Atrioventricular Block, Second Degree–Mobitz Type I in Cats
 
Second-degree atrioventricular block occurs when the electrical conduction within the AV node is delayed. 
 
The sinoatrial node (SA Node, or SAN), also called the sinus node, is the initiator of electrical impulses within the heart, triggering the heart to beat, or contract, by firing off electrical surges. The atria, the two upper chambers of the heart that receive  and send out blood, are prompted into action by the SA node's electrical impulse, which then activates the atrioventricular node (AV node ...read more