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sinus node dysfunction
Also see more specific term
Etiology:
- degenerative fibrosis of the sinoatrial node
- beta-blockers & parasympathomimetics (donepezil, neostigmine, pyridostigmine) are the most common reversible cause of sinus node dysfunction
Pathology:
- near-syncope, syncope, or confusion are manifestations of hypoperfusion
Clinical manifestations:
- sinus bradycardia
- lightheadedness
Complications:
- ectopic atrial bradycardia (rate <50/min)
- sinoatrial exit block
- sinus pause (>3 seconds)
- sinus node arrest
- tachycardia-bradycardia syndrome
- chronotropic incompetence
- isorhythmic dissociation
Management:
- correct reversible cause(s)
- permanent pacemaker implantation for symptomatic sinus node dysfunction not due to reversible cause
Specific
sick sinus syndrome; atrial fibrillation with bradyarrhythmia; tachycardia-bradycardia syndrome
sinoatrial exit block
sinus arrest/pause
sinus arrhythmia
sinus bradycardia
References
- Sidhu S, Marine JE.
Evaluating and managing bradycardia.
Trends Cardiovasc Med. 2020;30:265-272.
PMID: 31311698