Case 15 — ECG

Lead II ECG at 25 mm/sec, calibration 1 cm = 1 mV. QRS complexes are approximately 5 mm apart, corresponding to a heart rate of about 300 beats per minute. The complexes are narrow and normal in appearance, consistent with a supraventricular origin.
Lead II (25 mm/s, 1 cm = 1 mV). Heart rate ~300 bpm with narrow, normal-appearing QRS complexes.

Quiz

1. What is the heart rate?

2. What is the rhythm disturbance?

3. This is a medical emergency due to critically low cardiac output from inadequate ventricular filling. Which of the following would be ineffective?

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