Flashcards in Atrial Rhythms Deck (42)
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When are atrial rhythm caused?
When the atrial rate becomes faster than the sinus rate
1
How is the morphology of atrial arrhythmia's P-wave (5)
Flattened
Notched
Peaked
Sawtoothed
Diphasic
2
What does diphasic mean?
There is an upward deflection and then dips below the isoelectric line
3
When is the wandering pacemaker caused?
When the pacemaker role switches from beat to beat from the SA node to the atria and back again
4
Wandering pacemaker
Regularity
Slightly irregular
5
Wandering pacemaker
Rate
60-100
Not more than 150
6
Wandering pacemaker
P wave morhphology
Morphology changes from one complex to the next
7
Wandering pacemaker
PRI time
Less than .20
Varies
8
Wandering pacemaker
QRS time
Less than .12 second
9
What is an ectopic beat?
A single beat that arises from a focus outside the SA node
10
When does an ectopic beat initiate?
When a site somewhere becomes irritable and overrides the SA node for a single beat
11
An early or premature ectopic beat indicates what?
Irritability
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An ectopic beat that is preceded by a prolonged R-R cycle is what?
Escape beat
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What is an atrial ectopic caused by irritability called?
Premature Atrial complex (PAC)
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Premature Atrial Complex
Regularity
Depends on underlying rhythm
15
Premature Atrial Complex
Rate
Depends on underlying rhythm
16
Premature Atrial Complex
P wave morphology (3)
Flattened
Notched
Lost in preceding t wave
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Premature Atrial Complex
PRI
.12-.20
Can exceed .20
18
Premature Atrial Complex
QRS
Less than .12
19
What is atrial tachycardia?
When a single focus in the atria become so irritable it overrides the SA node for the entire rhythm
20
Atrial tachycardia
Regularity
Regular
21
Atrial tachycardia
Rate
150-250
22
Atrial tachycardia
P wave morphology
Atrial p waves (flattened, notched, diphasic)
Can be lost in t wave
23
Atrial tachycardia
PRI time
.12-.20
24
Atrial tachycardia
QRS time
Less than .12
25
What is atrial flutter?
When the atrial become so irritable that they fire faster than 250 bpm
26
What is a variable block?
When the AV node becomes very erratic about conducting impulses the ratio between F waves and QRS complexes can vary which creates and irregular RRI
27
Atrial flutter
Regularity
Atrial rhythm is regular
Ventricle rhythm usually is regular unless there's a variable block
28
Atrial flutter
Rate
250-350
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