KROK 1 2021 – Question 130 · KROK (Medicine) · Physiology
A patient has cardiac rhythm disturbance. ECG shows heart rate of 60/min., prolongation of PQ interval, and periodical loss of QRS complex. What cardiac rhythm disturbance is it?
- A. First-degree incomplete AV block
- B. His’ right bundle branch block
- C. Complete AV block
- D. Sick sinus syndrome
- E. Second-degree incomplete AV block
Hint
Look at conduction through the AV node: the PQ interval is stretched, yet only some beats fail to pass, producing intermittently missing ventricular complexes.
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