The QRS Complex: Normal Activation of the Ventricles

Giuseppe Bagliani, Roberto De Ponti, Carola Gianni, Luigi Padeletti

Research output: Contribution to journalReview articlepeer-review


The ventricular conduction system starts below the His bundle, where it bifurcates into the right and left bundle branches that taper out to the subendocardial Purkinje network, which activates the ventricular myocardium. This system is responsible for the synchronized and almost simultaneous activation of both ventricles. On the surface electrocardiogram, the ventricular conduction system lies in the terminal portion of the PR interval, whereas the QRS complex composed of the electrical currents originating from ventricular depolarization. This article reviews the main electroanatomic features of the ventricular conduction system and the effects of its delay on the QRS.

Original languageEnglish
Pages (from-to)453-460
Number of pages8
JournalCardiac Electrophysiology Clinics
Issue number3
Publication statusPublished - Sep 1 2017


  • Ashman phenomenon
  • Bundle branch block
  • QRS complex
  • Ventricular conduction system

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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