If, for some reason, the conduction of electrical impulses along AV bundle is blocked, there will be a loss of coordination between the

Without appropriate conduction through the AV node and AV bundle, the SA node cannot act to control the heart rate. Heartbeat may still be maintained by autorhythmic fibres in the ventricles (the AV bundle, a bundle branch, or Purkinje fibres). However, the pacing rate of ventricles is slow (20–35 bpm) compared to that of atria. So, there is loss of coordination of the atria and the ventricles.