HOAG ECG EXAM UPDATED ACTUAL EXAM
QUESTIONS AND CORRECT ANSWERS
Question 1
Which cardiac structure normally initiates the electrical impulse?
A. AV node
B. Bundle of His
C. SA node
D. Purkinje fibers
Answer: C
Rationale: The sinoatrial (SA) node is the heart's natural pacemaker,
normally firing at 60–100 bpm.
Question 2
A normal PR interval is:
A. 0.04–0.08 sec
B. 0.12–0.20 sec
C. 0.24–0.30 sec
D. Greater than 0.30 sec
Answer: B
Rationale: Normal AV conduction produces a PR interval between 0.12
and 0.20 seconds.
,Question 3
The normal QRS duration is:
A. Less than 0.12 sec
B. Greater than 0.20 sec
C. 0.20–0.30 sec
D. Exactly 0.16 sec
Answer: A
Question 4
Which rhythm is considered the normal cardiac rhythm?
A. Atrial flutter
B. Sinus rhythm
C. Ventricular tachycardia
D. Junctional rhythm
Answer: B
Question 5
A patient has:
• Regular rhythm
• Rate 75 bpm
• Upright P wave before every QRS
• Normal PR interval
The rhythm is:
, A. Sinus rhythm
B. Sinus tachycardia
C. Junctional rhythm
D. Atrial flutter
Answer: A
Question 6
Which electrolyte abnormality commonly produces tall peaked T waves?
A. Hypokalemia
B. Hyperkalemia
C. Hypocalcemia
D. Hyponatremia
Answer: B
Question 7
Sinus bradycardia is defined as:
A. HR <60 bpm
B. HR <50 bpm
C. HR <40 bpm
D. HR <30 bpm
Answer: A
Question 8
QUESTIONS AND CORRECT ANSWERS
Question 1
Which cardiac structure normally initiates the electrical impulse?
A. AV node
B. Bundle of His
C. SA node
D. Purkinje fibers
Answer: C
Rationale: The sinoatrial (SA) node is the heart's natural pacemaker,
normally firing at 60–100 bpm.
Question 2
A normal PR interval is:
A. 0.04–0.08 sec
B. 0.12–0.20 sec
C. 0.24–0.30 sec
D. Greater than 0.30 sec
Answer: B
Rationale: Normal AV conduction produces a PR interval between 0.12
and 0.20 seconds.
,Question 3
The normal QRS duration is:
A. Less than 0.12 sec
B. Greater than 0.20 sec
C. 0.20–0.30 sec
D. Exactly 0.16 sec
Answer: A
Question 4
Which rhythm is considered the normal cardiac rhythm?
A. Atrial flutter
B. Sinus rhythm
C. Ventricular tachycardia
D. Junctional rhythm
Answer: B
Question 5
A patient has:
• Regular rhythm
• Rate 75 bpm
• Upright P wave before every QRS
• Normal PR interval
The rhythm is:
, A. Sinus rhythm
B. Sinus tachycardia
C. Junctional rhythm
D. Atrial flutter
Answer: A
Question 6
Which electrolyte abnormality commonly produces tall peaked T waves?
A. Hypokalemia
B. Hyperkalemia
C. Hypocalcemia
D. Hyponatremia
Answer: B
Question 7
Sinus bradycardia is defined as:
A. HR <60 bpm
B. HR <50 bpm
C. HR <40 bpm
D. HR <30 bpm
Answer: A
Question 8
