妊娠期血容量变化为何会引起「生理性贫血」？
Why does pregnancy-related blood volume change cause 'physiologic anemia'?
妊娠期血浆容量增加约40%–50%，而红细胞总量仅增加约20%–30%，血液被相对稀释，血红蛋白浓度下降。这是适应胎儿供氧和分娩失血的生理性改变，并非真正贫血。若血红蛋白过低仍需排除缺铁等病理性因素。
In pregnancy plasma volume rises about 40%–50% while red-cell mass increases only ~20%–30%, diluting the blood and lowering hemoglobin—a physiological adaptation to fetal oxygen needs and delivery blood loss, not true anemia. Excessively low hemoglobin still warrants excluding iron deficiency.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
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《妇产科学》（谢幸、孔北华主编，第9版），人民卫生出版社
Obstetrics and Gynecology (Xie Xing & Kong Beihua, 9th ed.), People's Medical Publishing House
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787117264396（豆瓣书目条目: 妇产科学）
#妊娠期 #生理性贫血 #血容量
早产儿支气管肺发育不良（BPD）的发生机制是什么？
What is the pathogenesis of bronchopulmonary dysplasia (BPD) in preterm infants?
早产儿肺发育不成熟且常需机械通气与高氧，机械牵张和氧毒性引发肺泡上皮细胞与毛细血管内皮损伤，导致肺泡简化、肺血管发育受阻。随之出现慢性肺泡和血管异常，表现为持续氧依赖。研究表明，产前激素、温和通气和限氧可降低其发生。
Preterm lungs are immature and often exposed to mechanical ventilation and high oxygen; stretch injury and oxygen toxicity damage alveolar epithelium and capillary endothelium, simplifying alveoli and impairing vascular growth. Chronic alveolar and vascular abnormalities follow, with persistent oxygen dependence. Antenatal steroids, gentle ventilation, and oxygen targeting lower its occurrence.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
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《儿科学》（王卫平主编，第9版），人民卫生出版社
Pediatrics (Wang Weiping, 9th ed.), People's Medical Publishing House
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787117171366（豆瓣书目条目: 儿科学）
#支气管肺发育不良 #早产儿 #肺泡发育
妊娠期糖尿病孕妇在孕24–28周行75g OGTT后,空腹血糖5.3 mmol/L、服糖后1小时10.0 mmol/L、2小时8.6 mmol/L,首先应采取哪项措施?
A pregnant woman undergoes a 75 g OGTT at 24–28 weeks of gestation: fasting glucose 5.3 mmol/L, 1-hour 10.0 mmol/L, and 2-hour 8.6 mmol/L. What is the first-line management step?
上述数值中空腹、1小时及2小时血糖均超过GDM诊断界值,可确诊妊娠期糖尿病。确诊后首选医学营养治疗联合适度运动,多数患者经饮食控制即可使血糖达标。若1–2周内血糖仍不达标或出现胎儿过度生长,应及时启动胰岛素治疗。
All three values exceed the diagnostic thresholds for gestational diabetes mellitus (GDM), confirming the diagnosis. First-line management is medical nutrition therapy combined with moderate physical activity, which normalizes glucose in most patients. If targets are not met within 1–2 weeks or fetal overgrowth appears, insulin therapy should be initiated promptly.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
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出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
中华医学会妇产科学分会《妊娠期高血糖诊治指南(2022)》 ; 另见: ACOG Practice Bulletin No. 190: Gestational Diabetes Mellitus (2018)
ACOG Practice Bulletin No. 190: Gestational Diabetes Mellitus (2018) ; see also: 中华医学会妇产科学分会《妊娠期高血糖诊治指南(2022)》
#妊娠期糖尿病 #OGTT诊断与营养治疗
枸橼酸咖啡因治疗极低出生体重早产儿呼吸暂停，为何能改善36周矫正孕周时的无支气管肺发育不良存活率？
In very-low-birth-weight premature infants with apnea, how does caffeine therapy improve survival free of bronchopulmonary dysplasia at 36 weeks postmenstrual age?
咖啡因是非选择性腺苷受体拮抗剂：它解除腺苷对延髓呼吸中枢的抑制，提高中枢呼吸驱动，增强膈肌收缩力，减少呼吸暂停发作和对有创通气的需求。CAP多中心随机对照试验显示，极低出生体重儿早期使用咖啡因可显著提高36周矫正孕周的无BPD存活率、降低支气管肺发育不良发生率，且18月龄随访未发现神经发育方面的不利影响。
Caffeine is a nonselective adenosine receptor antagonist: it lifts adenosine's restraint on the medullary respiratory centers, raises central respiratory drive, strengthens diaphragmatic contractility, and reduces apneic spells and the need for invasive ventilation. In the multicenter CAP randomized trial, early caffeine in very-low-birth-weight infants significantly improved survival free of bronchopulmonary dysplasia at 36 weeks postmenstrual age and cut BPD rates, with no unfavorable neurodevelopmental findings at 18-month follow-up.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
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出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Schmidt B 等．早产儿呼吸暂停的咖啡因治疗（CAP试验）．《新英格兰医学杂志》，2006；354(20)：2112-2121
Schmidt B, et al. Caffeine therapy for apnea of prematurity (CAP trial). N Engl J Med. 2006;354(20):2112-2121
#早产儿呼吸暂停 #咖啡因 #支气管肺发育不良 #腺苷受体拮抗剂
缺铁性贫血一般应通过哪些饮食和措施改善？
How are iron-deficiency anemias generally improved through diet and measures?
增加富含血红素铁的食物（红肉、动物肝脏）并搭配维生素C促进吸收，是改善缺铁性贫血的基础。植物性铁（豆类、菠菜）吸收率较低，需配合优化。一般建议明确缺铁原因后在医生指导下补充铁剂，而非盲目进补。
Increasing heme-iron foods (red meat, liver) with vitamin C to aid absorption is the dietary basis for iron-deficiency anemia; plant iron (legumes, spinach) absorbs less and needs optimization. Identifying the cause and using supplements under medical guidance is generally advised rather than indiscriminate tonics.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
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出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
中华医学会血液学分会《铁缺乏症和缺铁性贫血诊治指南（2018）》
Chinese Society of Hematology. Guidelines for Iron Deficiency and Iron Deficiency Anemia, 2018
#缺铁性贫血 #血红素铁 #维生素C
婴幼儿缺乏维生素D为何会导致佝偻病？
Why does vitamin D deficiency cause rickets in infants?
维生素D促进肠道钙磷吸收，缺乏时血钙磷降低、骨骼矿化障碍，表现为方颅、肋串珠和O型腿等。婴幼儿户外活动少、生长快，更易不足。一般建议出生后适当补充维生素D并合理晒太阳。
Vitamin D promotes intestinal calcium and phosphate absorption; deficiency lowers their levels and impairs bone mineralization, causing craniotabes, rachitic rosary, and bowed legs. Infants grow fast with little sunlight exposure and are thus vulnerable. Supplementation and sensible sun exposure are generally advised.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
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出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
中华医学会儿科学分会《儿童维生素D缺乏性佝偻病防治建议》
Chinese Society of Pediatrics. Recommendations for Prevention of Vitamin D Deficiency Rickets
#维生素D #佝偻病 #骨骼矿化
剖宫产和阴道分娩各有哪些医学考虑？
What are the medical considerations for caesarean versus vaginal birth?
剖宫产在产道梗阻、胎儿窘迫、前置胎盘、横位等情况下是救命手术，必要时不应犹豫。但它毕竟是腹部大手术，伴随感染、出血、血栓、麻醉风险和更长恢复期，还会增加再次妊娠时子宫瘢痕、胎盘异常植入的问题。世界卫生组织指出，在人群层面剖宫产率超过约10%～15%后，并未观察到孕产妇和新生儿死亡率进一步下降，因此提倡按医学指征决定而非常规选择。
A caesarean is a life-saving operation for obstructed labour, fetal distress, placenta praevia or a transverse lie, and should not be delayed when indicated. It is nevertheless major abdominal surgery, carrying risks of infection, bleeding, thrombosis and anaesthesia plus a longer recovery, and it leaves a uterine scar that raises the chance of abnormal placental implantation in later pregnancies. WHO notes that at population level, caesarean rates above roughly 10-15% bring no further fall in maternal or newborn mortality, so the decision should follow medical indications rather than become routine.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
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Williams Obstetrics 第26版,McGraw-Hill,2022
F. G. Cunningham et al., Williams Obstetrics, 26th ed., McGraw-Hill, 2022
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL26601050W：Williams Obstetrics 26
#剖宫产 #阴道分娩 #手术指征 #WHO建议
母乳喂养对婴儿的主要益处有哪些？
What are the main benefits of breastfeeding for the infant?
母乳提供比例适宜的营养和免疫抗体（如分泌型IgA），有助于建立婴儿肠道与免疫系统并降低感染风险。母乳喂养还与较低的过敏和肥胖发生率相关。一般建议婴儿前六个月纯母乳并继续哺乳至两岁或更久。
Breast milk supplies well-balanced nutrition and immune factors such as secretory IgA, helping build the infant's gut and immunity and lowering infection risk. It is also linked to lower allergy and obesity rates. Exclusive breastfeeding for about six months, continuing to two years or beyond, is generally recommended.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Williams Obstetrics 第26版,McGraw-Hill,2022
F. G. Cunningham et al., Williams Obstetrics, 26th ed., McGraw-Hill, 2022
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL26601050W：Williams Obstetrics 26
#母乳喂养 #分泌型IgA #婴儿免疫
为什么说妊娠早期是药物致畸的敏感期？
Why is early pregnancy considered the sensitive period for drug teratogenesis?
受孕后第3至第8周是胚胎主要器官系统分化和形成的时期，细胞增殖与形态发生活跃，对外界因素（药物、感染、辐射）最为敏感。此期暴露更易干扰发育而导致结构畸形。一般建议备孕及早孕期谨慎用药并遵从产科医生评估。
From the 3rd to 8th week after fertilization, embryos undergo major organogenesis with intense cell proliferation and morphogenesis, making them most sensitive to external factors like drugs, infection, and radiation. Exposure then more readily disrupts development and causes structural defects. Cautious medication and obstetric assessment are advised in preconception and early pregnancy.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
《药理学》（杨宝峰主编，第9版），人民卫生出版社
Pharmacology (Yang Baofeng, 9th ed.), People's Medical Publishing House
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787117266048（按标识回读: 药理学（第9版））
#致畸敏感期 #器官形成 #妊娠早期
孕前补充叶酸的主要预防作用是什么？
What is the main preventive effect of periconceptional folic acid supplementation?
孕早期神经管闭合阶段对叶酸需求高，补充叶酸可显著降低胎儿神经管缺陷（如脊柱裂、无脑儿）的发生风险。一般建议计划怀孕前三个月起每日补充，并持续至孕早期。富含叶酸的食物（绿叶菜、豆类）也有辅助作用。
The neural tube closes early in pregnancy when folate demand is high; supplementation markedly lowers neural tube defects such as spina bifida and anencephaly. Guidelines advise daily folate from three months before conception through early pregnancy. Folate-rich foods (leafy greens, legumes) help as well.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
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出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
医学研究委员会维生素研究组，《神经管缺陷预防的MRC维生素研究》，柳叶刀(Lancet) 1991;338(8760):131-137
MRC Vitamin Study Research Group. Prevention of neural tube defects: results of the Medical Research Council Vitamin Study. Lancet. 1991;338(8760):131-137
#叶酸 #神经管缺陷 #孕前
产后出血为什么是全球孕产妇死亡的首要原因？
Why is postpartum haemorrhage the leading cause of maternal death worldwide?
分娩时子宫血流每分钟可达数百毫升，胎盘剥离后若子宫收缩不良（子宫收缩乏力），出血可以在很短时间内达到致命量。它是全球孕产妇死亡的首位原因，约占其中四分之一，在缺乏输血、急救和手术条件的地区尤为致命。有效措施包括第三产程主动管理：预防性使用宫缩剂（缩宫素或耐热卡贝缩宫素）、子宫按摩、早期使用氨甲环酸，以及由受过训练的助产人员接生。
Uterine blood flow at term can reach several hundred millilitres per minute, so if the uterus fails to contract after the placenta separates - uterine atony - bleeding can become fatal within minutes. It is the leading cause of maternal death globally, accounting for roughly a quarter of them, and is deadliest where transfusion, emergency care and surgery are unavailable. Proven measures include active management of the third stage: prophylactic uterotonics such as oxytocin or heat-stable carbetocin, uterine massage, early tranexamic acid, and delivery attended by a skilled birth attendant.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Williams Obstetrics 第26版,McGraw-Hill,2022
F. G. Cunningham et al., Williams Obstetrics, 26th ed., McGraw-Hill, 2022
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL26601050W：Williams Obstetrics 26
#产后出血 #子宫收缩乏力 #宫缩剂 #氨甲环酸
2岁幼儿发热伴咳嗽3天,肺部闻及固定中细湿啰音,胸片示右下肺斑片影,诊断为支气管肺炎。门诊轻症治疗的首选方案是什么?
A 2-year-old presents with 3 days of fever and cough, with fixed medium-fine moist rales on lung auscultation and a patchy infiltration in the right lower lobe on chest radiograph, consistent with bronchopneumonia. What is the first-line outpatient treatment for this mild case?
社区获得性肺炎轻症患儿若考虑细菌感染且无耐药风险,首选口服阿莫西林(或阿莫西林克拉维酸),并辅以退热、补液与气道管理;大环内酯类主要针对学龄期儿童支原体肺炎。治疗48–72小时应评估疗效,热退、一般情况好转提示有效。若持续发热或呼吸困难加重,需重新评估病原并考虑住院静脉用药。
For mild community-acquired pneumonia with presumed bacterial cause and no resistance risk, oral amoxicillin (or amoxicillin-clavulanate) is first-line, alongside antipyresis, hydration, and airway care; macrolides mainly target mycoplasma pneumonia in school-age children. Reassess at 48–72 hours—defervescence and improved condition indicate response. Persistent fever or worsening distress warrants pathogen re-evaluation and possible intravenous therapy.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Nelson Textbook of Pediatrics 第21版,Elsevier,2019
R. M. Kliegman et al., Nelson Textbook of Pediatrics, 21st ed., Elsevier, 2019
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL37477872W：Nelson Textbook of Ped
#小儿支气管肺炎 #社区获得性肺炎门诊治疗
妊娠期糖尿病应在什么孕周筛查？75 g口服葡萄糖耐量试验的结果如何判读？
At what gestational age should women be screened for gestational diabetes, and how are the results of the 75 g oral glucose tolerance test interpreted?
无高危因素的孕妇通常在孕24~28周接受75 g OGTT筛查。现行诊断采用任一时点达标即成立：空腹血糖≥5.1 mmol/L、服糖后1小时≥10.0 mmol/L或2小时≥8.5 mmol/L。确诊后首选医学营养治疗联合适度运动，血糖仍不达标者应及时启动胰岛素治疗，以降低巨大儿、肩难产及新生儿低血糖等母婴并发症。
Pregnant women without risk factors generally undergo a 75 g OGTT between 24 and 28 weeks of gestation. Current criteria diagnose gestational diabetes when any single threshold is met: fasting glucose at or above 5.1 mmol/L, one-hour value at or above 10.0 mmol/L, or two-hour value at or above 8.5 mmol/L. Medical nutrition therapy with moderate exercise comes first after diagnosis, insulin is started promptly if targets remain unmet, and such management reduces maternal and neonatal complications including macrosomia, shoulder dystocia, and neonatal hypoglycemia.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
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出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
中华医学会妇产科学分会产科学组《妊娠期高血糖诊治指南（2022）》
Guideline for the Diagnosis and Management of Hyperglycemia in Pregnancy (2022), Chinese Society of Obstetrics and Gynecology
#妊娠期糖尿病 #糖耐量试验
孩子发热时突发惊厥，家长在现场应该如何处置？哪些特征提示复杂性热性惊厥？
What should parents do on the spot when a child convulses during fever, and which features mark a febrile seizure as complex?
发作时把孩子置于侧卧位、解开衣领保持气道通畅，记录惊厥起止时间，切勿向口中塞入任何物品或用力按压肢体。若发作超过5分钟仍未缓解应立即呼叫急救，由医护人员酌情使用地西泮等药物止惊。全身性发作持续不足15分钟且24小时内不再复发者为单纯型；发作超过15分钟、呈局灶性表现或24小时内反复出现即属复杂型，需要进一步检查并随访癫痫发生风险。
During a fit, lay the child on their side, loosen the collar to keep the airway clear, and time the event; never force anything into the mouth or restrain the limbs. Call emergency services if the seizure lasts beyond five minutes, letting clinicians give anticonvulsants such as diazepam when needed. A generalized seizure under fifteen minutes that does not recur within 24 hours is simple; one lasting over fifteen minutes, showing focal features, or repeating within 24 hours is complex and warrants further evaluation plus follow-up for epilepsy risk.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
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出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
中华医学会儿科学分会神经学组《热性惊厥诊断治疗与管理专家共识（2017）》
Expert Consensus on the Diagnosis, Treatment and Management of Febrile Seizures (2017), Neurology Group of the Chinese Pediatric Society
#热性惊厥 #急救处理
宝宝出生后为什么要常规打一针维生素K？纯母乳喂养的孩子之后还要注意什么？
Why is a routine vitamin K injection given right after birth, and what should parents of exclusively breastfed infants pay attention to?
维生素K经胎盘转运很少，新生儿肠道尚未建立产维生素K的菌群，凝血因子Ⅱ、Ⅶ、Ⅸ、Ⅹ合成不足，可发生维生素K缺乏性出血，严重者为颅内出血甚至死亡。出生后一次性肌注0.5–1 mg维生素K₁能有效预防。纯母乳喂养儿摄入量低、储备消耗快，是主要高危人群，随访中应注意观察有无出血表现。
Vitamin K crosses the placenta poorly and the newborn gut lacks the bacteria that synthesize it, so production of clotting factors II, VII, IX and X falls short and vitamin K deficiency bleeding can develop, with severe cases causing intracranial hemorrhage and even death. One intramuscular dose of 0.5-1 mg at birth prevents it effectively. Exclusively breastfed infants take in little vitamin K and deplete their stores fastest, making them the principal risk group whose follow-up visits should watch for any bleeding signs.
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《尼尔森儿科学》（Nelson Textbook of Pediatrics，Kliegman主编，第21版，Elsevier，2019）
Nelson Textbook of Pediatrics, 21st ed. (Kliegman), Elsevier, 2019
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#维生素K缺乏性出血 #新生儿护理 #一级预防