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学习笔记 | 主动脉瓣狭窄超声规范化检查

  • 2026-05-04 10:14:06
学习笔记 | 主动脉瓣狭窄超声规范化检查

🕊how time flies🕊
距离上一次更新成人心脏瓣膜病
的心超规范化检查已经一年半了
👉学习笔记 | 主动脉瓣反流
马上进入今天的学习⬇️

主动脉瓣狭窄

超声心动图规范化检查速查

常见病因
  • 先天性(如二叶式主动脉瓣)

  • 风湿性

  • 老年退行性(钙化性)——我国最常见

核心测量参数
  1. 主动脉瓣峰值流速🔴

    1. 检查部位以心尖三腔心和五腔心切面为优

  2. 平均跨瓣压差🔴

    1. 获取清晰主动脉瓣连续多普勒频谱(CW)

    2. 描记频谱轮廓外缘

      1. 不同厂家的操作步骤不太一样,但都在计算程序包里面可以找到。

      2. 通常用“描记”或“Trace”功能。

      3. 比如飞利浦在计算程序包的“左心”-“主动脉”-“AV速度时间积分”;GE在measure-AV-VTI-trace(型号不同,目录位置也不太一样!)

    3. 读取仪器自动计算的 “Mean Grad” 或 “PG mean” 即为平均跨瓣压差。

        1. 有效瓣口面积🔴

          1. 测量LVOT直径

            1. 放大模式下收缩中期测量

            2. 瓣环水平(下图中测量线a所指)或距瓣环 0.3~1.0 cm处(下图中测量线b所指)

            3. 测量范围:室间隔侧内缘→二尖瓣前叶内缘

          2. 测量VTILVOT :脉冲多普勒(PW)定位测量,取样容积长度为 3~5 mm,置于主动脉瓣左心室侧接近血流加速区。(注意❗️这里是用PW

          3. 测量VTIAV :获取方法同前

          4. 公式:连续方程法 AVA(cm2)=(ALVOT ×VTILVOT )/VTIAV

            1. 公式看起来复杂但是不要被吓到

            2. 只要按照前述abc三个步骤测出LVOT直径、VTILVOT、VTIAV,机器就会自动测算出主动脉瓣口面积。(前提是都要用计算程序包记录数据,不然就只能手动计算了)

            3. 最后可能会得到AVA(VTI)、AVA(Vmax)两个数值,选AVA(VTI)

              (这正是共识的表格里“平均跨瓣压差”所列举的两种不同计算逻辑。其实我们只进行了一次操作,但机器根据描记的波形用了峰值速度速度时间积分两种不同的推导方式。只要记住推荐使用VTI就可以了)

        2. 速度比值🔵

          1. LVOT流速/主动脉瓣峰值流速,变异度更小

        狭窄程度分级标准
        项目
        轻度
        中度
        重度
        峰值流速(m/s)
        2.6~2.9
        3.0~4.0
        ≥4.0
        平均跨瓣压差(mmHg)
        <20
        20~40
        ≥40
        主动脉瓣口面积(cm²)
        >1.5
        1.0~1.5
        <1.0
        瓣口面积指数(cm²/m²)
        >0.85
        0.60~0.85
        <0.60
        速度比值
        >0.50
        0.25~0.50
        <0.25
        *①主动脉瓣口面积<1.0 cm2、②峰值流速≥4.0 m/s、③主动脉瓣平均跨瓣压差≥40 mmHg,以上三项中任一项达标即提示重度主动脉瓣狭窄
        *峰值流速和平均跨瓣压差更为简便易行。
        *连续方程法的变量较多,没有经验的新手在测量LVOT直径和左室流出道流速的时候会有误差,导致最后得出的有效瓣口面积误差较大。
        *但上述这一点可以通过医师的不断训练和重复测量得到矫正。连续方程法在临床实践中总体还是比较稳定可靠。
        *理想情况下,应严格符合范围内的所有标准,但诊断标准不一致时需综合判断,即需要排除以下特殊情况。
        特殊情况

        1. 高压差AS

        • 峰值≥4.0 m/s、平均压差≥40 mmHg,但AVA可能≥1.0 cm²

        • 需排除:发热、贫血、甲亢、动静脉瘘等高排血量状态

        2. 射血分数降低的低血流、低压差AS(LVEF<50%,SVI<35 ml/m²)

        • 小剂量多巴酚丁胺负荷试验

        • 若峰值≥4.0 m/s或平均压差≥30~40 mmHg → 真性重度AS

        3. 射血分数保留的低血流、低压差AS(LVEF≥50%)

        • 需排除:测量误差(尤其低估LVOT面积)、高血压

        • 体型小者:AVA<1.0 cm²可能仅为中度狭窄

        4. 正常血流、低压差AS

        • 不应诊断为重度AS,需密切随访

        随访

        影响手术决策的超声发现:

        • 峰值流速 >5.5 m/s

        • 重度钙化 + 峰值流速每年递增 ≥0.3 m/s

        • 运动负荷试验:平均压差增加 >20 mmHg

        主动脉狭窄评估流程
        *新手tips:
        刚开始独立上机的时候,一遇到异常就想请会诊,这是正常的心理阶段。
        但是要克服这个过程。
        先自己琢磨着把能测的数据都测了,再请会诊,并且主动汇报自己的发现和疑惑的点,然后看看上级医师的结论和自己初诊有什么不同。对比差距才会进步。
        心脏彩超涉及比较多的血流动力学测量,其实并不是你不会做,可能只是不知道机器按键如何操作。通过主动查阅使用说明书就会发现:哦,不过如此
        无他,但手熟尔

        References:

        [1]  中华医学会心血管病学分会心血管影像学组. 中国成人心脏瓣膜病超声心动图规范化检查专家共识. 中国循环杂志, 2021, 36(2): 109-125.

        点亮 ❤,一起提升超声诊断能力!👇

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        1. CONNECT:[ UseTime:0.001112s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
        2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001621s ]
        3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002209s ]
        4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000712s ]
        5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001322s ]
        6. SELECT * FROM `set` [ RunTime:0.000627s ]
        7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001447s ]
        8. SELECT * FROM `article` WHERE `id` = 485936 LIMIT 1 [ RunTime:0.006743s ]
        9. UPDATE `article` SET `lasttime` = 1777865276 WHERE `id` = 485936 [ RunTime:0.028320s ]
        10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000624s ]
        11. SELECT * FROM `article` WHERE `id` < 485936 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001273s ]
        12. SELECT * FROM `article` WHERE `id` > 485936 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001317s ]
        13. SELECT * FROM `article` WHERE `id` < 485936 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001899s ]
        14. SELECT * FROM `article` WHERE `id` < 485936 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003510s ]
        15. SELECT * FROM `article` WHERE `id` < 485936 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012490s ]
        0.242298s