and all β-blockers exert their negative dromotropic effects mainly at the level of the AV node. In this report, 75% (43 of 57 patients) of patients with AV block caused by drugs had blocks at the ...

The heart predominantly contains β1-adrenoreceptors, which, along with β2, trigger positive inotropic, chronotropic, lusitropic and dromotropic effects via cAMP-dependent pathways. Adrenoceptors on ...