EKG certification Certification FREE EKG Certification MCQ Question and Answers 2 — Questions and Answers
Question 1: A patient's EKG shows a prolonged PR interval greater than 0.20 seconds with consistent P-to-QRS conduction. What is the most likely diagnosis?
- First-degree AV block (Correct answer)
- Second-degree AV block Type I
- Second-degree AV block Type II
- Third-degree AV block
Correct answer: First-degree AV block
A PR interval consistently greater than 0.20 seconds with every P wave followed by a QRS complex is the hallmark of first-degree AV block.
Question 2: Which EKG finding is most characteristic of hyperkalemia?
- Peaked T waves (Correct answer)
- Prolonged QT interval
- ST elevation in leads II, III, aVF
- Delta waves
Correct answer: Peaked T waves
Peaked, tall T waves are the earliest and most recognizable EKG manifestation of hyperkalemia.
Question 3: What does the QRS complex represent on an EKG tracing?
- Atrial depolarization
- Ventricular depolarization (Correct answer)
- Ventricular repolarization
- Atrial repolarization
Correct answer: Ventricular depolarization
The QRS complex represents the electrical depolarization of the right and left ventricles.
Question 4: A rhythm strip shows irregularly irregular R-R intervals with no identifiable P waves. What is the most likely rhythm?
- Atrial flutter
- Atrial fibrillation (Correct answer)
- Multifocal atrial tachycardia
- Sinus arrhythmia
Correct answer: Atrial fibrillation
Atrial fibrillation is characterized by irregularly irregular R-R intervals and the absence of distinct P waves due to chaotic atrial activity.
Question 5: In which lead grouping would you expect to see ST elevation during an anterior wall myocardial infarction?
- II, III, aVF
- I, aVL
- V1-V4 (Correct answer)
- V5, V6
Correct answer: V1-V4
Leads V1 through V4 overlie the anterior wall of the left ventricle and will show ST elevation during an anterior MI.
Question 6: What is the normal duration of the QRS complex in a healthy adult?
- Less than 0.04 seconds
- 0.06 to 0.10 seconds (Correct answer)
- 0.12 to 0.16 seconds
- 0.20 to 0.24 seconds
Correct answer: 0.06 to 0.10 seconds
The normal QRS duration is 0.06 to 0.10 seconds, indicating rapid and synchronized ventricular depolarization.
EKG certification Certification FREE EKG Certification MCQ Question and Answers 2
A patient's EKG shows a prolonged PR interval greater than 0.20 seconds with consistent P-to-QRS conduction.
What is the most likely diagnosis?