Cardiology Quiz #31: Atrioventricular Blocks

1. A 68-year-old man presents with episodes of dizziness and fatigue. An ECG reveals a constant PR interval longer than 200 ms, but all atrial impulses are conducted to the ventricles. Which of the following is the most likely diagnosis? 

Question 1 of 5

2. A 55-year-old woman with a history of heart disease presents with palpitations and lightheadedness. Her ECG shows progressively lengthening PR intervals until a QRS complex is dropped, after which the cycle repeats. What is the most likely diagnosis? 

Question 2 of 5

3. During a routine check-up, a 72-year-old man's ECG shows no relation between P waves and QRS complexes; atrial and ventricular rhythms are regular but independent of each other. What is the most likely diagnosis? 

Question 3 of 5

4. A 63-year-old man presents to the emergency department with chest pain. His ECG shows regular atrial and ventricular rhythms, but with some P waves not followed by QRS complexes, and the PR intervals of conducted beats do not show progressive lengthening. Which of the following is the most likely diagnosis? 

Question 4 of 5

5. A patient's ECG shows a PR interval that varies with no discernible pattern, occasional dropped beats, and more P waves than QRS complexes. Which of the following conditions is most consistent with these findings? 

Question 5 of 5


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