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R-R interval is irregular
R-R interval varies continuously
R-R interval is phasic with respiration ; increases during inspiration
P-P interval is irregular
P wave precedes each QRS complex
P wave axis may vary between 0o-90o
PR interval varies less than 0.02 sec
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Premature atrial contraction
Tachycardia-bradycardia ("sick sinus") syndrome
Wandering atrial pacemaker
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