EKG TEST FOR HOUSTON METHODIST EXAM – QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED
ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
Core Domains
1. Cardiac Anatomy and Physiology
2. The Cardiac Conduction System
3. EKG Waveforms and Intervals
4. Rhythm Analysis and Interpretation
5. Sinus, Atrial, Junctional, and Ventricular Dysrhythmias
6. Atrioventricular (AV) Heart Blocks
7. EKG Lead Placement and Acquisition
8. Artifact Recognition and Troubleshooting
9. Pacemaker Fundamentals
10. Clinical Application and Emergency Response
Introduction
This comprehensive assessment is meticulously designed to prepare healthcare professionals for the EKG proficiency
examination administered by Houston Methodist. The exam rigorously evaluates foundational knowledge of cardiac
anatomy and electrophysiology, the technical skills required for accurate EKG acquisition, and the critical analytical
abilities necessary for precise rhythm interpretation. This examination utilizes a multiple-choice and scenario-based
format to assess your capacity to apply theoretical knowledge in practical, real-world clinical situations. Success on this
exam demonstrates a mastery of essential competencies, including the identification of lethal dysrhythmias,
appropriate decision-making regarding patient care, and a thorough understanding of professional standards and
protocols vital for ensuring patient safety and optimal outcomes within the Houston Methodist healthcare system.
,Question 1
During a standard 12-lead EKG, you notice that lead II and lead III are identical. What is the most likely cause of this
finding?
A. Electrodes placed on the wrong limbs
B. A patient with dextrocardia
C. An incorrectly calibrated machine
D. Normal variant in a tall, thin patient
🟢 Correct Answer: A. Electrodes placed on the wrong limbs
🔴 Explanation: If the left arm (LA) and left leg (LL) electrodes are reversed, lead II and lead III will look nearly
identical because they are essentially recording the same electrical vector. This is a common technical error to
identify and correct.
Question 2
A patient's EKG shows a regular rhythm with a heart rate of 120 bpm. There is a P wave before every QRS complex,
and the PR interval is 0.16 seconds. The QRS duration is 0.08 seconds. What is the correct interpretation?
A. Normal Sinus Rhythm
B. Sinus Tachycardia
C. Atrial Fibrillation
D. Sinus Arrhythmia
🟢 Correct Answer: B. Sinus Tachycardia
🔴 Explanation: This is a sinus rhythm because each QRS is preceded by a P wave. The rate is above 100 bpm, which
classifies it specifically as sinus tachycardia. The PR and QRS intervals are within normal limits .
Question 3
The normal intrinsic firing rate of the atrioventricular (AV) junction is which of the following?
A. 60-100 beats per minute
,B. 40-60 beats per minute
C. 20-40 beats per minute
D. 0-20 beats per minute
🟢 Correct Answer: B. 40-60 beats per minute
🔴 Explanation: The AV junction acts as the secondary pacemaker of the heart. If the SA node fails, the AV junction
will take over at its intrinsic rate of 40-60 bpm. The SA node has a rate of 60-100 bpm, and the Purkinje fibers have a
rate of 20-40 bpm .
Question 4
What is the normal duration of the QRS complex?
A. 0.04-0.10 seconds
B. 0.06-0.11 seconds
C. Less than 0.12 seconds
D. 0.12-0.20 seconds
🟢 Correct Answer: C. Less than 0.12 seconds
🔴 Explanation: The QRS complex represents ventricular depolarization. In a healthy heart, this depolarization occurs
quickly, with the QRS duration being less than 0.12 seconds (three small squares on standard EKG paper) .
Question 5
A patient is connected to a cardiac monitor, and the EKG tracing shows a wandering baseline. What is the most
appropriate action to correct this artifact?
A. Increase the gain on the monitor
B. Ensure the patient's skin is properly prepared and electrodes are secure
C. Notify the physician immediately
D. Change the paper speed to 50 mm/sec
🟢 Correct Answer: B. Ensure the patient's skin is properly prepared and electrodes are secure
🔴 Explanation: A wandering baseline is often caused by poor skin preparation, which leads to high impedance, or
, by loose electrodes. Proper skin prep (cleansing, drying, gentle abrasion) and secure electrode placement are the
first-line corrections .
Question 6
You are performing a 12-lead EKG on a 67-year-old male. To best view the heart's inferior wall, you must ensure
proper placement of which leads?
A. Leads V1-V4
B. Leads I, aVL, V5, V6
C. Leads II, III, aVF
D. Leads V3R, V4R
🟢 Correct Answer: C. Leads II, III, aVF
🔴 Explanation: Leads II, III, and aVF are the inferior leads. They view the inferior surface of the heart, which is
typically supplied by the right coronary artery. Changes in these leads can indicate an inferior wall myocardial
infarction .
Question 7
Which of the following rhythms is characterized by an irregularly irregular ventricular rhythm and the absence of
discernible P waves?
A. Atrial Flutter
B. Atrial Fibrillation
C. Multifocal Atrial Tachycardia
D. Wandering Atrial Pacemaker
🟢 Correct Answer: B. Atrial Fibrillation
🔴 Explanation: Atrial fibrillation is a common supraventricular arrhythmia characterized by chaotic, rapid electrical
impulses in the atria. This results in no coordinated P waves and an irregularly irregular ventricular response as
impulses are randomly conducted through the AV node .
ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
Core Domains
1. Cardiac Anatomy and Physiology
2. The Cardiac Conduction System
3. EKG Waveforms and Intervals
4. Rhythm Analysis and Interpretation
5. Sinus, Atrial, Junctional, and Ventricular Dysrhythmias
6. Atrioventricular (AV) Heart Blocks
7. EKG Lead Placement and Acquisition
8. Artifact Recognition and Troubleshooting
9. Pacemaker Fundamentals
10. Clinical Application and Emergency Response
Introduction
This comprehensive assessment is meticulously designed to prepare healthcare professionals for the EKG proficiency
examination administered by Houston Methodist. The exam rigorously evaluates foundational knowledge of cardiac
anatomy and electrophysiology, the technical skills required for accurate EKG acquisition, and the critical analytical
abilities necessary for precise rhythm interpretation. This examination utilizes a multiple-choice and scenario-based
format to assess your capacity to apply theoretical knowledge in practical, real-world clinical situations. Success on this
exam demonstrates a mastery of essential competencies, including the identification of lethal dysrhythmias,
appropriate decision-making regarding patient care, and a thorough understanding of professional standards and
protocols vital for ensuring patient safety and optimal outcomes within the Houston Methodist healthcare system.
,Question 1
During a standard 12-lead EKG, you notice that lead II and lead III are identical. What is the most likely cause of this
finding?
A. Electrodes placed on the wrong limbs
B. A patient with dextrocardia
C. An incorrectly calibrated machine
D. Normal variant in a tall, thin patient
🟢 Correct Answer: A. Electrodes placed on the wrong limbs
🔴 Explanation: If the left arm (LA) and left leg (LL) electrodes are reversed, lead II and lead III will look nearly
identical because they are essentially recording the same electrical vector. This is a common technical error to
identify and correct.
Question 2
A patient's EKG shows a regular rhythm with a heart rate of 120 bpm. There is a P wave before every QRS complex,
and the PR interval is 0.16 seconds. The QRS duration is 0.08 seconds. What is the correct interpretation?
A. Normal Sinus Rhythm
B. Sinus Tachycardia
C. Atrial Fibrillation
D. Sinus Arrhythmia
🟢 Correct Answer: B. Sinus Tachycardia
🔴 Explanation: This is a sinus rhythm because each QRS is preceded by a P wave. The rate is above 100 bpm, which
classifies it specifically as sinus tachycardia. The PR and QRS intervals are within normal limits .
Question 3
The normal intrinsic firing rate of the atrioventricular (AV) junction is which of the following?
A. 60-100 beats per minute
,B. 40-60 beats per minute
C. 20-40 beats per minute
D. 0-20 beats per minute
🟢 Correct Answer: B. 40-60 beats per minute
🔴 Explanation: The AV junction acts as the secondary pacemaker of the heart. If the SA node fails, the AV junction
will take over at its intrinsic rate of 40-60 bpm. The SA node has a rate of 60-100 bpm, and the Purkinje fibers have a
rate of 20-40 bpm .
Question 4
What is the normal duration of the QRS complex?
A. 0.04-0.10 seconds
B. 0.06-0.11 seconds
C. Less than 0.12 seconds
D. 0.12-0.20 seconds
🟢 Correct Answer: C. Less than 0.12 seconds
🔴 Explanation: The QRS complex represents ventricular depolarization. In a healthy heart, this depolarization occurs
quickly, with the QRS duration being less than 0.12 seconds (three small squares on standard EKG paper) .
Question 5
A patient is connected to a cardiac monitor, and the EKG tracing shows a wandering baseline. What is the most
appropriate action to correct this artifact?
A. Increase the gain on the monitor
B. Ensure the patient's skin is properly prepared and electrodes are secure
C. Notify the physician immediately
D. Change the paper speed to 50 mm/sec
🟢 Correct Answer: B. Ensure the patient's skin is properly prepared and electrodes are secure
🔴 Explanation: A wandering baseline is often caused by poor skin preparation, which leads to high impedance, or
, by loose electrodes. Proper skin prep (cleansing, drying, gentle abrasion) and secure electrode placement are the
first-line corrections .
Question 6
You are performing a 12-lead EKG on a 67-year-old male. To best view the heart's inferior wall, you must ensure
proper placement of which leads?
A. Leads V1-V4
B. Leads I, aVL, V5, V6
C. Leads II, III, aVF
D. Leads V3R, V4R
🟢 Correct Answer: C. Leads II, III, aVF
🔴 Explanation: Leads II, III, and aVF are the inferior leads. They view the inferior surface of the heart, which is
typically supplied by the right coronary artery. Changes in these leads can indicate an inferior wall myocardial
infarction .
Question 7
Which of the following rhythms is characterized by an irregularly irregular ventricular rhythm and the absence of
discernible P waves?
A. Atrial Flutter
B. Atrial Fibrillation
C. Multifocal Atrial Tachycardia
D. Wandering Atrial Pacemaker
🟢 Correct Answer: B. Atrial Fibrillation
🔴 Explanation: Atrial fibrillation is a common supraventricular arrhythmia characterized by chaotic, rapid electrical
impulses in the atria. This results in no coordinated P waves and an irregularly irregular ventricular response as
impulses are randomly conducted through the AV node .
