types of bradycardia
There are two basic types of bradycardia: 1  Sick sinus syndrome occurs when the sinus node (the heart's own pacemaker) fails and does not reliably trigger heartbeats. 2  Heart block is a complete or partial interruption of the electrical impulses on their way to the ventricles and results in a slow, unreliable heartbeat.
In this Article. If your doctor says you or a loved one has bradycardia, a resting heart beat that's less than 60 beats per minute, it's only part of the diagnosis. Your doctor will also want to figure out which type it is. She may talk to you about these kinds: sinus bradycardia, sick sinus syndrome, and heart block.