These findings suggest that ISP may decrease the content of SS in rat cardiac ganglia, and its positive inotropic and chronotropic effects on the heart can be achieved by decreasing the content of SS.

• 结果说明异丙肾上腺素可降低心内神经节中SS含量，提示，异丙肾上腺素的正性变时和变力作用可能通过降低SS的含量来实现。