BASIC ARRHYTHMIA Sentara Test Questions and Answers Graded A+..
BASIC ARRHYTHMIA SENTARA TEST - 200 Practice Questions & Answers
SECTION 1: ECG BASICS & NORMAL VALUES (Questions 1-25)
1. What is the normal duration of the PR interval?
A) 0.04-0.10 seconds
B) 0.06-0.12 seconds
C) 0.12-0.20 seconds
D) 0.20-0.32 seconds
Answer: C) 0.12-0.20 seconds
Rationale: The PR interval represents the time for the electrical impulse to travel
from the sinus node through the atria, AV node, and bundle of His. A prolonged
PR interval (>0.20 seconds) indicates a first-degree AV block .
2. What is the normal duration of the QRS complex?
A) 0.04-0.10 seconds
B) 0.06-0.12 seconds
C) 0.12-0.20 seconds
D) 0.20-0.32 seconds
,Answer: B) 0.06-0.12 seconds
Rationale: The QRS complex represents ventricular depolarization. A "wide" QRS
(>0.12 seconds) indicates the electrical impulse is taking an abnormal pathway
through the ventricles (e.g., PVC or bundle branch block) .
3. What does the P wave represent on an ECG?
A) Ventricular depolarization
B) Atrial depolarization
C) Ventricular repolarization
D) AV node conduction
Answer: B) Atrial depolarization
Rationale: The P wave represents atrial depolarization (contraction) generated
when the sinus node fires and the electrical impulse spreads through the right
and left atria .
4. What does the QRS complex represent?
A) Atrial depolarization
B) Ventricular repolarization
C) Ventricular depolarization
,D) Purkinje fiber repolarization
Answer: C) Ventricular depolarization
Rationale: This is the large waveform on the ECG representing the electrical
activation of the thick ventricular muscle mass .
5. What is the length of a small square on standard EKG paper?
A) 0.02 seconds
B) 0.04 seconds
C) 0.10 seconds
D) 0.20 seconds
Answer: B) 0.04 seconds
Rationale: EKG paper runs at 25 mm/second. Each small 1 mm box equals 0.04
seconds. Five small boxes (one large box) equals 0.20 seconds .
6. How many large boxes equal 1 second on EKG paper?
A) 1
B) 3
C) 5
, D) 10
Answer: C) 5
Rationale: Each large box equals 0.20 seconds. Five large boxes (25 small boxes)
equals 1 second. This is used for calculating heart rate .
7. What is the normal QT interval duration?
A) 0.06-0.12 seconds
B) 0.12-0.20 seconds
C) 0.32-0.44 seconds
D) 0.44-0.52 seconds
Answer: C) 0.32-0.44 seconds
Rationale: The QT interval represents total time for ventricular depolarization and
repolarization. Prolonged QT intervals (often from medications) increase the risk
for Torsades de Pointes .
8. Which of the following is the correct sequence of waves in a normal ECG
complex?
A) Q-R-S-T-P
BASIC ARRHYTHMIA SENTARA TEST - 200 Practice Questions & Answers
SECTION 1: ECG BASICS & NORMAL VALUES (Questions 1-25)
1. What is the normal duration of the PR interval?
A) 0.04-0.10 seconds
B) 0.06-0.12 seconds
C) 0.12-0.20 seconds
D) 0.20-0.32 seconds
Answer: C) 0.12-0.20 seconds
Rationale: The PR interval represents the time for the electrical impulse to travel
from the sinus node through the atria, AV node, and bundle of His. A prolonged
PR interval (>0.20 seconds) indicates a first-degree AV block .
2. What is the normal duration of the QRS complex?
A) 0.04-0.10 seconds
B) 0.06-0.12 seconds
C) 0.12-0.20 seconds
D) 0.20-0.32 seconds
,Answer: B) 0.06-0.12 seconds
Rationale: The QRS complex represents ventricular depolarization. A "wide" QRS
(>0.12 seconds) indicates the electrical impulse is taking an abnormal pathway
through the ventricles (e.g., PVC or bundle branch block) .
3. What does the P wave represent on an ECG?
A) Ventricular depolarization
B) Atrial depolarization
C) Ventricular repolarization
D) AV node conduction
Answer: B) Atrial depolarization
Rationale: The P wave represents atrial depolarization (contraction) generated
when the sinus node fires and the electrical impulse spreads through the right
and left atria .
4. What does the QRS complex represent?
A) Atrial depolarization
B) Ventricular repolarization
C) Ventricular depolarization
,D) Purkinje fiber repolarization
Answer: C) Ventricular depolarization
Rationale: This is the large waveform on the ECG representing the electrical
activation of the thick ventricular muscle mass .
5. What is the length of a small square on standard EKG paper?
A) 0.02 seconds
B) 0.04 seconds
C) 0.10 seconds
D) 0.20 seconds
Answer: B) 0.04 seconds
Rationale: EKG paper runs at 25 mm/second. Each small 1 mm box equals 0.04
seconds. Five small boxes (one large box) equals 0.20 seconds .
6. How many large boxes equal 1 second on EKG paper?
A) 1
B) 3
C) 5
, D) 10
Answer: C) 5
Rationale: Each large box equals 0.20 seconds. Five large boxes (25 small boxes)
equals 1 second. This is used for calculating heart rate .
7. What is the normal QT interval duration?
A) 0.06-0.12 seconds
B) 0.12-0.20 seconds
C) 0.32-0.44 seconds
D) 0.44-0.52 seconds
Answer: C) 0.32-0.44 seconds
Rationale: The QT interval represents total time for ventricular depolarization and
repolarization. Prolonged QT intervals (often from medications) increase the risk
for Torsades de Pointes .
8. Which of the following is the correct sequence of waves in a normal ECG
complex?
A) Q-R-S-T-P
