What is the significance of a variable coupling finding in the workup of ventricular premature complexes (VPCs)?

Updated: Nov 26, 2016
  • Author: Jatin Dave, MD, MPH; Chief Editor: Jose M Dizon, MD  more...
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Fixed coupling refers to a fixed interval between the sinus QRS complex and the VPC; this indicates reentry or a triggered focus as the possible cause. Variable coupling could be due to parasystole or multifocal ectopy.

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