title: The R-R interval histogram.
mesh_terms: D001145:Arrhythmias, Cardiac / Q000175:diagnosis; D004562:Electrocardiography; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D008297:Male; D008991:Monitoring, Physiologic; D010096:Oxprenolol / Q000494:pharmacology; D013223:Statistics as Topic
chemical_list: D010096:Oxprenolol