Mobitz type II second-degree atrioventricular block during dobutamine stress echocardiography. True or false?

摘要

Dobutamine is a sympathomimetic drug and a structural analog of isoproterenol. Its primary mechanism is the direct stimulation of the beta 1 receptors of the sympathetic nervous system. When used for stress echocardiography, it rarely causes transient second-degree atrioventricular (AV) block (0.6-1.Wo). The development of transient complete AV block is even rarer. In this respect, Varga et al. found only 2 cases of transient complete AV block in a study of 35 103 cases of dobutamine stress echocardiography in an investigation where the incidence of second-degree AV block was not examined.