Relias Dysrhythmia Basic A
COMPLETE QUESTIONS AND
CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) ALREADY
GRADED A+
1. Normal Sinus Rhythm (NSR)
CORRECT ANSWERS
Rhythm: Regular
Rate: 60–100 beats/min
P Wave: Present, upright
PR Interval: 0.12–0.20 seconds
QRS Complex: < 0.12 seconds
Key Point
• Normal rhythm originating from the SA node.
• Every P wave should be followed by a QRS complex.
2. Sinus Bradycardia
CORRECT ANSWERS
Rhythm: Regular
Rate: <60 beats/min
P Wave: Present, upright
PR Interval: 0.12–0.20 seconds
QRS Complex: <0.12 seconds
,Key Point
• Slow rhythm originating from the SA node.
• Can occur normally in athletes, sleep, or with medications such as beta-blockers.
3. Sinus Tachycardia
CORRECT ANSWERS
Rhythm: Regular
Rate: 100–150 beats/min
P Wave: Present, upright
PR Interval: 0.12–0.20 seconds
QRS Complex: <0.12 seconds
Key Point
• Fast rhythm from the SA node.
• Common causes:
o Exercise
o Fever
o Pain
o Anxiety
o Hypovolemia
4. Premature Atrial Contraction (PAC)
CORRECT ANSWERS
Rhythm: Irregular
Rate: Depends on underlying rhythm
P Wave: Present or hidden in T wave
PR Interval: 0.12–0.20 seconds
, QRS Complex: <0.12 seconds
Key Point
• An early electrical impulse starts in the atria.
• Usually harmless but may indicate atrial irritation.
5. Atrial Fibrillation (A-Fib)
CORRECT ANSWERS
Rhythm: Irregularly irregular
Atrial Rate: Unmeasurable
Ventricular Rate: Variable
P Wave: Unable to see
PR Interval: N/A
QRS Complex: <0.12 seconds
Key Point
• Atria quiver instead of contracting.
• No organized P waves.
• Increased risk of blood clot formation and stroke.
Memory Trick
"A-Fib = Absolutely no P waves."
6. Atrial Fibrillation with Rapid Ventricular Response (A-Fib RVR)
CORRECT ANSWERS
Rhythm: Irregular
Ventricular Rate: 100–175 beats/min
P Wave: Unable to see
PR Interval: N/A
COMPLETE QUESTIONS AND
CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) ALREADY
GRADED A+
1. Normal Sinus Rhythm (NSR)
CORRECT ANSWERS
Rhythm: Regular
Rate: 60–100 beats/min
P Wave: Present, upright
PR Interval: 0.12–0.20 seconds
QRS Complex: < 0.12 seconds
Key Point
• Normal rhythm originating from the SA node.
• Every P wave should be followed by a QRS complex.
2. Sinus Bradycardia
CORRECT ANSWERS
Rhythm: Regular
Rate: <60 beats/min
P Wave: Present, upright
PR Interval: 0.12–0.20 seconds
QRS Complex: <0.12 seconds
,Key Point
• Slow rhythm originating from the SA node.
• Can occur normally in athletes, sleep, or with medications such as beta-blockers.
3. Sinus Tachycardia
CORRECT ANSWERS
Rhythm: Regular
Rate: 100–150 beats/min
P Wave: Present, upright
PR Interval: 0.12–0.20 seconds
QRS Complex: <0.12 seconds
Key Point
• Fast rhythm from the SA node.
• Common causes:
o Exercise
o Fever
o Pain
o Anxiety
o Hypovolemia
4. Premature Atrial Contraction (PAC)
CORRECT ANSWERS
Rhythm: Irregular
Rate: Depends on underlying rhythm
P Wave: Present or hidden in T wave
PR Interval: 0.12–0.20 seconds
, QRS Complex: <0.12 seconds
Key Point
• An early electrical impulse starts in the atria.
• Usually harmless but may indicate atrial irritation.
5. Atrial Fibrillation (A-Fib)
CORRECT ANSWERS
Rhythm: Irregularly irregular
Atrial Rate: Unmeasurable
Ventricular Rate: Variable
P Wave: Unable to see
PR Interval: N/A
QRS Complex: <0.12 seconds
Key Point
• Atria quiver instead of contracting.
• No organized P waves.
• Increased risk of blood clot formation and stroke.
Memory Trick
"A-Fib = Absolutely no P waves."
6. Atrial Fibrillation with Rapid Ventricular Response (A-Fib RVR)
CORRECT ANSWERS
Rhythm: Irregular
Ventricular Rate: 100–175 beats/min
P Wave: Unable to see
PR Interval: N/A
