ECG Physiology — Cardiovascular Physiology

ECG Physiology MCQs: practice questions

Sample ECG Physiology multiple-choice questions from Cardiovascular Physiology.

1. The T wave represents:

   • A. Ventricular depolarization
   • B. Atrial depolarization
   • C. Atrial systole
   • D. Ventricular repolarization
   • E. AV nodal conduction

2. If ventricular depolarization is directed toward a positive electrode, the ECG deflection is generally:

   • A. Positive
   • B. Negative
   • C. Always isoelectric
   • D. Absent
   • E. Random

3. A longer QT interval generally indicates:

   • A. Only atrial enlargement
   • B. Shorter ventricular electrical activity
   • C. Prolonged ventricular depolarization-repolarization
   • D. Faster AV conduction
   • E. Absent ventricular activity

4. The PR interval is measured from:

   • A. End of P to end of T
   • B. Beginning of P to beginning of Q
   • C. Beginning of Q to end of T
   • D. End of Q to beginning of T
   • E. Beginning of T to end of P

5. The electrical event that follows the P wave is:

   • A. U wave necessarily
   • B. T wave
   • C. Second heart sound
   • D. Dicrotic notch
   • E. QRS complex

6. The impulse normally travels from the atria to the ventricles through the:

7. The ECG records:

8. The ST segment is normally:

9. Ventricular depolarization normally precedes:

10. The normal sequence of cardiac electrical activation begins in the:

11. The P wave represents:

12. Ventricular repolarization occurs during the:

13. A prolonged PR interval indicates delayed conduction through the:

14. If ventricular depolarization moves away from a positive electrode, the ECG deflection is generally:

15. Ventricular depolarization begins during the:

16. The QRS complex normally obscures:

17. The isoelectric period when the entire ventricle is depolarized is the:

18. Atrial depolarization normally precedes:

19. Lead II of the ECG records electrical activity along an axis that is generally:

20. The QRS complex represents:

21. The cardiac electrical axis is determined by the direction of:

22. The QT interval represents:

23. A pattern of two P waves before each QRS suggests:

24. Atrial repolarization is usually hidden within the:

25. The ST segment corresponds mechanically to:

26. The T wave begins after:

27. The ECG is an electrical marker for the:

28. The His-Purkinje system distributes excitation primarily through the:

29. The QRS complex is larger than the P wave primarily because:

30. Atrial depolarization occurs during the: