Editing Sinus node dysfunction (section)

=== Clinical diagnosis ===
Diagnosing sinus node dysfunction requires clinical symptoms as well as ECG abnormalities. If ECG findings cannot be identified, prolonged cardiac monitoring should be pursued either with a [[Holter monitor]] in an outpatient setting or telemetry while inpatient, due to the transient nature of abnormal ECG findings.<ref name="Semelka20132" /> If Holter or telemetry monitoring fails to identify ECG changes and suspicion of sinus node dysfunction remains high due to severe symptoms or episodes of syncope, [[implantable loop recorder]]s should be considered for extended monitoring up to 24 months.<ref name="Deponti2018" />

[[Exercise stress test]]s can be utilized to identify intrinsic causes of sinus node dysfunction. [[Tilt table test]]s can be used to discriminate bradycardia caused by dysfunction of the [[autonomic nervous system]].<ref name="Semelka20132" /><ref name="Deponti2018" />