EKG CLEP TEST MIDTERM
COMPREHENSIVE STUDY GUIDE
QUESTIONS WITH VERIFIED
ANSWERS.NEW UPDATE. JUST
RELEASED
1. What is the primary pacemaker of the heart, typically firing at a rate of 60-100 beats per
minute?
A. AV Node
B. Purkinje Fibers
C. SA Node
D. Bundle of His
Answer: C
Conceptual Explanation: The Sinoatrial (SA) node is the heart’s natural pacemaker,
located in the right atrium, and initiates the electrical impulse.
2. A normal PR interval should measure between which of the following time ranges?
A. 0.12 - 0.20 seconds
B. 0.04 - 0.10 seconds
C. 0.20 - 0.35 seconds
,D. 0.06 - 0.12 seconds
Answer: A
Conceptual Explanation: The PR interval represents the time from atrial depolarization to
the start of ventricular depolarization; its normal range is 0.12 to 0.20 seconds (3-5 small
boxes).
3. Which waveform represents ventricular repolarization on an EKG tracing?
A. T wave
B. QRS complex
C. U wave
D. P wave
Answer: A
Conceptual Explanation: The T wave represents the recovery or repolarization phase of
the ventricles.
4. Where should the V1 electrode be placed during a standard 12-lead EKG setup?
A. Fourth intercostal space, left sternal border
B. Fourth intercostal space, right sternal border
C. Fifth intercostal space, mid-clavicular line
D. Fifth intercostal space, anterior axillary line
, Answer: B
Conceptual Explanation: Lead V1 is positioned in the 4th intercostal space just to the
right of the sternum.
5. A QRS complex that measures 0.16 seconds is considered:
A. Normal
B. Junctional
C. Abnormally wide
D. Abnormally narrow
Answer: C
Conceptual Explanation: A normal QRS complex is less than 0.12 seconds. A measurement
of 0.16 indicates delayed ventricular conduction, such as a bundle branch block.
6. Which heart rhythm is characterized by a ‘sawtooth’ pattern of P waves?
A. Atrial Fibrillation
B. Ventricular Tachycardia
C. Sinus Arrhythmia
D. Atrial Flutter
Answer: D
COMPREHENSIVE STUDY GUIDE
QUESTIONS WITH VERIFIED
ANSWERS.NEW UPDATE. JUST
RELEASED
1. What is the primary pacemaker of the heart, typically firing at a rate of 60-100 beats per
minute?
A. AV Node
B. Purkinje Fibers
C. SA Node
D. Bundle of His
Answer: C
Conceptual Explanation: The Sinoatrial (SA) node is the heart’s natural pacemaker,
located in the right atrium, and initiates the electrical impulse.
2. A normal PR interval should measure between which of the following time ranges?
A. 0.12 - 0.20 seconds
B. 0.04 - 0.10 seconds
C. 0.20 - 0.35 seconds
,D. 0.06 - 0.12 seconds
Answer: A
Conceptual Explanation: The PR interval represents the time from atrial depolarization to
the start of ventricular depolarization; its normal range is 0.12 to 0.20 seconds (3-5 small
boxes).
3. Which waveform represents ventricular repolarization on an EKG tracing?
A. T wave
B. QRS complex
C. U wave
D. P wave
Answer: A
Conceptual Explanation: The T wave represents the recovery or repolarization phase of
the ventricles.
4. Where should the V1 electrode be placed during a standard 12-lead EKG setup?
A. Fourth intercostal space, left sternal border
B. Fourth intercostal space, right sternal border
C. Fifth intercostal space, mid-clavicular line
D. Fifth intercostal space, anterior axillary line
, Answer: B
Conceptual Explanation: Lead V1 is positioned in the 4th intercostal space just to the
right of the sternum.
5. A QRS complex that measures 0.16 seconds is considered:
A. Normal
B. Junctional
C. Abnormally wide
D. Abnormally narrow
Answer: C
Conceptual Explanation: A normal QRS complex is less than 0.12 seconds. A measurement
of 0.16 indicates delayed ventricular conduction, such as a bundle branch block.
6. Which heart rhythm is characterized by a ‘sawtooth’ pattern of P waves?
A. Atrial Fibrillation
B. Ventricular Tachycardia
C. Sinus Arrhythmia
D. Atrial Flutter
Answer: D
