Most local anaesthetics used clinically are relatively hydrophobic molecules that gain access to their blocking site on the sodium channel by diffusing into or through the cell membrane 大多数应用于临床的局麻药物都是相对疏水性的分子，可弥散通过细胞膜，作用于阻滞部位的钠通道。
2.
Fold return formation postulate to be : heart somewhere or much place are one - way block sluggish ; impulse is conducted in another way slow ; defer of cardiac muscle of yuanduan of place of block sluggish is excited ; place of block sluggish carries cardiac muscle nearly again excited 折返形成的基本条件为：心脏某处或多处单向阻滞；冲动在另一途径传导缓慢；阻滞部位远端心肌延迟激动；阻滞部位近端心肌再激动。
