Basic Dysrhythmia – Relias Study Guide |
Verified Q&A | Latest 2025/2026 Edition
normal sinus rhythm correct answers heart rhythm originating in the sinoatrial node with
a rate in patients at rest of 60 to 100 beats per minute
Sinus Arrhythmia correct answers Appearance is ALMOST NORMAL:
Respiratory - Circulatory interaction
Rate INCREASES with INSPIRATION (IN=IN)
Sinus Bradycardia correct answers <60
normal sinus rhythm
Sinus Tachycardia correct answers >100 (100-150)
normal sinus rhythm
Premature Atrial Contraction (PAC) correct answers Heart Rate: Depends on underlying
rhythm
Regularity: Interrupts the regularity of underlying rhythm
P-Wave: can be flattened, notched, or unusual. May be hidden within the T wave
PRI: measures between .12-.20 seconds and can be prolonged; can be different from
other complexes
QRS: <.12 seconds
Sinus Arrest/Pause correct answers - SA node doesn't fire
- notice absence of P-wave for a complete cycle (a missed cycle)
length of pause ≠ multiple of normal rate (block)
Atrial Fibrillation (A-Fib) correct answers an irregular and often very fast heart rate
originating from abnormal conduction in the atria
Atrial Flutter correct answers irregular beating of the atria; often described as "a-flutter
with 2 to 1 block or 3 to 1 block"
Junctional Rhythm correct answers 40-60 Regular!
-impulse from AV node w/ retro/antegrade transmission
- P wave often inverted/buried/follow QRS
- slow rate
- narrow QRS (not wide like ventricular)
Junctional Tachycardia correct answers >60 bpm (ms. K; 150-250)
- KEY: will be regular (consistent)
, - AV junction produces a rapid sequence of QRS-T cycles
- p-wave often inverted/buried/follow QRS
Premature Junctional Contraction correct answers Inverted p wave or hidden p wave
PRI<0.12 or none
Normal QRS
Supraventricular Tachycardia (SVT) correct answers an abnormal heart rhythm arising
from aberrant electrical activity in the heart; originates at or above the AV node
First degree heart block correct answers atrioventricular (AV) block in which the atrial
electrical impulses are delayed by a fraction of a second before being conducted to the
ventricles
2nd degree heart block type 1 (Wenkebach) correct answers Progressively longer PR
interval until the P wave is not followed by a QPR
2nd Degree Heart Block (Mobitz II) correct answers Rare, but more serious
Sudden appearance of a nonconducted P-wave
P-waves are nl, but some aren't followed by a QRS complex
PR & RR intervals are constant
3rd degree heart block correct answers no obvious correlation between p and qrs, need
pace maker
premature ventricular contraction (PVC) correct answers a ventricular contraction
preceding the normal impulse initiated by the SA node (pacemaker)
Bigeminy PVC correct answers every other beat is a PVC
PVC couplets correct answers PVC occurring in pairs, no adequate C.O. when this
occurs
monomorphic ventricular tachycardia correct answers presents with wide QRS
complexes of a common shape.
Torsades de pointes correct answers Rate: 120 - 200 usually
P wave: Obscured by ventricular waves
QRS: Wide QRS - "Twisting of the Points"
Conduction: Ventricular only
Rhythm: Slightly irregular
Ventricular fibrillation (V-fib) correct answers abnormal heart rhythm which results in
quivering of ventricles
Idioventricular Rhythm correct answers <40
Verified Q&A | Latest 2025/2026 Edition
normal sinus rhythm correct answers heart rhythm originating in the sinoatrial node with
a rate in patients at rest of 60 to 100 beats per minute
Sinus Arrhythmia correct answers Appearance is ALMOST NORMAL:
Respiratory - Circulatory interaction
Rate INCREASES with INSPIRATION (IN=IN)
Sinus Bradycardia correct answers <60
normal sinus rhythm
Sinus Tachycardia correct answers >100 (100-150)
normal sinus rhythm
Premature Atrial Contraction (PAC) correct answers Heart Rate: Depends on underlying
rhythm
Regularity: Interrupts the regularity of underlying rhythm
P-Wave: can be flattened, notched, or unusual. May be hidden within the T wave
PRI: measures between .12-.20 seconds and can be prolonged; can be different from
other complexes
QRS: <.12 seconds
Sinus Arrest/Pause correct answers - SA node doesn't fire
- notice absence of P-wave for a complete cycle (a missed cycle)
length of pause ≠ multiple of normal rate (block)
Atrial Fibrillation (A-Fib) correct answers an irregular and often very fast heart rate
originating from abnormal conduction in the atria
Atrial Flutter correct answers irregular beating of the atria; often described as "a-flutter
with 2 to 1 block or 3 to 1 block"
Junctional Rhythm correct answers 40-60 Regular!
-impulse from AV node w/ retro/antegrade transmission
- P wave often inverted/buried/follow QRS
- slow rate
- narrow QRS (not wide like ventricular)
Junctional Tachycardia correct answers >60 bpm (ms. K; 150-250)
- KEY: will be regular (consistent)
, - AV junction produces a rapid sequence of QRS-T cycles
- p-wave often inverted/buried/follow QRS
Premature Junctional Contraction correct answers Inverted p wave or hidden p wave
PRI<0.12 or none
Normal QRS
Supraventricular Tachycardia (SVT) correct answers an abnormal heart rhythm arising
from aberrant electrical activity in the heart; originates at or above the AV node
First degree heart block correct answers atrioventricular (AV) block in which the atrial
electrical impulses are delayed by a fraction of a second before being conducted to the
ventricles
2nd degree heart block type 1 (Wenkebach) correct answers Progressively longer PR
interval until the P wave is not followed by a QPR
2nd Degree Heart Block (Mobitz II) correct answers Rare, but more serious
Sudden appearance of a nonconducted P-wave
P-waves are nl, but some aren't followed by a QRS complex
PR & RR intervals are constant
3rd degree heart block correct answers no obvious correlation between p and qrs, need
pace maker
premature ventricular contraction (PVC) correct answers a ventricular contraction
preceding the normal impulse initiated by the SA node (pacemaker)
Bigeminy PVC correct answers every other beat is a PVC
PVC couplets correct answers PVC occurring in pairs, no adequate C.O. when this
occurs
monomorphic ventricular tachycardia correct answers presents with wide QRS
complexes of a common shape.
Torsades de pointes correct answers Rate: 120 - 200 usually
P wave: Obscured by ventricular waves
QRS: Wide QRS - "Twisting of the Points"
Conduction: Ventricular only
Rhythm: Slightly irregular
Ventricular fibrillation (V-fib) correct answers abnormal heart rhythm which results in
quivering of ventricles
Idioventricular Rhythm correct answers <40
