Some dogs with SSS have a consistent, abnormally slow heartbeat (
sinus bradycardia) as the result of a low firing rate from the sinus node.
Some dogs with sick sinus syndrome have a more constant
sinus bradycardia (too slow) because the sinus node has a low firing rate.
Not exact matches
Other dogs with sick
sinus syndrome will have periods of excessive tachycardia (rapid rate) in addition to the pauses or
bradycardia.
Some of the conditions requiring a pacemaker are significant heart block (particularly if it causes fainting) and sick
sinus syndrome (
bradycardia tachycardia syndrome).