ECG Weekly

Weekly Workout · #582 · February 23, 2026

Preexcitation Pitfalls (Part 3): Wide, Irregular, Fast...Avoid AV Nodal Blockers

HPI

A 53-year-old man presents with palpitations and lightheadedness. The following ECG is obtained on arrival and appears very rapid and irregular with changing QRS morphologies. He starts showing signs of instability shortly after arrival.

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