答案: D · Nephrotic syndrome
Nephrotic syndrome is heavy proteinuria with low albumin, edema and high lipids. Low albumin reduces oncotic pressure, causing edema, and the liver increases lipoprotein production. There is also a higher risk of clots and infection.核对依据: Nephrotic syndrome · MedlinePlus (NIH) (2025)
答案: HCO₃⁻ = 37.3 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: 慢性
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: 交界性心律
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: 心室颤动
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: A · Poor ventilation causing carbon dioxide to build up
A low pH with a high PaCO₂ and normal bicarbonate is respiratory acidosis. The patient is not breathing out enough carbon dioxide, so the priority is to support ventilation and escalate.
答案: D · Red (immediate)
In JumpSTART, a respiratory rate below 15 or above 45 per minute makes the child immediate (red). Children breathe faster than adults, so the adult cut-off of 30 is not used.
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