NHA Certified EKG Technician 2026 Update Questions
And -answers With Correct -answers
Section 1: Cardiac Anatomy & Physiology
Question 1: Primary Pacemaker
What is the normal pacemaker of the heart with an intrinsic rate of 60-100 bpm?
A) AV node
B) Bundle of His
C) Sinoatrial (SA) node
D) Purkinje fibers
Rotation: Which structure has an intrinsic rate of 40-60 bpm and serves as the
secondary pacemaker?
A) SA node
B) AV node
C) Right bundle branch
D) Left atrial focus
-answer: C
Question 2: Cardiac Conduction Pathway
What is the correct sequence of electrical conduction through the heart?
A) SA node → AV node → Bundle of His → Bundle branches → Purkinje fibers
B) AV node → SA node → Purkinje fibers → Bundle branches
C) Bundle of His → AV node → SA node → Purkinje fibers
D) Purkinje fibers → Bundle branches → AV node → SA node
Rotation: Where does the electrical impulse normally delay to allow ventricular
filling?
,A) SA node
B) AV node
C) Right bundle branch
D) Left ventricular myocardium
-answer: A
Question 3: Coronary Arteries
Which coronary artery primarily supplies the right ventricle?
A) Left anterior descending (LAD)
B) Left circumflex (LCx)
C) Right coronary artery (RCA)
D) Posterior descending artery (PDA)
Rotation: The "widow maker" artery refers to:
A) Right coronary artery
B) Left circumflex artery
C) Proximal left anterior descending artery
D) Posterior descending artery
-answer: C
Section 2: EKG Basics & Lead Placement
Question 4: 12-Lead EKG Components
How many leads does a standard 12-lead EKG actually have?
A) 12 wires
B) 10 wires
C) 6 wires
D) 5 wires
Rotation: Which leads are considered the limb leads?
A) V1-V6
B) I, II, III, aVR, aVL, aVF
C) V1, V2, V3
D) II, III, aVF
, -answer: B
Question 5: Precordial Lead Placement
Where is V1 correctly placed?
A) 4th intercostal space, right sternal border
B) 4th intercostal space, left sternal border
C) 5th intercostal space, midclavicular line
D) 5th intercostal space, anterior axillary line
Rotation: V4 is placed at the:
A) 4th intercostal space, right sternal border
B) 5th intercostal space, midclavicular line
C) 5th intercostal space, anterior axillary line
D) 6th intercostal space, midclavicular line
-answer: A
Question 6: Lead Views
Which leads view the inferior wall of the heart?
A) I, aVL, V5, V6
B) II, III, aVF
C) V1, V2, V3
D) aVR, V1
Rotation: The lateral wall is best viewed by which leads?
A) V1-V3
B) II, III, aVF
C) I, aVL, V5, V6
D) V4R
-answer: B
Section 3: EKG Interpretation Fundamentals
Question 7: Heart Rate Calculation
If there are 20 large boxes between two R waves, what is the heart rate?
A) 75 bpm
And -answers With Correct -answers
Section 1: Cardiac Anatomy & Physiology
Question 1: Primary Pacemaker
What is the normal pacemaker of the heart with an intrinsic rate of 60-100 bpm?
A) AV node
B) Bundle of His
C) Sinoatrial (SA) node
D) Purkinje fibers
Rotation: Which structure has an intrinsic rate of 40-60 bpm and serves as the
secondary pacemaker?
A) SA node
B) AV node
C) Right bundle branch
D) Left atrial focus
-answer: C
Question 2: Cardiac Conduction Pathway
What is the correct sequence of electrical conduction through the heart?
A) SA node → AV node → Bundle of His → Bundle branches → Purkinje fibers
B) AV node → SA node → Purkinje fibers → Bundle branches
C) Bundle of His → AV node → SA node → Purkinje fibers
D) Purkinje fibers → Bundle branches → AV node → SA node
Rotation: Where does the electrical impulse normally delay to allow ventricular
filling?
,A) SA node
B) AV node
C) Right bundle branch
D) Left ventricular myocardium
-answer: A
Question 3: Coronary Arteries
Which coronary artery primarily supplies the right ventricle?
A) Left anterior descending (LAD)
B) Left circumflex (LCx)
C) Right coronary artery (RCA)
D) Posterior descending artery (PDA)
Rotation: The "widow maker" artery refers to:
A) Right coronary artery
B) Left circumflex artery
C) Proximal left anterior descending artery
D) Posterior descending artery
-answer: C
Section 2: EKG Basics & Lead Placement
Question 4: 12-Lead EKG Components
How many leads does a standard 12-lead EKG actually have?
A) 12 wires
B) 10 wires
C) 6 wires
D) 5 wires
Rotation: Which leads are considered the limb leads?
A) V1-V6
B) I, II, III, aVR, aVL, aVF
C) V1, V2, V3
D) II, III, aVF
, -answer: B
Question 5: Precordial Lead Placement
Where is V1 correctly placed?
A) 4th intercostal space, right sternal border
B) 4th intercostal space, left sternal border
C) 5th intercostal space, midclavicular line
D) 5th intercostal space, anterior axillary line
Rotation: V4 is placed at the:
A) 4th intercostal space, right sternal border
B) 5th intercostal space, midclavicular line
C) 5th intercostal space, anterior axillary line
D) 6th intercostal space, midclavicular line
-answer: A
Question 6: Lead Views
Which leads view the inferior wall of the heart?
A) I, aVL, V5, V6
B) II, III, aVF
C) V1, V2, V3
D) aVR, V1
Rotation: The lateral wall is best viewed by which leads?
A) V1-V3
B) II, III, aVF
C) I, aVL, V5, V6
D) V4R
-answer: B
Section 3: EKG Interpretation Fundamentals
Question 7: Heart Rate Calculation
If there are 20 large boxes between two R waves, what is the heart rate?
A) 75 bpm
