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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ECG Tip: LBBB vs. RBBB Made Easy! 🫀 👉 But what are these blocks? A bundle branch block happens when the electrical signals traveling through the heart’s bundle branches (which control the ventricles) are slowed or blocked. This delay can affect how the ventricles contract, leading to the characteristic wide QRS complexes seen on an ECG. Causes can include structural heart changes, ischemia, hypertension, or scarring from prior heart conditions. 👉 Want to learn more? Watch our latest YouTube v
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