Influence of beta-blockade on myocardial threshold in patients with pacemakers.
D000368:Aged; D005260:Female; D006321:Heart / Q000187:drug effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D011433:Propranolol / Q000008:administration & dosage / Q000494:pharmacology*
D011433:Propranolol