ECG Quiz

ECG Quiz

Left bundle branch block (LBBB)
Left bundle branch block (LBBB)

Features of left bundle branch block (LBBB) are evident. The QRS is widened, measuring around 160 milliseconds (4 mm). M shaped pattern is seen in lateral leads (lead I, V5 and V6). Broad negative complexes are seen in V1, V2 and V3. ST depression and T wave inversion are noted in the lateral leads I, aVL, V5 and V6. S waves are very deep in leads V1 to V4. An R wave in V1 and upright T wave in V5 may be a subtle evidence of underlying coronary artery disease. There is also left axis deviation.

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