11. From 1924 to 1928, he published his famous key papers on AV dissociation and heart block . 12. Type 1 second-degree heart block is considered a more benign entity than type 2 second-degree heart block . 13. Type 1 second-degree heart block is considered a more benign entity than type 2 second-degree heart block. 14. Atropine is also useful in treating third-degree heart block with a low Purkinje or ventricular escape rhythm. 15. Digoxin toxicity includes heart block . [ Talk ] 08 : 39, 19 March 2010 ( UTC) 16. Bradycardia can be caused by heart blocks . 17. Hyperkalemia in those with previous cardiac disease and Lyme disease can also result in third-degree heart block . 18. Individuals with atrial septal defects may have a prolonged PR interval ( a first-degree heart block ). 19. Adams-Stokes syndrome is a cardiac syncope that occurs with seizures caused by complete or incomplete heart block . 20. In 1908, Arthur MacNalty and Thomas Lewis ( cardiologist ) teamed to employ electrocardiography to diagnose Heart block .