normal sinus rhythm
heart rhythm originating in the
sinoatrial node with a rate in
patients at rest of 60 to 100
beats per minute
Sinus Arrhythmia
Appearance is ALMOST
NORMAL:
Respiratory – Circulatory
interaction
Rate INCREASES with
INSPIRATION (IN=IN)
Sinus Bradycardia
<60
normal sinus rhythm
Sinus Tachycardia
>100 (100-150)
normal sinus rhythm
Premature Atrial Contraction
(PAC) 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
– 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)
an irregular and often very fast
heart rate originating from
abnormal conduction in the
atria
Atrial Flutter
irregular beating of the atria;
often described as “a-flutter
with 2 to 1 block or 3 to
1 block”
Junctional Rhythm
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
>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 Inverted p wave or hidden p
wave
PRI<0.12 or none
Normal QRS
Supraventricular Tachycardia
(SVT) an abnormal heart rhythm
arising from aberrant electrical
activity in the heart; originates
at or above the AV node
heart rhythm originating in the
sinoatrial node with a rate in
patients at rest of 60 to 100
beats per minute
Sinus Arrhythmia
Appearance is ALMOST
NORMAL:
Respiratory – Circulatory
interaction
Rate INCREASES with
INSPIRATION (IN=IN)
Sinus Bradycardia
<60
normal sinus rhythm
Sinus Tachycardia
>100 (100-150)
normal sinus rhythm
Premature Atrial Contraction
(PAC) 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
– 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)
an irregular and often very fast
heart rate originating from
abnormal conduction in the
atria
Atrial Flutter
irregular beating of the atria;
often described as “a-flutter
with 2 to 1 block or 3 to
1 block”
Junctional Rhythm
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
>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 Inverted p wave or hidden p
wave
PRI<0.12 or none
Normal QRS
Supraventricular Tachycardia
(SVT) an abnormal heart rhythm
arising from aberrant electrical
activity in the heart; originates
at or above the AV node
