1️⃣ Left Bundle Branch Block (LBBB) • ECG: Wide QRS complex (>120 ms), broad or notched R wave in leads I, V5–V6 • Echo effect: • The interventricular septum contracts early • The left ventricular free wall contracts late • Result: Jerky or paradoxical septal motion • 👉 Most common cause ⸻ 2️⃣ Right ventricular pacing (pacemaker rhythm) • ECG: Pacing spikes with an LBBB-like QRS morphology • Echo: • Abnormal electrical activation leading to septal dyssynchrony • Jerky septal motion is commonly
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1️⃣ Left Bundle Branch Block (LBBB) • ECG: Wide QRS complex (>120 ms), broad or notched R wave in leads I, V5–V6 • Echo effect: • The interventricular septum contracts early • The left ventricular free wall contracts late • Result: Jerky or paradoxical septal motion • 👉 Most common cause ⸻ 2️⃣ Right ventricular pacing (pacemaker rhythm) • ECG: Pacing spikes with an LBBB-like QRS morphology • Echo: • Abnormal electrical activation leading to septal dyssynchrony • Jerky septal motion is commonly
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