Sinoatrial Block

Sinoatrial block is impaired conduction of the impulse from the sinus node to the atria, causing dropped beats on ECG. It may be first-, second-, or third-degree. Clinical: asymptomatic or dizziness/syncope from bradycardia (sick sinus syndrome). Treatment: treat reversible cause (drugs/ischemia/electrolyte); pacemaker for symptomatic bradycardia/syncope; avoid AV-nodal blockers.

Common Symptoms

Asymptomatic or dizziness/syncope; dropped P waves; bradycardia/sick sinus syndrome

Causes and Pathogenesis

Degenerative/ischemic/medication effects impair sinus-node impulse conduction.

Treatment

Treat reversible cause; pacemaker for symptomatic bradycardia/syncope; avoid AV-nodal blockers

Preventive Measures

Avoid excessive sinus-node blockers; monitor.

Department to Visit

It is recommended to visit the Cardiology/EP department; an appointment can be booked on this platform before the visit.

Warm reminder: The above information is for health science reference only and cannot replace professional medical diagnosis. If you have related symptoms, please seek medical attention at a regular hospital promptly.