What is the Lown system for grading premature beats in premature ventricular contractions (PVCs)?

Updated: Jan 13, 2017
  • Author: James E Keany, MD, FACEP; Chief Editor: Erik D Schraga, MD  more...
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Answer

PVCs usually are described in terms of the Lown grading system for premature beats, as follows (the higher the grade, the more serious the ectopy):

  • Grade 0 - No premature beats
  • Grade 1 - Occasional (
  • Grade 2 - Frequent (>30/hr)
  • Grade 3 - Multiform
  • Grade 4 - Repetitive (A = couplets; B = salvos of ≥3)
  • Grade 5 - R-on-T pattern
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