Page 1 of 45
APEX EKG 2026 EXAM PREP COMPLETE (150)
CURRENT TESTING QUESTIONS AND
CORRECT ANSWERS WITH DETAILED
EXPLANATIONS|GUARANTEED PASS.
APEX
Prepare for the APEX EKG Exam Prep with practice questions covering
cardiac anatomy, ECG rhythm interpretation, heart conduction
systems, arrhythmias, patient monitoring, and EKG procedures. This
study guide helps reinforce essential electrocardiography concepts
and supports effective exam preparation. Designed to improve rhythm
recognition skills and boost confidence in cardiac patient care.
Suitable for nursing, allied health, and healthcare professionals.
MULTIPLE CHOICE.
Section 1: Basic Principles & Electrophysiology (Questions
1-25)
1. What is the normal duration of a PR interval?
• A) 0.04-0.10 sec
• B) 0.12-0.20 sec
• C) 0.20-0.30 sec
• D) 0.35-0.45 sec
Answer: B – Normal PR interval is 0.12-0.20 sec (3-5 small boxes). Longer suggests AV
block; shorter suggests pre-excitation.
2. Which lead views the heart’s inferior wall?
• A) V1-V2
• B) I, aVL
• C) II, III, aVF
• D) V5-V6
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Answer: C – Leads II, III, aVF face the inferior wall (right coronary artery territory).
3. What does the QRS complex represent?
• A) Atrial depolarization
• B) Ventricular depolarization
• C) Ventricular repolarization
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• D) Atrial repolarization
Answer: B – QRS represents ventricular depolarization. Atrial repolarization is hidden
within QRS.
4. Normal QRS duration is:
• A) <0.06 sec
• B) <0.10 sec
• C) <0.12 sec
• D) <0.20 sec
Answer: C – Normal QRS is <0.12 sec (3 small boxes). >0.12 sec indicates bundle branch
block or ventricular rhythm.
5. Which statement about the QT interval is correct?
• A) Shortens as heart rate increases
• B) Lengthens as heart rate increases
• C) Unaffected by heart rate
• D) Represents atrial depolarization
Answer: A – QT shortens with increased heart rate. Corrected QT (QTc) adjusts for rate.
6. Normal P wave axis is:
• A) 0° to +90°
• B) –30° to +90°
• C) 0° to -90°
• D) +90° to +180°
Answer: A – Normal sinus P wave axis is 0° to +90° (upright in I, II, aVF).
7. What is the paper speed for standard EKG recording?
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• A) 25 mm/sec
• B) 50 mm/sec
• C) 10 mm/sec
• D) 100 mm/sec
Answer: A – Standard is 25 mm/sec. At 25 mm/sec: 1 small box = 0.04 sec, 1 large box
= 0.20 sec.
8. How many seconds is one large box (5 mm) at standard speed?
• A) 0.04 sec
• B) 0.10 sec
• C) 0.20 sec
• D) 0.40 sec
Answer: C – One large box = 5 small boxes × 0.04 sec = 0.20 sec.
9. Which ion primarily mediates phase 0 (rapid depolarization) in ventricular
myocytes?
• A) Calcium
• B) Sodium
• C) Potassium
• D) Chloride
Answer: B – Fast sodium channels cause phase 0 in ventricular and Purkinje cells.
Calcium mediates phase 0 in SA/AV nodes.
10. Absolute refractory period corresponds to which EKG segment?
• A) P wave through beginning of QRS
• B) QRS through peak of T wave
• C) End of T wave to next P wave
• D) PR interval
APEX EKG 2026 EXAM PREP COMPLETE (150)
CURRENT TESTING QUESTIONS AND
CORRECT ANSWERS WITH DETAILED
EXPLANATIONS|GUARANTEED PASS.
APEX
Prepare for the APEX EKG Exam Prep with practice questions covering
cardiac anatomy, ECG rhythm interpretation, heart conduction
systems, arrhythmias, patient monitoring, and EKG procedures. This
study guide helps reinforce essential electrocardiography concepts
and supports effective exam preparation. Designed to improve rhythm
recognition skills and boost confidence in cardiac patient care.
Suitable for nursing, allied health, and healthcare professionals.
MULTIPLE CHOICE.
Section 1: Basic Principles & Electrophysiology (Questions
1-25)
1. What is the normal duration of a PR interval?
• A) 0.04-0.10 sec
• B) 0.12-0.20 sec
• C) 0.20-0.30 sec
• D) 0.35-0.45 sec
Answer: B – Normal PR interval is 0.12-0.20 sec (3-5 small boxes). Longer suggests AV
block; shorter suggests pre-excitation.
2. Which lead views the heart’s inferior wall?
• A) V1-V2
• B) I, aVL
• C) II, III, aVF
• D) V5-V6
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Answer: C – Leads II, III, aVF face the inferior wall (right coronary artery territory).
3. What does the QRS complex represent?
• A) Atrial depolarization
• B) Ventricular depolarization
• C) Ventricular repolarization
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• D) Atrial repolarization
Answer: B – QRS represents ventricular depolarization. Atrial repolarization is hidden
within QRS.
4. Normal QRS duration is:
• A) <0.06 sec
• B) <0.10 sec
• C) <0.12 sec
• D) <0.20 sec
Answer: C – Normal QRS is <0.12 sec (3 small boxes). >0.12 sec indicates bundle branch
block or ventricular rhythm.
5. Which statement about the QT interval is correct?
• A) Shortens as heart rate increases
• B) Lengthens as heart rate increases
• C) Unaffected by heart rate
• D) Represents atrial depolarization
Answer: A – QT shortens with increased heart rate. Corrected QT (QTc) adjusts for rate.
6. Normal P wave axis is:
• A) 0° to +90°
• B) –30° to +90°
• C) 0° to -90°
• D) +90° to +180°
Answer: A – Normal sinus P wave axis is 0° to +90° (upright in I, II, aVF).
7. What is the paper speed for standard EKG recording?
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• A) 25 mm/sec
• B) 50 mm/sec
• C) 10 mm/sec
• D) 100 mm/sec
Answer: A – Standard is 25 mm/sec. At 25 mm/sec: 1 small box = 0.04 sec, 1 large box
= 0.20 sec.
8. How many seconds is one large box (5 mm) at standard speed?
• A) 0.04 sec
• B) 0.10 sec
• C) 0.20 sec
• D) 0.40 sec
Answer: C – One large box = 5 small boxes × 0.04 sec = 0.20 sec.
9. Which ion primarily mediates phase 0 (rapid depolarization) in ventricular
myocytes?
• A) Calcium
• B) Sodium
• C) Potassium
• D) Chloride
Answer: B – Fast sodium channels cause phase 0 in ventricular and Purkinje cells.
Calcium mediates phase 0 in SA/AV nodes.
10. Absolute refractory period corresponds to which EKG segment?
• A) P wave through beginning of QRS
• B) QRS through peak of T wave
• C) End of T wave to next P wave
• D) PR interval
