retroconduction

ret·ro·grade VA con·duc·tion

conduction backward from the ventricles or from the AV node into and through the atria.

retroconduction

(rĕt″rō-kŏn-dŭk′shŭn) [″ + ″ ]
Backward conduction, i.e., a reversed flow of ions or electrical impulses, esp. used when speaking of disturbances in cardiac rhythm.