Arrhythmia Recognition: The Art of Interpretation
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Practice Rhythm Strips

Practice Rhythm Strip 4
 
Rate:Around 85 BPMPR intervals:Variable
Regularity:Irregularly irregularQRS width:Normal
P waves:PresentGrouping:None
   Morphology:VariableDropped Beats:None
   Axis:VariableRhythm:Wandering atrial pacemaker
P:QRS ratio:1:1

This ECG strip shows the classic changes of a wandering atrial pacemaker. Notice the slow, gradual transition of the P waves from upright to inverted. Longer strips show the transition occurring back and forth between the pacemakers. Notice that the QRS complexes and T waves are identical in this strip. There is no evidence of any aberrant conduction, as can sometimes occur with faster rates.

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