BayCare EKG Test 2025/2026 | Study
Guide and Practice Material
Question 1
What is the normal duration of the PR interval in a healthy EKG?
A) 0.06–0.10 seconds
B) 0.12–0.20 seconds
C) 0.21–0.30 seconds
D) 0.30–0.40 seconds
Correct Answer: B
Rationale : The PR interval, measuring AV node conduction, is normally 0.12–0.20 seconds
(120–200 ms) in adults (AHA EKG Guidelines, 2023). Shorter (A) suggests accelerated
conduction, longer (C, D) indicates AV block.
Question 2
Which rhythm is characterized by absent P waves and irregular ventricular rhythm?
A) Sinus tachycardia
B) Atrial fibrillation
C) Ventricular tachycardia
D) Second-degree AV block
Correct Answer: B
Rationale : Atrial fibrillation shows no distinct P waves and an irregularly irregular QRS rhythm
due to chaotic atrial activity (AHA/ACC Guidelines, 2023). Sinus (A) has P waves, ventricular
tachycardia (C) regular, AV block (D) has P waves.
Question 3
, What does the QRS complex represent on an EKG?
A) Atrial depolarization
B) Ventricular depolarization
C) Atrial repolarization
D) Ventricular repolarization
Correct Answer: B
Rationale : The QRS complex reflects ventricular depolarization (AHA EKG Interpretation, 2023).
Atrial depolarization (A) is the P wave, atrial repolarization (C) is obscured, ventricular
repolarization (D) is the T wave.
Question 4
What is the normal heart rate range for sinus rhythm?
A) 40–60 bpm
B) 60–100 bpm
C) 100–120 bpm
D) 120–150 bpm
Correct Answer: B
Rationale : Normal sinus rhythm is 60–100 bpm in adults at rest (AHA, 2023). Lower (A)
suggests bradycardia, higher (C, D) tachycardia.
Question 5
Which lead is best for monitoring atrial activity?
A) Lead I
B) Lead II
C) Lead V1
D) Lead aVR
Correct Answer: B
Rationale : Lead II aligns with the heart’s electrical axis, providing clear P waves for atrial activity
(AHA EKG Guidelines, 2023). Lead I (A) is less optimal, V1 (C) for ventricles, aVR (D) poor for
atrial.
Question 6
Guide and Practice Material
Question 1
What is the normal duration of the PR interval in a healthy EKG?
A) 0.06–0.10 seconds
B) 0.12–0.20 seconds
C) 0.21–0.30 seconds
D) 0.30–0.40 seconds
Correct Answer: B
Rationale : The PR interval, measuring AV node conduction, is normally 0.12–0.20 seconds
(120–200 ms) in adults (AHA EKG Guidelines, 2023). Shorter (A) suggests accelerated
conduction, longer (C, D) indicates AV block.
Question 2
Which rhythm is characterized by absent P waves and irregular ventricular rhythm?
A) Sinus tachycardia
B) Atrial fibrillation
C) Ventricular tachycardia
D) Second-degree AV block
Correct Answer: B
Rationale : Atrial fibrillation shows no distinct P waves and an irregularly irregular QRS rhythm
due to chaotic atrial activity (AHA/ACC Guidelines, 2023). Sinus (A) has P waves, ventricular
tachycardia (C) regular, AV block (D) has P waves.
Question 3
, What does the QRS complex represent on an EKG?
A) Atrial depolarization
B) Ventricular depolarization
C) Atrial repolarization
D) Ventricular repolarization
Correct Answer: B
Rationale : The QRS complex reflects ventricular depolarization (AHA EKG Interpretation, 2023).
Atrial depolarization (A) is the P wave, atrial repolarization (C) is obscured, ventricular
repolarization (D) is the T wave.
Question 4
What is the normal heart rate range for sinus rhythm?
A) 40–60 bpm
B) 60–100 bpm
C) 100–120 bpm
D) 120–150 bpm
Correct Answer: B
Rationale : Normal sinus rhythm is 60–100 bpm in adults at rest (AHA, 2023). Lower (A)
suggests bradycardia, higher (C, D) tachycardia.
Question 5
Which lead is best for monitoring atrial activity?
A) Lead I
B) Lead II
C) Lead V1
D) Lead aVR
Correct Answer: B
Rationale : Lead II aligns with the heart’s electrical axis, providing clear P waves for atrial activity
(AHA EKG Guidelines, 2023). Lead I (A) is less optimal, V1 (C) for ventricles, aVR (D) poor for
atrial.
Question 6
