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Atrial Rhythms MEHDI BAKHSHI MSN CCN ICNS
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Wandering Pacemaker Pacemaker site wanders between sinus node, atria, and AV junction. Rate is usually normal; impulses are conducted normally to the ventricles.
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Wandering Pacemaker Regularity: Slightly irregular Rate: Usually normal, 60–100 beats/minute P Wave: Morphology changes from beat to beat PRI: Less than.20 seconds; may vary QRS: Less than.12 seconds
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Wandering Pacemaker
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Premature Atrial Contraction Pacemaker is an irritable focus within the atrium that fires prematurely and produces a single ectopic beat. Impulses are conducted normally to the ventricles.
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Premature Atrial Contraction Regularity: Depends on underlying rhythm; usually regular except for PAC Rate: Usually normal; depends on underlying rhythm P Wave: P wave of early beat differs from sinus P Waves; can be flattened or notched; may be lost in preceding T wave PRI:.12–.20 seconds; can be greater than.20 seconds QRS: Less than.12 seconds
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Premature Atrial Contraction
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Atrial Tachycardia Pacemaker is a single irritable site within the atria that fires repetitively at a very high rate. Impulses are then conducted normally to the ventricles.
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Atrial Tachycardia Regularity: Regular Rate: 150–250 beats per minute P Wave: Atrial P wave; differs from sinus P wave; can be lost in preceding T wave PRI:.12–.20 seconds QRS: Less than.12 seconds
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Atrial Tachycardia
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Atrial Flutter Single irritable focus within the atria initiates rapid, repetitive impulses. AV node protects the ventricles by blocking conduction of some impulses.
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Atrial Flutter Regularity: Atrial Rhythm regular; ventricular rhythm usually regular but can be irregular if there is variable block Rate: Atrial rate 250–350 beats per minute; ventricular rate varies P Wave: Characteristic sawtooth pattern (F waves) PRI: Unable to determine QRS: Less than.12 seconds
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Atrial Flutter
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Atrial Fibrillation Many irritable sites within atria fire repetitively, causing ineffective atrial depolarization. AV node blocks most impulses, so ventricular rate is usually slower than atrial.
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Atrial Fibrillation Regularity: Grossly irregular Rate: Atrial greater than 350 beats per minute; ventricular rate varies greatly P Wave: No discernible P waves; atrial activity is referred to as fibrillatory waves (f waves) PRI: Unable to measure QRS: Less than.12 seconds
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Atrial Fibrillation
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Chapter 5 Practice Strips
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