EKG CLEP FINAL EXAM QUESTIONS
WITH VERIFIED ANSWERS.NEW
UPDATE. JUST RELEASED
1. Where is the Sinoatrial (SA) node located in the heart?
A. Lower portion of the left atrium
B. Interventricular septum
C. Upper portion of the right atrium
D. Apex of the left ventricle
Answer: C
Conceptual Explanation: The SA node, the primary pacemaker of the heart, is located in
the upper posterior wall of the right atrium.
2. A PR interval is considered prolonged if it exceeds how many seconds?
A. 0.12 seconds
B. 0.16 seconds
C. 0.24 seconds
D. 0.20 seconds
Answer: D
,Conceptual Explanation: A normal PR interval is between 0.12 and 0.20 seconds.
Anything over 0.20 seconds indicates a first-degree AV block.
3. Which EKG lead is primarily used to view the septal wall of the heart?
A. Lead II
B. Lead aVL
C. Lead V5 and V6
D. Lead V1 and V2
Answer: D
Conceptual Explanation: Precordial leads V1 and V2 are positioned to provide the best
view of the interventricular septum.
4. What is the hallmark characteristic of a Mobitz Type I (Wenckebach) second-degree AV
block?
A. Constant PR intervals followed by a dropped QRS
B. Complete dissociation between P waves and QRS complexes
C. Progressive lengthening of the PR interval until a QRS is dropped
D. A PR interval longer than 0.20 seconds that remains constant
Answer: C
Conceptual Explanation: Wenckebach is characterized by a ‘longer, longer, longer, drop’
pattern of the PR interval.
, 5. A wide QRS complex (greater than 0.12s) most likely indicates which of the following?
A. Atrial depolarization delay
B. Normal ventricular conduction
C. Ventricular conduction delay or Bundle Branch Block
D. Accelerated AV node conduction
Answer: C
Conceptual Explanation: A wide QRS indicates that the impulse is taking longer to travel
through the ventricles, often due to a block in the bundle branches.
6. In a 12-lead EKG, which leads look at the inferior wall of the left ventricle?
A. I, aVL, V5, V6
B. II, III, aVF
C. V1, V2, V3, V4
D. aVR, V1
Answer: B
Conceptual Explanation: Leads II, III, and aVF view the inferior portion of the heart, which
is supplied by the Right Coronary Artery.
7. What rhythm is characterized by a ‘sawtooth’ pattern of P waves?
A. Atrial Fibrillation
WITH VERIFIED ANSWERS.NEW
UPDATE. JUST RELEASED
1. Where is the Sinoatrial (SA) node located in the heart?
A. Lower portion of the left atrium
B. Interventricular septum
C. Upper portion of the right atrium
D. Apex of the left ventricle
Answer: C
Conceptual Explanation: The SA node, the primary pacemaker of the heart, is located in
the upper posterior wall of the right atrium.
2. A PR interval is considered prolonged if it exceeds how many seconds?
A. 0.12 seconds
B. 0.16 seconds
C. 0.24 seconds
D. 0.20 seconds
Answer: D
,Conceptual Explanation: A normal PR interval is between 0.12 and 0.20 seconds.
Anything over 0.20 seconds indicates a first-degree AV block.
3. Which EKG lead is primarily used to view the septal wall of the heart?
A. Lead II
B. Lead aVL
C. Lead V5 and V6
D. Lead V1 and V2
Answer: D
Conceptual Explanation: Precordial leads V1 and V2 are positioned to provide the best
view of the interventricular septum.
4. What is the hallmark characteristic of a Mobitz Type I (Wenckebach) second-degree AV
block?
A. Constant PR intervals followed by a dropped QRS
B. Complete dissociation between P waves and QRS complexes
C. Progressive lengthening of the PR interval until a QRS is dropped
D. A PR interval longer than 0.20 seconds that remains constant
Answer: C
Conceptual Explanation: Wenckebach is characterized by a ‘longer, longer, longer, drop’
pattern of the PR interval.
, 5. A wide QRS complex (greater than 0.12s) most likely indicates which of the following?
A. Atrial depolarization delay
B. Normal ventricular conduction
C. Ventricular conduction delay or Bundle Branch Block
D. Accelerated AV node conduction
Answer: C
Conceptual Explanation: A wide QRS indicates that the impulse is taking longer to travel
through the ventricles, often due to a block in the bundle branches.
6. In a 12-lead EKG, which leads look at the inferior wall of the left ventricle?
A. I, aVL, V5, V6
B. II, III, aVF
C. V1, V2, V3, V4
D. aVR, V1
Answer: B
Conceptual Explanation: Leads II, III, and aVF view the inferior portion of the heart, which
is supplied by the Right Coronary Artery.
7. What rhythm is characterized by a ‘sawtooth’ pattern of P waves?
A. Atrial Fibrillation
