since the system enables only semiquantitative delineation of ventricular arrhythmias whose absolute number , however , within a given observation period appears to be of prognostic relevance and , additionally , since the lown system is encumbered by the fact that classification is based only on the most severe arrhythmia with subsequent loss of information regarding concurrent arrhythmias of lesser severity , bigger and his associates , in 1978 , suggested a modification to provide quantification of all ventricular premature beats .
C0085612
ventricular arrhythmias
C0003811
arrhythmias