First degree: Electrical impulses slow down, but there may be no noticeable symptoms or required treatment. It’s the least severe type of heart block. Second degree: With second-degree heart ...

Note: There is a 1:1 ratio between P waves and QRS complexes, unlike 2nd degree AV nodal block and 3rd degree AV nodal block. In general, a first-degree AV block is a benign finding that does not ...

Unlike first-degree AV nodal block, a 1:1 P-wave-to-QRS-complex ratio is not maintained. Second-degree type I AV block is specifically characterized by an increasing delay of AV nodal conduction ...