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Each ECG analysis begins with the detection of the QRS complex, which is the most distinguishable wave for initial investigation. Long ago we published an algorithm for ventricular beats (VB) detection in single ECG lead. The classification of normal QRS complexes is based on the slope, the amplitude and the width of the ECG waves. Other criteria recognize ventricular ectopic beats (EB) by presence of biphasic beats and separate premature EB from the already detected QRS complexes. The aim of this paper is to place the MATLAB program of our algorithm at disposal to the readers (http://www.biomed.bas.bg/bioautomation/2019/vol_23.1/files/23.1_06.zip) looking forward to more successful ECG investigations.