What is the role of the SA artery in sinus node dysfunction?

Updated: Nov 30, 2018
  • Author: Bharat K Kantharia, MD, FRCP, FAHA, FACC, FESC, FHRS; Chief Editor: Mikhael F El-Chami, MD  more...
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Answer

The SN is perfused by branches of the right coronary artery in 55-60% of cases, and by the left circumflex artery in the remaining 40-45%. Stenosis of the SA nodal artery may occur due to atherosclerosis or inflammatory processes, resulting in ischemia; the latter may also occur with embolic events. Approximately 5% of patients with myocardial infarction (MI) (usually inferior wall MI) show SND that tends to be reversible. [15]


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