the effects of lidocaine ( 2 and 5 mg/1 ) , tocainide ( 10 and 20 mg/1 ) and verapamil ( 0.5 and 1.0 mg/1 ) on action potential characteristics as well as conduction times were measured at cycle lengths of 1000 , 800 , 600 , 500 , 400 and 300 ms .
C1521970
characteristics
C1444754
lengths