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 34 道练习题,完整解答附在最后。
How should the ear be positioned when taking a tympanic temperature in an adult?
At the start of a shift, which task should the nurse do first?
Where should the drainage bag of an indwelling urinary catheter be kept?
In US nursing practice, which task should the RN not assign to an LPN/LVN?
A child with fever and headache develops a purple rash that does not fade when pressed with a glass. What should the nurse do?
An 85-year-old resident becomes newly confused and is falling, but has no fever. Which cause should the nurse consider first?
Which examination findings suggest a large pleural effusion on one side?
Which action is most important in protecting a patient with severe neutropenia from infection?
When should the nurse check the glucose before giving a mealtime dose of rapid-acting insulin (such as lispro)?
A patient in DKA is receiving IV fluids and insulin. The glucose has fallen to about 220 mg/dL (12.2 mmol/L), but the anion gap is still high. What change would the nurse expect?
When should a patient take a once-daily proton pump inhibitor such as omeprazole?
某药分布容积为 40 L,生物利用度为 100%。要达到 2 mg/L 的目标血浆浓度,负荷剂量应为多少?
A patient with chest pain has a first troponin result within the normal range one hour after the pain started. Why is a repeat test arranged?
一名哮喘患者的峰流速为其最佳值的 40%,呼吸频率 28 次/分,不能说完整句子。SpO₂ 94%。该次发作应如何分级?
A bladder scan straight after voiding shows 450 mL of urine still in the bladder. What does this show?
一名患者昨天刚建立左臂动静脉内瘘,需要做常规抽血。最重要的指示是什么?
Which advice helps a patient with haemorrhoids?
全身麻醉期间,一名患者出现下颌强直、呼气末 CO₂ 升高和心动过速,随后体温迅速上升。哪种药物是特异性治疗?
A woman with pre-eclampsia is on magnesium sulfate. Why does the nurse monitor her urine output closely?
A deceleration lasts 3 minutes before the baseline recovers. How is this classified?
A child has scabies. Which plan is correct?
一名法洛四联症的幼儿剧烈哭闹,随后出现严重发绀并变得软弱无力。护士应首先做什么?
How does conduct disorder differ from oppositional defiant disorder?
Three weeks after her husband died, a woman says she sometimes briefly hears him call her name at home. She is otherwise eating, sleeping and coping. How should the nurse interpret this?
练习题(虚构数值,不作为临床指导)。 一位患者的体温为 103.5 °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)。 一次输注从 17:40 开始,到次日早晨 04:25 结束(24 小时制)。它运行了多少小时t?答案以小数表示小时数,取到两位小数。
一支肾上腺素预充式注射器标示为 1:10 000(0.1 mg/mL)。医嘱为心脏骤停时 1 mg 静脉注射(IV)。你应给多少体积 V?
处方剂量为 0.52 mg。安瓿每 mL 含 4000 微克。请用 1 mL 注射器抽取剂量:应给多少体积 V?
用滴系数为 20 滴/mL 的输液器在 5 小时内输入 1000 mL。求滴速 R(滴/分)。 取整到最接近的整数。
一袋液体在 100 mL 中含药 500 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)。 记录显示了一名患者在一个 12 小时班次中的出入量。患者体重 72 kg。求平均尿量 U,以 mL/kg/h 计。 保留两位小数。
练习题(虚构数值,不作为临床指导)。 一袋 1000 mL 的液体用输液泵以 120 mL/h 输注。到 06:30 时已输入 350 mL。还要多少小时 t 袋子才会输完? 保留一位小数。
练习题(虚构数值,不作为临床指导)。 一位患者的脉搏为 146 次/分,血压为 120/72 mmHg。求休克指数SI = HR/SBP。取到两位小数。
练习题(虚构数值,不作为临床指导)。 用 Morse 跌倒评分评估一位练习患者:过去 3 个月内的跌倒史: 否; 次要诊断: 是; 行走辅助: 扶着家具; 静脉输液或封管: 否; 步态: 虚弱; 精神状态: 高估或忘记自身局限。使用分界值 0–24 低,25–44 中度,45 或以上高,点击跌倒风险等级。
答案: C · Gently pull the outer ear up and back
Pulling the pinna up and back straightens the adult ear canal so the probe points at the eardrum. In young children the pinna is pulled down and back instead.
答案: D · Give the first IV antibiotic dose to a patient with suspected sepsis
In sepsis antibiotics are time-critical, and every hour of delay increases the risk of death. Routine tasks are done afterwards.
答案: D · Below the level of the bladder and off the floor
Keeping the bag below the bladder prevents backflow of urine into the bladder, and keeping it off the floor prevents contamination. Both reduce the risk of catheter-associated urinary tract infection.
答案: A · The initial admission assessment of a new patient with suspected sepsis
The initial assessment of a new, potentially unstable patient is an RN responsibility. LPNs/LVNs can give routine medications, perform routine procedures and reinforce teaching for stable patients.
答案: B · Treat it as an emergency and escalate at once
A non-blanching rash with fever can be a sign of meningococcal septicemia, which can progress within hours. Urgent escalation for antibiotics and supportive care is needed.
答案: A · An infection, such as a urinary tract infection, presenting atypically
Older adults often present with confusion or falls rather than fever when they have an infection. New confusion is a change that needs assessment for causes such as infection, dehydration or medication.
答案: C · Dull percussion and reduced breath sounds over the lung base
Fluid in the pleural space muffles breath sounds and makes percussion stony dull. A large effusion may push the trachea away from the affected side.
答案: C · Strict hand hygiene by everyone who has contact with the patient
Hand hygiene is the single most effective measure to protect neutropenic patients. Rectal procedures and IM injections are avoided because they can cause mucosal or tissue injury and bleeding.
答案: A · Just before the meal, giving insulin when the food is ready
Rapid-acting insulin starts working within about 15 minutes, so glucose is checked before the meal and the insulin is given when the meal is available, usually within 15 minutes of eating. Giving it without food can cause hypoglycemia.
答案: A · Add dextrose to the IV fluids and continue the insulin
The glucose usually falls before the ketoacidosis resolves. Dextrose is added so insulin can continue, clearing ketones without causing hypoglycemia, until the anion gap closes. Stopping insulin too early lets ketoacidosis return.
答案: A · About 30–60 minutes before the first meal of the day
Proton pump inhibitors block pumps that are active, so they work best when taken before breakfast. Food then activates the pumps when the drug level is high.
答案: A · 80 mg
负荷剂量 = 40 L × 2 mg/L = 80 mg。负荷剂量取决于 Vd,而维持剂量取决于清除率。
答案: B · Troponin may take a few hours to rise after muscle damage
Troponin starts to rise within hours of myocardial injury, so a very early result can be normal. Protocols use serial measurements at set intervals, with the ECG and clinical picture, to diagnose or exclude MI. A rising pattern supports acute injury.
答案: C · 急性重度哮喘
在常用指南(如 BTS/SIGN)中,峰流速为最佳值的 33–50%、呼吸频率 25 次/分或以上、心率 110 次/分或以上,或不能说完整句子,提示急性重度哮喘。危及生命的特征包括峰流速低于 33%、SpO₂ 低于 92%、“沉默肺”、发绀、衰竭或意识混乱;濒死性哮喘是指 PaCO₂ 升高或需要通气。
答案: A · The bladder is not emptying properly
A large post-void residual means incomplete emptying, for example from obstruction or a weak detrusor. It raises the risk of infection and overflow incontinence and may need intermittent catheterisation or treatment of the cause.
答案: D · 使用右臂;检查左手的循环和震颤
新内瘘应避免受压和穿刺。护士检查震颤和血管杂音,并检查手部的温度、颜色和感觉,因为内瘘可能“盗取”手部的血液。内瘘通常需要数周成熟后才能用于透析。
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 · 丹曲林
恶性高热的治疗包括停用触发药物、用 100% 氧气过度通气、静脉给予丹曲林(减少肌质网钙释放)、主动降温,以及治疗高钾血症和心律失常。琥珀酰胆碱是触发因素。
答案: D · Magnesium is cleared by the kidneys, so oliguria raises the risk of toxicity
Magnesium is cleared by the kidneys, so oliguria, which is common in pre-eclampsia, allows levels to rise. The nurse also monitors reflexes, respiratory rate and level of consciousness.
答案: C · A prolonged deceleration
A prolonged deceleration lasts at least 2 minutes but less than 10. A decrease of 10 minutes or more is a baseline change. The cause, such as hypotension or tachysystole, should be found and corrected.
答案: D · Treat the child and all close contacts at the same time, and wash bedding and clothes
All household and close contacts are treated at the same time, even without symptoms, because itching can take weeks to develop. The cream or lotion is applied to the whole body as directed, and itching may persist for a few weeks after successful treatment.
答案: A · 将孩子置于膝胸卧位,保持其平静并呼叫援助
在缺氧发绀发作(“法洛”发作)时,膝胸卧位可增加体循环阻力和肺血流。安抚孩子,给氧并紧急呼叫援助;可能医嘱使用吗啡等药物。
答案: C · Conduct disorder involves violating others' rights, such as cruelty, theft or fire setting
Oppositional defiant disorder involves angry, argumentative and defiant behaviour. Conduct disorder is more serious, with aggression, destruction of property, deceit, theft or serious violation of rules.
答案: D · Brief experiences like this can be part of normal grief
Briefly hearing or sensing the deceased is common in bereavement and is not usually a sign of mental illness. The nurse listens, normalises the experience and watches for signs of more complicated grief or depression.
答案: T = 39.7 °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: t = 10.75 h
24 小时制:下午 1 点起,小时数加 12(下午 3:45 = 15:45)。午夜到凌晨 12:59 为 00:00–00:59,中午 12:00–12:59 仍为 12:00–12:59。反过来换算时,13–23 点减 12 并标为下午;00 点变为凌晨 12 点。跨午夜计算时间要分两段:先算到 24:00(00:00),再从 00:00 算起。
答案: V = 10 mL
Solution strengths: a percentage strength is grams per 100 mL, so 1% = 1 g/100 mL = 10 mg/mL. A ratio strength 1:1000 means 1 g in 1000 mL = 1 mg/mL; 1:10 000 is 0.1 mg/mL. For a dilution the amount of drug stays the same: C₁·V₁ = C₂·V₂.
美国的标签现在标示 mg/mL(1 mg/mL = 1:1000;0.1 mg/mL = 1:10 000)。切勿静脉推注 1 mg/mL 的肾上腺素。
答案: V = 0.13 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。
答案: R = 67 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:67 滴/分。
答案: D = 125 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: U = 1.3 mL/kg/h
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: t = 5.4 h
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。
约为 5 h 25 min,所以袋子大约在 11:55 输完。
答案: SI = 1.22
血压数值:脉压 PP = SBP − DBP。平均动脉压 MAP ≈ (SBP + 2·DBP)/3 = DBP + PP/3,这是基于正常心率下心脏每搏约有三分之二时间处于舒张期的估算(心率快时准确性下降);MAP 至少约 65 mmHg 是常用的器官灌注目标。休克指数 SI = 心率/SBP,正常约为 0.5–0.7;高于约 1 是休克的警示信号。
1 或更高:在这个练习病例中是休克的警示信号。
答案: 高风险
Morse 跌倒评分:六个条目。跌倒史:否 0 分,是 25 分。次要诊断:否 0 分,是 15 分。行走辅助:无、卧床休息或护士协助 0 分;拐杖、手杖或助行器 15 分;扶着家具 30 分。静脉输液或封管:否 0 分,是 20 分。步态:正常、卧床休息或轮椅 0 分;虚弱 10 分;受损 20 分。精神状态:了解自身局限 0 分;高估或忘记自身局限 15 分。总分为 0 至 125。各医院的风险分界值不同;常用的一套是 0–24 低风险,25–44 中度风险,45 及以上为高风险。
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