主动脉瓣狭窄与 Lp(a) 的关联
先认识主动脉瓣
主动脉瓣(aortic valve)是心脏四个瓣膜(heart valve,Heart valve心脏瓣膜 · Heart valve/hɑːrt vælv/心脏内像单向门一样的结构,共四个(三尖瓣、二尖瓣、肺动脉瓣、主动脉瓣),确保血液只朝一个方向流动、不倒流。One of the four one-way, door-like structures in the heart (tricuspid, mitral, pulmonary, aortic valve) that keep blood flowing in a single forward direction and prevent backflow.🧩 词根拆解 / word rootsvalve瓣、活门(原指门扇) · leaf of a folding door拉丁语 valva 门扇)之一, 位于左心室(left ventricle,Ventricle心室 · Ventricle/ˈvɛntrɪkəl/心脏下部的两个泵血腔室(左心室、右心室);右心室把血泵向肺,左心室把血泵向全身,是心脏主要的“动力泵”。Either of the two lower pumping chambers of the heart (left and right ventricle); the right ventricle pumps blood to the lungs and the left ventricle pumps blood to the whole body.🧩 词根拆解 / word rootsventr-腹、腔 · belly/cavity拉丁语 venter 腹+-icle小(指小词后缀) · diminutive: little)与主动脉(aorta,Aorta主动脉 · Aorta/eɪˈɔːrtə/人体最大的动脉,从左心室发出,是体循环的“主干”;它逐级分支成越来越小的动脉,把富氧血送往全身。The body's largest artery, arising from the left ventricle; it is the 'trunk' of the systemic circulation, branching into progressively smaller arteries that carry oxygen-rich blood throughout the body.🧩 词根拆解 / word rootsaort-主动脉 · aorta希腊语 aortē 悬挂之物(指大血管)+-a名词词尾 · noun ending) 之间。心脏每跳动一次,它就打开、让左心室把血射入主动脉,随即关闭、防止血液倒流。
主动脉瓣狭窄(aortic (valve) stenosis,AS主动脉瓣狭窄 · Aortic (valve) stenosisAS/eɪˈɔːrtɪk stəˈnoʊsɪs/主动脉瓣开口变窄、阻碍左心室向主动脉射血的瓣膜病;高 Lp(a) 是其独立危险因素之一。A valvular disease in which the aortic valve opening narrows, obstructing blood ejection from the left ventricle into the aorta; high Lp(a) is one independent risk factor.🧩 词根拆解 / word rootsaort-主动脉 · aorta希腊语 aortē+-ic…的(形容词后缀) · adjective suffix+steno-狭窄 · narrow希腊语 stenos 窄+-osis(病理性)状态、过程 · abnormal condition/process希腊语 -ōsis,常缩写 AS)指的 是这个瓣口变窄、阻碍左心室向主动脉射血——医学上称为"左心室流出道梗阻"。[1]Tier 3StatPearls Publishing et al. Aortic Stenosis. 2023https://www.ncbi.nlm.nih.gov/books/NBK557628/
瓣膜为什么会变窄:钙化
在中老年人群中,主动脉瓣狭窄最常见的原因是瓣膜随年龄发生钙化(calcification, Calcification钙化 · Calcification/ˌkælsɪfɪˈkeɪʃən/钙盐(主要为磷酸钙)在软组织中异常沉积、使其变硬的过程;当发生在心脏瓣膜或动脉壁时,会损害它们的正常功能。它是一种主动的、类似成骨的病变,而非单纯“缺钙/补钙”问题。The abnormal deposition of calcium salts (mainly calcium phosphate) in soft tissue, causing it to harden; when it occurs in heart valves or arterial walls it impairs their normal function. It is an active, bone-like process rather than a simple matter of dietary calcium.🧩 词根拆解 / word rootscalc-钙、石灰 · calcium/lime拉丁语 calx 石灰+-fication使…形成(的过程) · process of making into)——钙盐逐渐沉积在瓣叶里,使原本柔软的瓣膜变硬、增厚,这一过程称为 主动脉瓣钙化(aortic valve calcification,AVC主动脉瓣钙化 · Aortic valve calcificationAVC/eɪˈɔːrtɪk vælv ˌkælsɪfɪˈkeɪʃən/钙盐在主动脉瓣叶内逐渐沉积、使原本柔软的瓣膜变硬、增厚的病理过程;是中老年人主动脉瓣狭窄最常见的原因,也是高 Lp(a) 所促发的关键环节。The pathological deposition of calcium in the aortic valve leaflets that progressively stiffens and thickens the normally supple valve; the most common cause of aortic stenosis in older adults and a key process promoted by high Lp(a).🧩 词根拆解 / word rootsaort-主动脉 · aorta希腊语 aortē+valve瓣、活门 · valve拉丁语 valva 门扇+calc-钙、石灰 · calcium/lime拉丁语 calx 石灰+-fication使…形成(的过程) · process of making into)。 StatPearls 指出,这种钙化性主动脉瓣硬化在 65 岁以上人群中的患病率约为 29%,远高于 65 岁及以下 人群(约 1%–2%)。[1]Tier 3StatPearls Publishing et al. Aortic Stenosis. 2023https://www.ncbi.nlm.nih.gov/books/NBK557628/
要留意:这里的"钙化"是瓣膜本身的一种主动的、类似成骨的病变,而不是简单的"钙吃多了"或"缺钙 补钙"的问题。