Appraisal of sinus node artery disease

Area of Science:

• Cardiology
• Vascular Medicine
• Electrophysiology

Background:

• Coronary artery disease (CAD) is prevalent and can affect various cardiac structures.
• The sinus node artery (SNA) supplies blood to the heart's natural pacemaker.
• The relationship between SNA disease and depressed sinus node function, such as sick sinus syndrome (SSS), requires clarification.

Purpose of the Study:

• To investigate the association between coronary artery disease (CAD) affecting the sinus node artery (SNA) and sinus node dysfunction.
• To determine if obstructions in the SNA are linked to sick sinus syndrome (SSS).

Main Methods:

• Coronary arteriography was performed on 80 patients to assess the SNA.
• Sinoatrial recovery times (SART) and heart rate were measured in 50 unmedicated patients before arteriography.
• Patients were categorized based on the presence and location of CAD and SNA involvement.

Main Results:

• SNA disease was found in 21% of CAD patients.
• Patients with SNA involvement showed shorter SART compared to normals (P < 0.05), but no prolonged SART or SSS.
• Six patients had symptomatic SSS; five had CAD, but none had angiographic evidence of SNA involvement.

Conclusions:

• Obstructions in the SNA are common in patients with CAD.
• SNA involvement is not associated with prolonged SART or the development of sick sinus syndrome (SSS).
• The findings suggest that sick sinus syndrome is unlikely to be related to coronary artery disease of the sinus node artery.