Modified van der Pol equation can be used to describe the activity of elements of electrical conduction system of human heart: sinoatrial node (SA), atrioventicular node (AV), and His Purkinje system. This model has a number of interesting properties allowing do reconstruct phenomena observed in physiological experiments as well as in Holter
electrocardiographic recordings. The aim of the presented work was totake into consideration the influence of feedback and delay which occur in normal heart action mode as well as in pathological modes. Usage of certain values for feedback and delay parameters in this model allows to simulate the heart action in situation when an accessory conducting
pathway is present (Wolff - Parkinson - White syndrome).
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