肾病综合征患者血清白蛋白显著降低时,其水肿形成的核心病理生理机制是什么?
What is the core pathophysiologic mechanism of edema formation in nephrotic syndrome with markedly reduced serum albumin?
大量尿蛋白丢失使肝脏白蛋白合成不足以代偿,血浆胶体渗透压下降,液体自血管内向组织间隙转移,形成低血容量状态。这激活肾素-血管紧张素-醛固酮系统并促进抗利尿激素分泌,引起水钠潴留进一步加重水肿,即经典充盈不足学说。近年研究还发现肾小管上皮细胞对滤过蛋白的水解可促进钠重吸收,即过度充盈机制也参与其中。
Massive urinary protein loss outstrips hepatic albumin synthesis, lowering plasma oncotic pressure so fluid shifts from the intravascular to the interstitial compartment, producing hypovolemia. This activates the renin-angiotensin-aldosterone system and vasopressin secretion, causing renal sodium and water retention that aggravates edema, known as the classic underfill mechanism. Recent evidence also supports an overfill component driven by tubular proteolysis of filtered protein that enhances sodium reabsorption.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
中华医学会肾脏病学分会《肾病综合征诊疗规范》;内科学第9版第五篇第三章 ; 另见: KDIGO Clinical Practice Guideline for Glomerular Diseases (2021); Brenner & Rector's The Kidney, 11th ed.
KDIGO Clinical Practice Guideline for Glomerular Diseases (2021); Brenner & Rector's The Kidney, 11th ed. ; see also: 中华医学会肾脏病学分会《肾病综合征诊疗规范》;内科学第9版第五篇第三章
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL16639189W：Brenner & Rector's the
#肾脏病学 #肾病综合征
IgA 肾病的牛津分型(MEST-C)包含哪五项病理指标?其中哪些对预后判断和治疗选择最有指导意义?
Which five pathological variables form the Oxford MEST-C classification of IgA nephropathy, and which ones guide prognosis and treatment decisions most?
MEST-C 五项指标为系膜细胞增多(M)、毛细血管内增生(E)、节段性硬化(S)、小管萎缩/间质纤维化(T)和新月体(C)。T 病变是肾功能下降最强的独立预测因子,T2 患者预后最差;E 病变提示患者对糖皮质激素治疗的获益更明显。KDIGO 2021 指南主张将蛋白尿水平与 MEST-C 评分相结合,决定支持治疗与免疫抑制的强度。
MEST-C comprises mesangial hypercellularity (M), endocapillary hypercellularity (E), segmental sclerosis (S), tubular atrophy/interstitial fibrosis (T), and crescents (C). The T score is the strongest independent predictor of renal function decline, with T2 carrying the worst prognosis, while endocapillary hypercellularity flags patients who gain most from glucocorticoid therapy. KDIGO 2021 recommends weighing proteinuria against the MEST-C score when calibrating supportive care and immunosuppression.
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：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
KDIGO肾小球疾病临床实践指南,Kidney Int 2021;100(4S):S1-S32;牛津分型原始研究,Cattran DC 等,Kidney Int 2009;76:468-481
KDIGO Clinical Practice Guideline for Glomerular Diseases, Kidney Int 2021;100(4S):S1-S32; Oxford classification original cohort, Cattran DC et al., Kidney Int 2009;76:468-481
#肾脏病 #IgA肾病
评估慢性肾脏病严重程度的核心指标是什么？临床上如何进行分期？
Which measure is central to assessing the severity of chronic kidney disease, and how is it staged clinically?
核心指标是肾小球滤过率（GFR），通常以血肌酐结合年龄、性别经CKD-EPI等公式估算。KDIGO分期将其分为G1至G5期：G1≥90，G2为60~89，G3a为45~59，G3b为30~44，G4为15~29，G5低于15 ml/min/1.73m²。异常须持续超过3个月方能确诊，并联合白蛋白尿A1~A3分级共同判断进展风险。
The central measure is the glomerular filtration rate (GFR), typically estimated from serum creatinine together with age and sex using equations such as CKD-EPI. The KDIGO system assigns categories G1 through G5: G1 at or above 90, G2 60-89, G3a 45-59, G3b 30-44, G4 15-29, and G5 below 15 ml/min/1.73 m2. Abnormalities must persist for more than three months before the diagnosis stands, and albuminuria grades A1-A3 are combined with the GFR category to gauge progression risk.
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：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
KDIGO慢性肾脏病评估与管理临床实践指南（2024），Kidney International
KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of CKD, Kidney International
#慢性肾脏病 #肾功能分期
肾脏每天过滤约180升血液滤液,为什么最后只排出1–2升尿?
The kidneys filter about 180 liters of plasma a day — why do we pass only one to two liters of urine?
因为滤过只是第一步,99%的液体随后被肾小管重吸收。关键装置是髓质的逆流倍增系统:髓袢降支允许水出去、升支主动把盐泵进高渗的组织间隙却不透水,形成由皮质向髓质逐渐升高的渗透梯度;集合管再在抗利尿激素指挥下决定放多少水回血液。饮水少时激素升高、梯度全开,尿被浓缩到接近血浆渗透压的四倍;大量喝水则激素撤除,排出稀释尿。这套机制让人类既能保水又能排废,是哺乳动物登陆成功的幕后功臣之一。
Because filtration is only step one: ninety-nine percent of the filtrate is reabsorbed by the tubules. The key device is the countercurrent multiplier of the medulla — the descending limb lets water leave while the thick ascending limb pumps salt into the interstitium without water, building an osmotic gradient rising from cortex to papilla; the collecting duct then decides how much water to reclaim under antidiuretic hormone. When dehydrated, hormone rises and full concentration approaches four times plasma osmolality; drink plenty and the hormone withdraws for dilute urine. This system lets mammals conserve water while dumping waste — quiet groundwork for life on land.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Boron 与 Boulpaep,《Medical Physiology》第3版,Elsevier,2017
W. F. Boron and E. L. Boulpaep, Medical Physiology, 3rd ed., Elsevier, 2017
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-1-4557-4377-3 (3rd ed., Elsevier)
#肾脏 #逆流倍增 #抗利尿激素