Intermittent Intraventricular Blocks

  • Paolo Alboni
Part of the Developments in Cardiovascular Medicine book series (DICM, volume 12)


Intraventricular conduction disturbances (IVCD) in most cases are permanent. At times they persist for a variable period, generally secondary to acute affections and independent of cardiac rate, and then disappear. Such a type of IVCD is therefore defined as transient. The appearance and the disappearance of IVCD may also occur from one beat to another, usually in relation to changes in cardiac rate. In these cases the IVCD is defined as intermittent. If the aberrancy occurs during very early beats in relation to physiologic dishomogeneous refractoriness of the main intraventricular pathways it is defined as functional. Considering the longest duration of the His-Purkinje system (HPS) recovery time is approximately 400 msec [1, 2] (Figure 1), an IVCD which appears after longer cardiac cycles should be considered pathologic.


Left Bundle Branch Block Purkinje Fiber Right Bundle Branch Block Effective Refractory Period Right Bundle Branch Block 
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Copyright information

© Martinus Nijhoff Publishers, The Hague 1981

Authors and Affiliations

  • Paolo Alboni
    • 1
  1. 1.Electrophysiology Section, Division of CardiologyArcispedale S. AnnaFerraraItaly

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