Question?問題：

Orthodromic AV reentrant tachycardia accounts for 95% of reentrant tachycardias in WPW patients, caused by anterograde conduction via the AV node with retrograde conduction via the accessory pathway. What are ECG signs suggesting orthodromic AVRT??

順向性房室折返心動(dòng)過速（AVRT）占預(yù)激綜合征（WPW）患者折返性心動(dòng)過速的95%，其機(jī)制是房室結(jié)（AV）前向傳導(dǎo)然后通過旁路逆向傳導(dǎo)。什么心電圖表現(xiàn)提示順向性AVRT？

Answer?答案：

While EP studies are needed to definitively distinguish AVRT from AVNRT, ECG markers indicating orthodromic AVRT are a heart rate 200 – 300 bpm, QRS duration < 120 ms, ST depressions, T wAVe inversions, and retrograde P wAVes。?

雖然明確區(qū)分房室折返心動(dòng)過速（AVRT）和房室結(jié)折返心動(dòng)過速（AVNRT）需要電生理檢查，心電圖提示AVRT的指標(biāo)包括心率在200 – 300，QRS時(shí)間<120毫秒，ST壓低，T波倒置，和逆向P波。

參考文獻(xiàn)：

Cureus.2020;12:e8971