applications of atropine ( 2.6 mum ) with propranolol ( 3.3 mum ) did not affect the negative chronotropic effect , whereas adrenaline ( 5 mum ) reversed it.3 depolarization and shortening of the action potential duration were found in atrial muscle fibres after the application of 5-bromo salicylate ( 60-100 mum ) .
C0033497
propranolol
C1372752
negative chronotropic