Editing Sinus node dysfunction (section)

=== Electrocardiogram ===
The primary 12-lead electrocardiogram (ECG) finding in sinus node dysfunction is inappropriate [[sinus bradycardia]].<ref name="Deponti2018">{{cite journal |vauthors=De Ponti R, Marazzato J, Bagliani G, Leonelli FM, Padeletti L |title=Sick Sinus Syndrome |journal=Cardiac Electrophysiology Clinics |date=June 2018 |volume=10 |issue=2 |pages=183–195 |doi=10.1016/j.ccep.2018.02.002 |pmid=29784479 |s2cid=29154542 }}</ref> Sinus node dysfunction can also present with sudden [[Sinoatrial arrest|sinus arrest]] with or without [[Junctional escape beat|junctional escape]], [[sinoatrial block]], prolonged asystolic period followed by tachycardias, or tachycardia-bradycardia syndrome presenting as various atrial arrhythmias such as [[atrial fibrillation]], [[Atrial flutter|flutter]], [[Sinus tachycardia|tachycardia]], or [[paroxysmal supraventricular tachycardia]].<ref name="Deponti2018" /><ref name="Semelka20132" />