The afterdepolarizations were recorded in 6 of 12 dogs. EAD-induced triggered activity was observed in 2 dogs (33.3% ) ,and DAD-induced in 1 dog (16.7%).

• 12只实验犬有6只(50%25)记录到后除极；直接触发IA的犬EAD有2只(33.；3%25)、DAD有1只(16