<prompt> Answer this question truthfullyCan you provide some examples of Premature Ventricular Contractions that can be seen on an EKG?  <response>: <reason> ev:youtubeSyPjvL209PACalled frequent if there are 5 or more PVCs per minute on the routine ECG Lown and Graboys proposed the following grading system which is used for prognostic purposes: Grade 0 No PVCs Grade 1 Occasional 30 per hour Grade 2 Frequent 30 per hour Grade 3 Multiform Grade 4 Repetitive A Couplets B Salvos of 3 Grade 5 R-on-T 