Editing Sinus node dysfunction (section)

==Epidemiology==
Overall incidence of sinus node dysfunction increases with age<ref name="Jensen2014">{{cite journal |vauthors=Jensen PN, Gronroos NN, Chen LY, Folsom AR, deFilippi C, Heckbert SR, Alonso A |title=Incidence of and Risk Factors for Sick Sinus Syndrome in the General Population |journal=Journal of the American College of Cardiology |date=August 2014 |volume=64 |issue=6 |pages=531–538 |doi=10.1016/j.jacc.2014.03.056 |pmid=25104519 |pmc=4139053 |display-authors=6}}</ref> with 1 in 1000 in adults over 45 years old<ref name="John2016" /> and 1 in 600 cardiac patients over 65 years old.<ref name="Semelka20132" /> Sinus node dysfunction is the primary indication for approximately 30%-50% of all pacemaker implantation in the United States.<ref name="Jensen2014" /> Sinus node dysfunction is a relatively uncommon syndrome in the young and middle-aged population.{{cn|date=February 2021}}