心血管疾病 Medicine & Health

8 个科学问题 · 医学健康 Medicine & Health

本页目录

肾素-血管紧张素-醛固酮系统(RAAS)是如何参与血压升高的?

How does the renin-angiotensin-aldosterone system (RAAS) contribute to elevated blood pressure?

肾脏血流减少时释放肾素,将血管紧张素原转化为血管紧张素Ⅰ,再经血管紧张素转换酶生成血管紧张素Ⅱ。血管紧张素Ⅱ强力收缩血管并刺激醛固酮分泌,促进钠水潴留,从而升高血压。长期RAAS过度激活会推动高血压并损伤心肾,这也是普利类与沙坦类药物的作用靶点。
Reduced renal perfusion triggers renin release, cleaving angiotensinogen to angiotensin I, which ACE converts to angiotensin II. Angiotensin II potently vasoconstricts and stimulates aldosterone, promoting sodium and water retention and raising blood pressure. Chronic RAAS overactivation drives hypertension and end-organ damage—the basis for ACE inhibitors and ARBs.
难度 专业 · 适合 初中(12-15) CC BY 4.0 · 已核验 · Verified 2026-10-03
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《生理学》(朱大年、王庭槐主编,第9版),人民卫生出版社

Physiology (Zhu Danian & Wang Tinghuai, 9th ed.), People's Medical Publishing House

#RAAS #肾素 #醛固酮 #高血压

急性心肌梗死进行再灌注治疗的时间窗为何如此关键?

Why is the time window for reperfusion therapy in acute myocardial infarction so critical?

冠状动脉急性闭塞后,心肌细胞在缺血约30分钟即开始出现不可逆损伤,若6小时内未恢复血流将造成大面积心肌坏死。研究表明,尽早开通血管(溶栓或经皮冠状动脉介入)可挽救缺血但仍存活的心肌,显著缩小梗死面积并改善预后。一般建议疑似ST段抬高型心肌梗死者在发病12小时内尽快再灌注,且越早越好。
After acute coronary occlusion, irreversible myocardial injury begins within about 30 minutes, and prolonged ischemia beyond roughly 6 hours causes extensive necrosis. Evidence shows early restoration of flow (thrombolysis or primary PCI) salvages ischemic-but-viable myocardium, limits infarct size, and improves outcomes. Current guidance favors reperfusion within 12 hours of STEMI, the sooner the better.
难度 专业 · 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。

Ibanez B等,《2017 ESC急性ST段抬高型心肌梗死患者管理指南》,欧洲心脏杂志(Eur Heart J) 2018;39(2):119-177

Ibanez B, et al. 2017 ESC Guidelines for the management of acute myocardial infarction in patients presenting with ST-segment elevation. Eur Heart J. 2018;39(2):119-177

#心肌梗死 #再灌注 #时间窗

动脉粥样硬化中「易损斑块」为何容易破裂并引发急性事件?

Why are vulnerable plaques in atherosclerosis prone to rupture and trigger acute events?

易损斑块通常具有大的脂质坏死核心、薄纤维帽和密集的巨噬细胞浸润。炎症激活使基质金属蛋白酶降解纤维帽胶原,加上血流剪切力作用,斑块易于破裂。破裂后内皮下组织暴露激活血小板与凝血级联,迅速形成血栓堵塞血管,造成急性冠脉综合征或卒中。
Vulnerable plaques feature a large lipid-rich necrotic core, a thin fibrous cap, and dense macrophage infiltration. Inflammation activates matrix metalloproteinases that degrade cap collagen, and hemodynamic shear stress makes rupture more likely. Rupture exposes subendothelial tissue, activating platelets and coagulation to form an occlusive thrombus causing acute coronary syndrome or stroke.
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。

Libby P,《急性冠脉综合征的机制及其治疗意义》,新英格兰医学杂志(NEJM) 2013;368(21):2004-2013

Libby P. Mechanisms of Acute Coronary Syndromes and Their Implications for Therapy. N Engl J Med. 2013;368(21):2004-2013

#易损斑块 #动脉粥样硬化 #血栓

他汀类药物降低胆固醇的主要作用机制是什么?

What is the main mechanism by which statins lower cholesterol?

他汀类药物竞争性抑制肝细胞内的HMG-CoA还原酶,这是胆固醇合成通路中的限速酶,从而减少内源性胆固醇生成。肝脏胆固醇下降会上调低密度脂蛋白受体,加速血液中低密度脂蛋白胆固醇的清除。研究表明,降低低密度脂蛋白胆固醇可稳定动脉粥样硬化斑块并减少心血管事件。
Statins competitively inhibit HMG-CoA reductase, the rate-limiting enzyme in hepatic cholesterol synthesis, reducing endogenous cholesterol production. Lower hepatic cholesterol upregulates LDL receptors, accelerating clearance of circulating LDL cholesterol. Lowering LDL cholesterol has been shown to stabilize plaques and reduce cardiovascular events.
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。

Jacobson TA等,《美国国家脂质协会以患者为中心的血脂异常管理建议(第1部分)》,临床脂质学杂志(J Clin Lipidol) 2014;8(5):473-488

Jacobson TA, et al. National Lipid Association Recommendations for Patient-Centered Management of Dyslipidemia: Part 1. J Clin Lipidol. 2014;8(5):473-488

#他汀 #胆固醇 #HMG-CoA还原酶

临床上诊断高血压的血压阈值是多少?

What blood pressure threshold is used to diagnose hypertension clinically?

在未使用降压药物的情况下,非同日三次测量诊室收缩压≥140 mmHg和(或)舒张压≥90 mmHg,一般可诊断为高血压。家庭自测或动态血压的常用诊断标准略有不同。确诊后一般建议由医生评估并制定个体化管理方案。
Hypertension is generally diagnosed when, off antihypertensive medication, office systolic blood pressure is at least 140 mmHg and/or diastolic blood pressure at least 90 mmHg on three separate occasions. Home and ambulatory monitoring use slightly different thresholds. Confirmation should be followed by a clinician's individualized assessment.
难度 进阶 · 适合 大众 CC BY 4.0 · 已核验 · Verified 2026-11-03
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葛均波 等主编,《内科学》第9版,人民卫生出版社,2018

Ge Junbo et al. eds., Internal Medicine, 9th ed., PMPH, 2018

#高血压 #诊断标准 #血压

心房颤动为何会增加脑卒中的风险?

Why does atrial fibrillation increase the risk of stroke?

心房颤动时心房失去有效收缩,血液在心房(尤其左心耳)淤滞易形成血栓。血栓脱落后随循环进入脑动脉可堵塞血管,导致心源性脑栓塞。研究表明,房颤是缺血性卒中最重要的可干预病因之一,一般需根据卒中风险评分决定是否抗凝。
In atrial fibrillation the atria stop contracting effectively, so blood stagnates—particularly in the left atrial appendage—and can form thrombi. Embolized clots traveling to the cerebral arteries cause cardioembolic stroke. Evidence identifies AF as a leading preventable cause of ischemic stroke, and anticoagulation is typically guided by stroke-risk scoring.
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。

中华医学会心电生理和起搏分会等,《心房颤动诊断和治疗中国指南(2023)》,中华心血管病杂志2023;51(9):904-972

Chinese Society of Pacing and Electrophysiology, et al. Chinese Guidelines for Diagnosis and Treatment of Atrial Fibrillation, 2023. Chin J Cardiol. 2023;51(9):904-972

#房颤 #脑卒中 #抗凝

慢性心力衰竭按左心室射血分数可分为哪些类型?

How is chronic heart failure classified by left ventricular ejection fraction?

慢性心衰主要分为射血分数降低的心衰(HFrEF,LVEF≤40%)、射血分数保留的心衰(HFpEF,LVEF≥50%)以及中间范围(HFmrEF,41%–49%)。不同类型在病理机制和药物治疗选择上存在差异。一般需经超声心动图评估后再确定个体化的治疗策略。
Chronic heart failure is mainly divided into heart failure with reduced ejection fraction (HFrEF, LVEF ≤40%), preserved ejection fraction (HFpEF, LVEF ≥50%), and mid-range ejection fraction (HFmrEF, 41%–49%). The types differ in mechanism and pharmacotherapy. Echocardiography guides the individualized treatment plan.
难度 进阶 · 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《中国心力衰竭诊断和治疗指南(2018)》

Chinese Medical Association. Chinese Guidelines for Diagnosis and Treatment of Heart Failure, 2018

#心力衰竭 #射血分数 #分型

冠心病的主要可干预危险因素有哪些?

What are the main modifiable risk factors for coronary heart disease?

冠心病的主要可干预危险因素包括高血压、血脂异常(尤其低密度脂蛋白胆固醇升高)、吸烟、糖尿病和肥胖。研究表明,控制这些危险因素可显著降低动脉粥样硬化性心血管病的发病风险。一般建议通过生活方式干预与必要时的药物治疗进行综合管理。
The main modifiable risk factors for coronary heart disease are hypertension, dyslipidemia (especially elevated LDL cholesterol), smoking, diabetes, and obesity. Studies show that controlling these factors substantially lowers the risk of atherosclerotic cardiovascular disease. Lifestyle change combined with drug therapy when needed is the usual approach.
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。

中华医学会心血管病学分会《中国心血管病预防指南(2017)》

Chinese Society of Cardiology. Guidelines for Cardiovascular Disease Prevention in China, 2017

#冠心病 #危险因素 #动脉粥样硬化