2
The di erence between SA node block and SA node suppression is that in SA node block an electrical impulse is generated by the SA node that doesn't make the atria contract. In SA node suppression, on the other hand, the SA node doesn't generate an electrical impulse because it is reset by the electrical impulse that enters the SA node.
1.2AV nodal blocks
There are three basic types of AV nodal block:
First degree AV block
Second degree AV block
Type I second degree AV block (Mobitz I) (also known as Wenckebach block)
Type 2 second degree AV block (Mobitz II) - usually but not always below the AV node and therefore infraHisian - see below
Third degree AV block (Complete heart block)
1.3Infra-Hisian block
Infrahisian block describes block of the distal conduction system. Types of infrahisian block include:
Type 2 second degree heart block (Mobitz II)
Left bundle branch block
Left anterior fascicular block
Left posterior fascicular block
Right bundle branch block
Of these types of infrahisian block, Mobitz II heart block is considered most important because of the possible progression to complete heart block.
2References
[1]Valentin Fuster, R. Wayne Alexander, Robert A. O'Rourke, Robert Roberts, et al. (November 2000).
Hurst’s The Heart, 10th Edition. McGraw-Hill Professional Publishing. Figure 24–60b. ISBN 0-07-135695-9.
