Study uncovers the impact of myocardial infarction on the cardiac conduction system, revealing insights into arrhythmogenesis ...

A heart block happens when these electrical impulses are blocked or delayed. “First-degree heart block will not cause any symptoms, but second- and third-degree ones are more serious.

Note the first-degree AV block, normal P-wave axis ... In adults with previously undetected congenital heart disease such as ASD, Ebstein’s anomaly, congenitally corrected TGA, or cardiac malpositions ...