NCCT Electrocardiography Technician Fundamentals 2 — Questions and Answers
Question 1: On ECG graph paper, each small box represents how many seconds at standard speed?
- 0.02 seconds
- 0.04 seconds (Correct answer)
- 0.08 seconds
- 0.10 seconds
Correct answer: 0.04 seconds
At standard ECG paper speed of 25 mm/sec, each small (1 mm) box represents 0.04 seconds.
Question 2: Atrial fibrillation is characterized by which ECG finding?
- Regularly irregular rhythm with wide QRS
- Absent P waves with an irregularly irregular rhythm (Correct answer)
- Peaked T waves with prolonged QT interval
- Saw-tooth baseline at 300 bpm
Correct answer: Absent P waves with an irregularly irregular rhythm
Atrial fibrillation shows no identifiable P waves and an irregularly irregular ventricular rhythm due to chaotic atrial activity.
Question 3: Which ECG change is classically associated with acute myocardial infarction?
- PR interval prolongation
- ST segment elevation (Correct answer)
- Shortened QT interval
- Prominent U waves
Correct answer: ST segment elevation
ST segment elevation in contiguous leads is a classic ECG sign of acute ST-elevation myocardial infarction (STEMI).
Question 4: A heart rate of 150 bpm with a narrow QRS and no visible P waves is most consistent with:
- Sinus tachycardia
- Ventricular tachycardia
- Supraventricular tachycardia (SVT) (Correct answer)
- Third-degree heart block
Correct answer: Supraventricular tachycardia (SVT)
A narrow-complex tachycardia at 150 bpm without visible P waves is characteristic of supraventricular tachycardia (SVT).
Question 5: Proper skin preparation before applying ECG electrodes includes:
- Applying lotion to improve adhesion
- Shaving excess hair and cleaning the skin with alcohol (Correct answer)
- Using wet electrodes without skin preparation
- Applying electrodes over clothing for comfort
Correct answer: Shaving excess hair and cleaning the skin with alcohol
Shaving excess hair and cleansing the skin with alcohol removes oils and dead skin cells to improve electrode contact.
Question 6: The T wave on an ECG represents:
- Atrial repolarization
- Ventricular depolarization
- Ventricular repolarization (Correct answer)
- AV nodal delay
Correct answer: Ventricular repolarization
The T wave represents ventricular repolarization, during which the ventricles recover electrically between beats.
NCCT Electrocardiography Technician Fundamentals 2
On ECG graph paper, each small box represents how many seconds at standard speed?