感染控制与患者安全
方法
- 对每位患者都从标准预防开始:手卫生、针对预期暴露的个人防护装备、安全使用锐器。
- 按传播途径追加预防措施:接触传播(隔离衣、手套)、飞沫传播(外科口罩)、空气传播(N95、负压病房)。
- 保持无菌物品的无菌状态:如有疑问就视为不无菌;更换,绝不擦拭。
- 预防环境中的伤害:防跌倒措施,约束仅作为最后手段,火灾时用 RACE 和 PASS。
- 核对给药的正确原则、两个身份识别信息,以及对高警示药物的额外保障;报告差错和险兆事件。
公式表、每个专题的关键方法步骤和 40 道练习题,完整解答附在最后。
根据《2005年心智能力法》(Mental Capacity Act 2005,英格兰和威尔士),对成人心智能力的初始假定是什么?
On the morning of surgery, a patient who signed the consent form says they do not understand what the operation involves. What should the nurse do?
“Tall Man”大写字母标注法(如 hydrOXYzine 和 hydrALAZINE)的目的是什么?
给一名有窒息风险的清醒患者口服药物。哪种做法最安全?
Before giving a medication to a child, which check is especially important?
四名患者同时到达急诊科。应先看谁?
Why are alternate sutures sometimes removed first when taking out stitches?
A patient has a painful, punched-out ulcer on the toes, with a cold, pale foot and weak foot pulses. Which type of ulcer is most likely?
A patient with diabetes is found unconscious with a blood glucose of 38 mg/dL (2.1 mmol/L). Which treatment is appropriate?
Four patients had a thyroidectomy earlier today. Which result should the nurse act on first?
A child is starting methylphenidate for ADHD. Which advice is appropriate?
A patient receiving a phenylephrine infusion has a rise in blood pressure and a fall in heart rate. What is the best explanation?
A patient with heart failure takes furosemide once a day. When is the best time to take it?
A patient with both COPD and heart disease is more breathless, with bilateral basal crackles, raised JVP, ankle swelling and a markedly raised NT-proBNP. Which problem is most likely driving this episode?
哪种电解质模式是 Addison 病的典型表现?
A patient with a brain injury has a mean arterial pressure of 80 mmHg and an ICP of 25 mmHg. How should the nurse interpret this?
Why is the time a surgical limb tourniquet is inflated carefully recorded?
A patient with gallstones has a temperature of 39 °C with rigors, jaundice and right upper abdominal pain. What should the nurse suspect?
Which reflex causes the newborn's toes to fan out when the sole is stroked from heel to toe?
A breastfeeding mother asks whether she can have a progestin-only implant before discharge. Which reply is best?
Ten minutes into a blood transfusion, a child develops fever, chills and back pain. What should the nurse do first?
A 10-year-old with cystic fibrosis is going to play football on a hot day. What should the nurse teach?
A man taking risperidone reports breast enlargement and his partner says he has lost interest in sex. Which effect is the most likely cause?
A patient with alcohol dependence is confused, unsteady on his feet and has abnormal eye movements. Why is it urgent to give thiamine?
练习题(虚构数值,不作为临床指导)。 一位患者的体温为 100.8 °F。用 °C = (°F − 32) × 5/9 把它换算为摄氏度T。取到一位小数。
练习题(虚构数值,不作为临床指导)。 一个班次中,患者摄入了3 tbsp / 液体营养补充剂, ½ fl oz / 果汁, 1½ 杯 / 茶, 1 tsp / 止咳糖浆。按给出的等量关系,求以 mL 表示的口服总摄入量V。
一名体重 8 kg 的儿童按 7.5 mg/kg 处方用药。原液浓度为 10 mg/mL。请抽取剂量:应给多少体积 V?
一名体重 18 kg 的儿童,医嘱为口服混悬液每次 20 mg/kg,该混悬液每 1 mL 含 40 mg。你应给多少体积 V?
用滴系数为 10 滴/mL 的输液器在 6 小时内输入 500 mL。求滴速 R(滴/分)。 取整到最接近的整数。
一袋液体在 250 mL 中含药 100 mg,以 25 mL/h 的速度输注。患者每小时获得多少毫克 D?
练习题(虚构数值,不作为临床指导)。 一份含 50 单位普通胰岛素、容量 50 mL 的输液以 4 mL/h 输注。患者每小时接受多少单位 D?
练习题(虚构数值,不作为临床指导)。 一袋中含dopamine 400 mg,容量 250 mL。医嘱为 8 mcg/kg/min,患者体重 91 kg。输液泵速率 R 应设为多少 mL/h? 保留一位小数。
练习题(虚构数值,不作为临床指导)。 记录显示了一名患者在一个 12 小时班次中的出入量。静脉输液在整个班次中按所示速率输注。求总入量 I,以 mL 计。 冰屑按其体积的一半计。
练习题(虚构数值,不作为临床指导)。 一袋 1000 mL 的液体于 13:00 开始用输液泵以 50 mL/h 输注。到 18:00 时袋中还剩多少 mL V?
练习题(虚构数值,不作为临床指导)。 用 Braden 量表评估一位练习患者:感觉知觉: 无损害; 潮湿程度: 持续潮湿; 活动: 卧床不起; 活动能力: 不受限制; 营养: 充足; 摩擦力和剪切力: 潜在问题。求 Braden 总分B。
练习题(虚构数值,不作为临床指导)。 对这些观察结果使用 NEWS2 图表(SpO₂ 量表 1):呼吸频率 32 次/分,SpO₂ 96%正在补充吸氧,血压 118/70 mmHg,脉搏 88 次/分,清醒,体温 37.0 °C。患者属于哪个临床风险组?点击它。
某练习动脉血气显示 pH 7.32,PaCO₂ 32 mmHg (4.3 kPa),HCO₃⁻ 16 mmol/L。原发性紊乱是代谢性酸中毒。代偿到什么程度?点选你的答案。
某练习血气显示呼吸性酸中毒:pH 7.23,PaCO₂ 66 mmHg (8.8 kPa),HCO₃⁻ 27 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。
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。QRS 波群是规则的:求出心室率(单位:次/分,1500 法,取整数)。
答案: B · 除非证明其缺乏能力,否则推定该成人具有能力
该法以推定具有能力为起点。不能仅仅因为年龄、外表或一个不明智的决定就认为一个人缺乏能力。
答案: B · Inform the surgeon so consent can be discussed again before surgery
Consent is valid only if the patient understands the procedure, risks and alternatives. The nurse advocates for the patient and asks the person doing the procedure to discuss it again.
答案: C · 使外观相似的药名更容易区分
Tall Man 标注法把相似药名中不同的字母用大写表示,使工作人员在阅读标签、屏幕和医嘱时能注意到差异。
答案: C · 让患者坐直,一次给一片药
直立体位和一次给一种药可降低窒息风险。只有在药房确认安全后才可碾碎,因为一些缓释和肠溶制剂碾碎后会有危险。
答案: A · That the dose is correct for the child’s weight
Pediatric doses are usually calculated by weight, and errors can cause serious harm. The nurse checks the dose against the child’s weight and the safe range before giving it.
答案: D · 一名 2 岁的儿童,流口水,身体前倾,有喘鸣
流口水、前倾(三脚架)姿势和喘鸣提示严重的上气道梗阻,如会厌炎,可能迅速变成完全梗阻。应让孩子保持平静,在气道专家到场之前不要检查咽喉。
答案: C · To check the wound stays closed before removing the rest
Removing alternate sutures allows the nurse to see whether the wound edges stay together. If they begin to separate, the remaining sutures can be left and the team informed.
答案: C · An arterial ulcer
Arterial ulcers are usually on the feet or toes, painful and punched-out, with signs of poor perfusion. Venous ulcers are usually around the ankle, shallow and associated with swelling and skin staining.
答案: A · Glucagon by injection, or IV dextrose as prescribed
A patient who cannot swallow safely must not receive anything by mouth because of the risk of aspiration. Glucagon (injected or intranasal) or IV dextrose raises the glucose; once awake and able to swallow, the patient is given oral carbohydrate and a snack.核对依据: Hypoglycemia · MedlinePlus (NIH); Low blood sugar · MedlinePlus (NIH) (2026)
答案: A · Calcium 7.2 mg/dL (1.8 mmol/L) with tingling lips
Hypocalcemia after thyroid surgery, from parathyroid injury, can progress to tetany and laryngospasm. Tingling lips are an early sign, so the nurse assesses the airway and Chvostek and Trousseau signs and reports at once. The other results are expected after surgery.核对依据: Calcium Blood Test · MedlinePlus (NIH) (2024)
答案: C · Give doses early in the day and monitor appetite and growth
Stimulants can cause insomnia, so doses are given in the morning and early afternoon. Reduced appetite can slow growth, so height and weight are tracked.
答案: C · Alpha-1 vasoconstriction raises blood pressure and causes reflex bradycardia
Phenylephrine is a pure alpha-1 agonist with little direct cardiac action. The higher blood pressure activates baroreceptors, which increase vagal tone and slow the heart.
答案: C · In the morning, to avoid needing the toilet at night
Loop diuretics produce a brisk diuresis that lasts several hours. Taking them in the morning (and a second dose by early afternoon if prescribed) avoids nocturia, broken sleep and night-time falls.
答案: A · Decompensated heart failure
Basal crackles, raised JVP, oedema and a high natriuretic peptide point to heart failure rather than a COPD exacerbation alone. Distinguishing them matters, because treatment (diuretics and HF drugs versus bronchodilators and steroids) is different. Both may occur together.
答案: D · 低钠高钾
醛固酮缺乏导致失钠、钾潴留,引起低钠血症和高钾血症。皮质醇缺乏还会加上低血糖和低血压。
答案: C · The cerebral perfusion pressure is 55 mmHg, below the usual target
CPP = MAP − ICP, so 80 − 25 = 55 mmHg. A CPP below about 60 mmHg risks brain ischaemia. The team will act to lower the ICP and support the MAP.
答案: A · Long inflation can cause nerve and muscle damage
A tourniquet creates a bloodless field but causes limb ischaemia. Inflation time and pressure are recorded and the surgeon is told at set intervals, as long inflation can damage nerves and muscle.
答案: D · Ascending cholangitis
Fever, jaundice and right upper quadrant pain suggest infection of an obstructed bile duct. It can rapidly cause sepsis and needs blood cultures, IV antibiotics, fluids and urgent biliary drainage, usually by ERCP.
答案: C · Babinski reflex
The Babinski reflex, fanning of the toes with dorsiflexion of the big toe, is normal in infants until about 1 year. Pressing the sole near the toes gives the plantar grasp instead.
答案: D · Progestin-only methods are compatible with breastfeeding
Progestin-only methods such as implants, injections and pills do not have a clinically important effect on milk supply. Oestrogen-containing methods are usually avoided in the first weeks.
答案: D · Stop the transfusion
Fever, chills and back pain early in a transfusion may signal an acute haemolytic reaction. The transfusion is stopped, the line kept open with saline using new tubing, vital signs checked, the doctor called and the blood bag kept for testing.
答案: B · Drink more and add extra salt, because more salt is lost in sweat
Children with CF lose much more salt in sweat than other children and can become salt-depleted and dehydrated in heat or exercise. Extra fluids and salt are advised; exercise is encouraged because it helps airway clearance.
答案: C · Raised prolactin
Blocking dopamine in the tuberoinfundibular pathway raises prolactin. This can cause gynaecomastia, galactorrhoea, menstrual problems and sexual dysfunction; risperidone and first-generation antipsychotics commonly cause it.
答案: A · Wernicke's encephalopathy can be reversed if treated early, but may otherwise lead to permanent Korsakoff syndrome
Wernicke's encephalopathy is an emergency caused by thiamine deficiency. Prompt high-dose thiamine can reverse it, but delay can lead to Korsakoff syndrome with lasting memory loss, or death.
答案: T = 38.2 °C
温度:°C = (°F − 32) × 5/9,°F = °C × 9/5 + 32。从 °F 换算时先减 32 再乘,从 °C 换算时先乘再加 32。快速核对:37 °C 为 98.6 °F,每 1 °C 相当于 1.8 °F。
答案: V = 425 mL
家用计量和体重:护理考试使用取整的等量关系:1 茶匙(tsp)= 5 mL,1 汤匙(tbsp)= 15 mL = 3 tsp,1 液量盎司(fl oz)= 30 mL = 2 tbsp,1 杯 = 8 fl oz = 240 mL。体重方面,1 kg = 2.2 lb,1 lb = 16 oz;长度方面,1 英寸 = 2.54 cm。设置换算时,要让你不需要的单位相互约去。
答案: V = 6 mL
抽取剂量:体积 = (处方剂量/药物浓度) × 药物体积。先换算成相同的单位,再检查该体积是否适合注射器,并落在它的某一个刻度上。
在这支 10 mL 的注射器上,每条小刻度线代表 0.2 mL。
答案: V = 9 mL
剂量计算:给药量等于医嘱剂量除以现有药物的规格,再乘以该规格对应的量:给药量 = (医嘱剂量/储备规格) × 储备体积。始终统一单位(先把 g 换成 mg,mg 换成 mcg),并检查答案是否合理。
答案: R = 14 gtt/min
输注速率:输液泵按 mL/h = 体积/时间(小时)设定。重力滴注按每分钟滴数计:gtt/min = 体积 (mL) × 滴系数 (gtt/mL)/时间 (min)。 滴系数印在输液器包装上:普通输液器为 10、15 或 20 gtt/mL(输血器在美国常为 10 gtt/mL,在英国为 15),微量输液器为 60 gtt/mL。务必使用题目或包装给出的滴系数。
床旁取最接近的整滴:14 滴/分。
答案: D = 10 mg/h
输注速率:输液泵按 mL/h = 体积/时间(小时)设定。重力滴注按每分钟滴数计:gtt/min = 体积 (mL) × 滴系数 (gtt/mL)/时间 (min)。 滴系数印在输液器包装上:普通输液器为 10、15 或 20 gtt/mL(输血器在美国常为 10 gtt/mL,在英国为 15),微量输液器为 60 gtt/mL。务必使用题目或包装给出的滴系数。
答案: D = 4 件/h
肝素和胰岛素输注:浓度 = 袋中单位数/袋容量 (units/mL)。泵速 (mL/h) = 每小时单位数/浓度,每小时单位数 = mL/h × 浓度。按体重给药时,先求 units/h = units/kg/h × 体重。推注体积 = 所需单位数/药瓶规格。 这些数字仅供练习;在临床工作中务必遵循当地规程,高危剂量须经双人核对。
答案: R = 27.3 mL/h
滴定输注:先求以 mcg/mL 计的浓度(mg × 1000/mL)。按体重给药时,mcg/min = mcg/kg/min × 体重。然后 mL/h = mcg/min × 60/浓度。反推时,mcg/kg/min = mL/h × 浓度/(60 × 体重)。 这些数字仅供练习;在临床工作中务必遵循当地规程,高危剂量须经双人核对。
答案: I = 2160 mL
出入量:入量计入所有进入体内的液体(口服液体、静脉输液、静脉用药及冲管液、管饲);冰屑按其体积的一半计。出量计入尿液、引流液、呕吐物和其他丢失。平衡 = 总入量 − 总出量;平衡为负表示净丢失。 这些数字仅供练习;在临床工作中务必遵循当地规程,高危剂量须经双人核对。
答案: V = 750 mL
输液时间:时间 (h) = 待输体积 (mL)/速率 (mL/h);使用袋中剩余的体积,而不是袋的容量。已输入体积 = 速率 × 时间。把小数小时换算为小时和分钟时,用小数部分 × 60(0.5 h = 30 min,而不是 50 min)。 这些数字仅供练习;在临床工作中务必遵循当地规程,高危剂量须经双人核对。
答案: B = 15
Braden 量表:评估压力性损伤风险的六个分项。感觉知觉、潮湿程度、活动、活动能力和营养各评 1 至 4 分,从最差水平(1)到无问题(4);摩擦力和剪切力评 1 至 3 分。总分为 6 至 23,总分越低风险越高。常用分级:19–23 无风险,15–18 轻度风险,13–14 中度风险,10–12 高风险,9 分及以下为极高风险。
答案: 中
NEWS2(国家早期预警评分 2,英国皇家内科医师学会 2017):按图表为七个参数分别评分(呼吸频率、量表 1 的 SpO₂、吸空气还是吸氧、收缩压、脉搏、按 ACVPU 量表评定的意识状态和体温),然后把分数相加。临床风险:0–4 为低;任何单项参数得 3 分为中低;5–6 为中;7 或以上为高。总分 5 或以上需要紧急响应。
总分 5 或以上需要紧急的临床响应。
答案: 部分代偿
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: 急性
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: 心房扑动,4:1 传导
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: 心室率 = 58 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)。
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