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Atrial Rhythms
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Terms in this set (8)
Atrial Fibrillation
Rhythm
Irregular
Rate
Very fast (> 350 bpm) for Atrial, but ventricular rate may be slow, normal or fast
P Wave
Absent - erratic waves are present
PR Interval
Absent
QRS
Normal but may be widened if there are conduction delays
Notes
Atrial Flutter
Rhythm
Regular or irregular
Rate
Fast (250-350 bpm) for Atrial, but ventricular rate is often slower
P Wave
Not observable, but saw-toothed flutter waves are present
PR Interval
Not measureable
QRS
Normal (0.06-0.10 sec)
Notes
Multifocal Atrial Tachycardia
Rhythm
Irregular
Rate
Fast (> 100 bpm)
P Wave
Often changing shape and size from beat to beat (at least three differing forms)
PR Interval
Variable
QRS
Normal (0.06-0.10 sec)
Notes
T wave is often distorted Also review wandering atrial pacemaker lesson
Premature Atrial Complex
Rhythm
Irregular
Rate
Usually normal but depends on underlying rhythm
P Wave
Premature, positive and shape is abnormal
PR Interval
Normal or longer
QRS
0.10 sec or less
Notes
Supraventricular Tachycardia
Rhythm
Regular
Rate
Fast (150-250 bpm)
P Wave
Merged with T wave
PR Interval
Normal (0.12 sec)
QRS
Normal (.10 sec)
Notes
PR interval can be difficult to measure
Wandering Atrial Pacemaker
Rhythm
May be irregular
Rate Normal (60-100 bpm)
P Wave
Changing shape and size from beat to beat (at least three diffferent forms)
PR Interval
Variable
QRS
Normal (0.06-0.10 sec)
Notes
T wave normal. If heart rate exceeds 100 bpm, then rhythm may be multifocal atrial tachycardia (MAP)
Wolff-Parkinson-White Syndrome
Rhythm
Regular unless atrial fibrillation present
Rate
Normal (60-100 bpm)
P Wave
Normal
PR Interval
Can be short (<0.12 sec)
QRS
Usually wide (> 0.12 sec)
Notes
Look for short PR interval and/or delta wave A delta wave (positive or negative) distorts the early part of the QRS complex
Wandering Atrial Pacemaker
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