This echocardiography clip is showing an abnormal motion of Interventricular septum (IVS) in a patient with LBBB in Apical four chamber view (A4CH). In a majority of patients with left bundle-branch block (LBBB), there is abnormal leftward motion of the interventricular septum during the pre-ejection phase. This motion was considered to be passive, caused by early rise in right ventricular (RV) pressure.
Brugada ECG vs Incomplete Right Bundle Branch Block (iRBBB) Why this differentiation matters Brugada pattern is a malignant channelopathy associated with sudden cardiac death, while incomplete RBBB is usually a benign conduction variant. Mislabeling Brugada as iRBBB can be fatal; overcalling iRBBB as Brugada can lead to unnecessary anxiety and ICD implantation. --- 1. Basic Definitions Brugada ECG Pattern Primary repolarization abnormality Genetic sodium-channel disorder Characteristic ST-segment elevation in V1–V3 Risk of ventricular fibrillation and sudden death Incomplete RBBB (iRBBB) Depolarization abnormality Delay in right ventricular conduction Common in healthy individuals Usually asymptomatic and benign --- 2. ECG Morphology: Side-by-Side Comparison QRS Duration Brugada: QRS usually <120 ms iRBBB: QRS <120 ms, but with RBBB morphology --- V1–V2 Pattern (Key Differentiator) Brugada Pseudo-RBBB appearance ST elevation ≥2 mm ST segment is coved or saddleback Terminal QRS bl...
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