Objective:To investigate the effects of desensitization and rebound to adenosine(Ado)on action potential duration(APD)and contractility in guinea-pig atrial cells.Methods:Electrical activity was I min (P<0.05) and 5min (P<0.05)respetively.The desensitization of contractility of 10μmol·L\+\{-1\}Ado was recorded using standard intracellular mcroelectrode technique and contractility was recorded using force transducer.We studied the effects of adenosine on the action potential and desensitization of contractil...