肺动脉瓣关闭不全
肺动脉瓣功能不全导致舒张期血液从肺动脉干病理性反流至右心室。
定义
肺动脉瓣关闭不全,其特征为舒张期血液从肺动脉干逆向反流进入右心室,继发于先天性病因(瓣膜切开术后、法洛四联症根治术后)、特发性瓣环扩张或心内膜炎,在无严重肺动脉高压的情况下引起进行性右心室容量负荷过重 [C4] [C5] [V3] [G23-03]。
严重程度标准
- 轻度(L):起源处反流束宽度 < 右室流出道(RVOT)的 25 %;缩流颈(VC)无法测出或极窄;压力半降时间(PHT)> 100 ms;多普勒减速斜率缓慢;反流分数(RF)< 20 % [V3] [G23-03]。
- 中度(M):反流束宽度为RVOT的 25–50 %;中等VC;PHT 100–100 ms;RF 20–39 % [V3] [G23-03]。
- 重度(G):反流束宽度 > RVOT的 50 %;增宽VC;压力半降时间(PHT)< 100 ms;陡峭舒张期减速斜率伴舒张期血流提前终止(舒张末期前PA-RV压力均等);肺动脉分支中出现全舒张期逆向血流;心脏MRI定量反流分数 ≥ 35–40 %(或按经典标准RF ≥ 50 %)[V3] [C5] [G23-03] [C4]。
分层表现
模拟器严重程度分级
模拟器严重程度分级:
轻度, 中度, 重度
基线心律:
正常窦性心律
亦称为: 肺动脉瓣关闭不全 · 肺动脉瓣反流 · 肺动脉瓣口关闭不全 · 肺动脉反流 · PR
该组中的其他病变
文献来源
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