Case 9 — Electrocardiogram

Six-limb-lead ECG recorded from Bingo at rest with a lead II rhythm strip along the bottom. Paper speed is 50 mm/second. QRS complexes are approximately 0.4 seconds apart (heart rate ~150 bpm). On the rhythm strip, the sixth and eighth complexes are premature, have negative P waves in front of them, and have normal-appearing QRS complexes.
Six-limb-lead ECG with lead II rhythm strip (50 mm/s). Heart rate ~150 bpm. The 6th and 8th complexes on the rhythm strip are premature with negative P waves and normal QRS morphology.

Quiz

1. What type of premature complexes are present?

2. Which one of the following sites cannot be the source of the premature complexes?

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