1973 Volume 111 Issue 4 Pages 405-406
MnCl2 induced negative dromotropic effect on the AV node of dogs in situ. At a dose level above 10mg, a transient AV block was observed. The injection of 1-3mg of MnCl2 suppressed the acceleration of AV nodal rhythm, which was induced by administration of 1 μg of norepinephrine.