Practice 35 Questions and Answers
2026 | Updated Revision Pack | Grade
A+
• Normal sinus rhythm. CORRECT ANSWER: Regular
Rate: 60-100
P Wave: Present, upright
PR Interval: 0.12-0.20 sec
QRS: <0.12 sec
• Sinus Bradycardia. CORRECT ANSWER: Regular
Rate: <60
P Wave: Present, upright
PR Interval: 0.12-0.20 sec
QRS: <0.12 sec
• Sinus Tachycardia. CORRECT ANSWER: Regular
Rate: 100-150
P Wave: Present, upright
PR Interval: 0.12-0.20 sec
QRS: <0.12 sec
, • Premature Atrial Contraction. CORRECT ANSWER: IRREGULAR
Rate: depends on underlying rhythm
P wave: Present or hidden in T wave
PR Interval: 0.12-0.20 sec
QRS: <0.12 sec
• Atrial Fibrillation. CORRECT ANSWER: IRREGULAR
Atrial rate: UNMEASURABLE
Ventricular rate: variable
P wave: unable to see
PR Interval: N/A
QRS: <0.12 sec
• A fib RVR. CORRECT ANSWER: IRREGULAR
Ventricular rate: 100-175
P wave: unable to see
PR Interval: N/A
QRS <0.12 sec
• Atrial Flutter. CORRECT ANSWER: Usually REGULAR can be irregular
Atrial rate: 250-350
Ventricular rate: variable BUT < atrial rate