Abstract
Further evidence is presented for the new concept of concealed extra-systoles, i.e., extrasystoles whose discharge remains localised to the ectopic focus without invading the surrounding myocardium. On the basis of Rule of Bigeminy 2 types of ventricular extrasystoles may be distinguished. Extrasystoles that are not dependent upon the Rule[long dash]the extrasystoles in the form of concealed or manifest bigeminy or trigeminy. Extrasystoles that are dependent upon the Rule[long dash]the extrasystoles in haphazard distribution.

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