EKG exam 1 Question and answers
100% correct 2026/2027
1st degree AV block - correct answer Normal sinus rhythm but PR interval is prolonged
PR interval > .20 seconds - conduction is delayed at AV node
2nd degree AV block Type 1 (Wenckebach) - correct answer More P waves than QRS
PR interval progressively increases in a cycle until P appears w/o QRS
occasional dropped beat
RR intervals not regular
2nd degree AV Block Type 2 - correct answer More P waves than QRS
PR interval is *consistent and normal*
multiple dropped beats
QRS regular width
3rd degree AV block (complete heart block) - correct answer More P waves than QRS;
Sometimes the P waves are hidden within the T wave
No pattern to PR interval, variable
R-R always regular
No atrial impulses are conducted through the AV node. Heart has regular atrial activity and regular
ventricular activity, but the activities are not coordinated with each other.
Ventricular tachycardia - correct answer Tachycardic rhythm
No P waves
*Wide* QRS
, May or may not have a pulse (one of the four pulse-less rhythms)
Atrial flutter - correct answer Regular rhythm and normal rate usually
P waves are present, but there are *extra ones*
Saw-tooth P waves
QRS normal
Sinus Bradycardia - correct answer Bradycardic rate
Regular rhythm
P waves are present for each QRS. No dropped P waves
PVC (Premature Ventricular Contraction) - correct answer R-R interval not regular (irregular rhythm)
Absent P waves
Wide QRS greater than 0.12 seconds; notched and bizarre
atrial fibrillation - correct answer Irregularly irregular rhythm
chaotic electrical activity
No obvious P waves
No PR interval
QRS normal
Premature Atrial Contractions (PAC) - correct answer Regularly irregular
P waves present for each QRS, but are early and upright, different from sinus
PR: 0.12-0.20 seconds; different from sinus
100% correct 2026/2027
1st degree AV block - correct answer Normal sinus rhythm but PR interval is prolonged
PR interval > .20 seconds - conduction is delayed at AV node
2nd degree AV block Type 1 (Wenckebach) - correct answer More P waves than QRS
PR interval progressively increases in a cycle until P appears w/o QRS
occasional dropped beat
RR intervals not regular
2nd degree AV Block Type 2 - correct answer More P waves than QRS
PR interval is *consistent and normal*
multiple dropped beats
QRS regular width
3rd degree AV block (complete heart block) - correct answer More P waves than QRS;
Sometimes the P waves are hidden within the T wave
No pattern to PR interval, variable
R-R always regular
No atrial impulses are conducted through the AV node. Heart has regular atrial activity and regular
ventricular activity, but the activities are not coordinated with each other.
Ventricular tachycardia - correct answer Tachycardic rhythm
No P waves
*Wide* QRS
, May or may not have a pulse (one of the four pulse-less rhythms)
Atrial flutter - correct answer Regular rhythm and normal rate usually
P waves are present, but there are *extra ones*
Saw-tooth P waves
QRS normal
Sinus Bradycardia - correct answer Bradycardic rate
Regular rhythm
P waves are present for each QRS. No dropped P waves
PVC (Premature Ventricular Contraction) - correct answer R-R interval not regular (irregular rhythm)
Absent P waves
Wide QRS greater than 0.12 seconds; notched and bizarre
atrial fibrillation - correct answer Irregularly irregular rhythm
chaotic electrical activity
No obvious P waves
No PR interval
QRS normal
Premature Atrial Contractions (PAC) - correct answer Regularly irregular
P waves present for each QRS, but are early and upright, different from sinus
PR: 0.12-0.20 seconds; different from sinus
