title: Frequency and variability of ventricular premature contractions--the influence of heart rate and circadian rhythms.
mesh_terms: D000889:Anti-Arrhythmia Agents / Q000627:therapeutic use; D005117:Cardiac Complexes, Premature / Q000188:drug therapy / Q000503:physiopathology*; D002940:Circadian Rhythm / Q000187:drug effects; D006339:Heart Rate / Q000187:drug effects; D006801:Humans
chemical_list: D000889:Anti-Arrhythmia Agents