Arrhythmia Recognition: The Art of Interpretation
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Practice Rhythm Strips

Practice Rhythm Strip 13
Rate:About 35 BPMPR intervals:Constant
Regularity:RegularQRS width:Narrow
P waves:NormalGrouping:Present
   Morphology:NormalDropped Beats:Present
   Axis:NormalRhythm:2:1 or untypable second-degree AVB
P:QRS ratio:2:1

This strip shows a strip with 2:1 block and a ventricular rate of 35 BPM. The PR interval is normal and consistent when it conducts. This could be compatible with either Mobitz I or Mobitz II. Based on this strip, the diagnosis can only be 2:1 AV block.

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