ADVENT HEALTH EKG FINAL EXAM
STUDY GUIDE QUESTIONS AND
ANSWERS
1. Which anatomical structure is considered the primary pacemaker of the heart, typically
firing at a rate of 60-100 beats per minute?
A. AV Node
B. Bundle of His
C. SA Node
D. Purkinje Fibers
Answer: C
Conceptual Explanation: The Sinoatrial (SA) node is the heart’s natural pacemaker,
initiating the electrical impulse for each heartbeat under normal conditions.
2. On a standard EKG grid, what is the duration represented by one small square (1mm)?
A. 0.04 seconds
B. 0.10 seconds
C. 0.20 seconds
,D. 0.50 seconds
Answer: A
Conceptual Explanation: Standard EKG paper moves at 25mm/sec; therefore, each 1mm
small box represents 0.04 seconds.
3. What does the P wave represent on an EKG tracing?
A. Ventricular Depolarization
B. Atrial Repolarization
C. Atrial Depolarization
D. Ventricular Repolarization
Answer: C
Conceptual Explanation: The P wave represents the electrical activation (depolarization)
of the atria.
4. A PR interval is considered prolonged if it measures greater than:
A. 0.12 seconds
B. 0.16 seconds
C. 0.20 seconds
D. 0.24 seconds
Answer: C
, Conceptual Explanation: A normal PR interval ranges from 0.12 to 0.20 seconds. Anything
over 0.20 seconds indicates a first-degree AV block.
5. The QRS complex represents which cardiac event?
A. Atrial Depolarization
B. AV Node Delay
C. Ventricular Repolarization
D. Ventricular Depolarization
Answer: D
Conceptual Explanation: The QRS complex represents the electrical activation and
subsequent contraction of the ventricles.
6. What is the normal duration of a QRS complex?
A. 0.12 - 0.20 seconds
B. 0.06 - 0.10 seconds
C. Less than 0.04 seconds
D. Greater than 0.12 seconds
Answer: B
Conceptual Explanation: A normal QRS complex is narrow, typically measuring between
0.06 and 0.10 seconds. 0.12 or greater is considered wide.
STUDY GUIDE QUESTIONS AND
ANSWERS
1. Which anatomical structure is considered the primary pacemaker of the heart, typically
firing at a rate of 60-100 beats per minute?
A. AV Node
B. Bundle of His
C. SA Node
D. Purkinje Fibers
Answer: C
Conceptual Explanation: The Sinoatrial (SA) node is the heart’s natural pacemaker,
initiating the electrical impulse for each heartbeat under normal conditions.
2. On a standard EKG grid, what is the duration represented by one small square (1mm)?
A. 0.04 seconds
B. 0.10 seconds
C. 0.20 seconds
,D. 0.50 seconds
Answer: A
Conceptual Explanation: Standard EKG paper moves at 25mm/sec; therefore, each 1mm
small box represents 0.04 seconds.
3. What does the P wave represent on an EKG tracing?
A. Ventricular Depolarization
B. Atrial Repolarization
C. Atrial Depolarization
D. Ventricular Repolarization
Answer: C
Conceptual Explanation: The P wave represents the electrical activation (depolarization)
of the atria.
4. A PR interval is considered prolonged if it measures greater than:
A. 0.12 seconds
B. 0.16 seconds
C. 0.20 seconds
D. 0.24 seconds
Answer: C
, Conceptual Explanation: A normal PR interval ranges from 0.12 to 0.20 seconds. Anything
over 0.20 seconds indicates a first-degree AV block.
5. The QRS complex represents which cardiac event?
A. Atrial Depolarization
B. AV Node Delay
C. Ventricular Repolarization
D. Ventricular Depolarization
Answer: D
Conceptual Explanation: The QRS complex represents the electrical activation and
subsequent contraction of the ventricles.
6. What is the normal duration of a QRS complex?
A. 0.12 - 0.20 seconds
B. 0.06 - 0.10 seconds
C. Less than 0.04 seconds
D. Greater than 0.12 seconds
Answer: B
Conceptual Explanation: A normal QRS complex is narrow, typically measuring between
0.06 and 0.10 seconds. 0.12 or greater is considered wide.
