Case 23 — Electrocardiogram

ECG with three simultaneous leads (I, II, III) at 25 mm/sec, 1 cm = 1 mV. Irregularly irregular rhythm consistent with atrial fibrillation. Splintered QRS complexes.
Three simultaneous leads (I, II, III) at 25 mm/s, 1 cm = 1 mV.

Quiz

1. What is the average heart rate?

2. The ninth complex is the slowest. What is the approximate heart rate at that instant in time?

3. The complex that is third from the end is the fastest, coming only about 7 mm after the previous complex. What is the approximate heart rate at that instant in time?

4. What is the rhythm?

5. The QRS complexes are splintered. This is most commonly seen in association with what abnormality?

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