EKG certification Certification FREE EKG Technician Certification Question and Answers 2 — Questions and Answers
Question 1: Which lead placement corresponds to the V4 precordial lead position?
- Fourth intercostal space, right sternal border
- Fifth intercostal space, midclavicular line (Correct answer)
- Fifth intercostal space, anterior axillary line
- Fourth intercostal space, left sternal border
Correct answer: Fifth intercostal space, midclavicular line
V4 is correctly placed at the fifth intercostal space at the left midclavicular line, directly over the cardiac apex.
Question 2: What does a prolonged QT interval on an EKG most commonly indicate?
- Increased risk of ventricular arrhythmias (Correct answer)
- Left atrial enlargement
- Right bundle branch block
- Pericardial effusion
Correct answer: Increased risk of ventricular arrhythmias
A prolonged QT interval increases the risk of torsades de pointes and other dangerous ventricular arrhythmias.
Question 3: An EKG technician notices significant baseline wander on the tracing. What is the most likely cause?
- Electrical interference from nearby equipment
- Patient movement or respiratory artifact (Correct answer)
- Dried-out electrode gel
- Incorrect calibration of the machine
Correct answer: Patient movement or respiratory artifact
Baseline wander is most commonly caused by patient movement, respirations, or loose electrodes shifting with body motion.
Question 4: In a 12-lead EKG, which leads are considered the inferior leads?
- I, aVL, V5, V6
- V1, V2, V3, V4
- II, III, aVF (Correct answer)
- aVR, V1, V2
Correct answer: II, III, aVF
Leads II, III, and aVF view the inferior wall of the heart supplied primarily by the right coronary artery.
Question 5: What is the normal duration of the PR interval in an adult patient?
- 0.06 to 0.10 seconds
- 0.12 to 0.20 seconds (Correct answer)
- 0.22 to 0.30 seconds
- 0.32 to 0.40 seconds
Correct answer: 0.12 to 0.20 seconds
The normal PR interval ranges from 0.12 to 0.20 seconds, representing conduction from the atria through the AV node to the ventricles.
Question 6: Which EKG finding is most characteristic of atrial fibrillation?
- Irregularly irregular rhythm with absent P waves (Correct answer)
- Regular rhythm with sawtooth-shaped flutter waves
- Wide QRS complexes occurring at a regular rate
- Tall peaked T waves with shortened QT interval
Correct answer: Irregularly irregular rhythm with absent P waves
Atrial fibrillation presents with an irregularly irregular ventricular rhythm and no identifiable P waves due to chaotic atrial electrical activity.
EKG certification Certification FREE EKG Technician Certification Question and Answers 2
Which lead placement corresponds to the V4 precordial lead position?