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A clinical angiographic study of the arterial blood supply to the sinus node
M Kyriakidis1, G Vyssoulis, J Barbetseas
1Cardiac Department, Hippokration Hospital, University of Athens, Greece.
Insights
The sinus node artery, crucial for heart rhythm, is typically free of disease. However, severe blockages in the left circumflex artery can rarely affect sinus node function.
Area of Science:
- Cardiovascular Anatomy
- Interventional Cardiology
Background:
- The arterial blood supply to the sinus node is critical for maintaining normal heart rhythm.
- Understanding the anatomical variations and potential pathologies of the sinus node artery is important for cardiac procedures.
Purpose of the Study:
- To investigate the origin and characteristics of the arterial blood supply to the sinus node area.
- To assess the prevalence of atheroma in the sinus node artery and its relationship with coronary artery disease.
Main Methods:
- Coronary arteriography was performed on 309 consecutive patients.
- Detailed analysis of the sinus node artery's origin and course was conducted.
- Patients with a history of myocardial infarction were specifically evaluated.
Main Results:
- In most patients (307/309), the sinus node arteries were free of atheroma.
- The sinus node artery originated from the right coronary artery in 182 patients and the left circumflex artery in 119.
- Two patients with temporary sinus node dysfunction had the sinus node artery arising from a stenotic left circumflex artery.
Conclusions:
- The sinus node artery is generally spared from atherosclerosis, even in patients with significant coronary artery disease.
- Severe stenosis in the left circumflex coronary artery may rarely be associated with sinus node dysfunction due to its arterial supply.
Abstract:
We studied the arterial blood supply to the sinus node area in 309 consecutive patients undergoing coronary arteriography. Seventy-nine had had a previous myocardial infarction. In two who developed temporary sinus node dysfunction, the sinus node artery arose from the distal portion of a severely stenotic left circumflex coronary artery, but in 307 of the 309 patients the sinus node arteries themselves were free of atheroma. The sinus node artery arose from the right coronary artery in 182 patients, from the proximal 3 cm in 179, near the origin of the acute marginal in one, and left of the crux in two. In 119 patients it arose from the left circumflex coronary artery, proximally in 87, and in 32 from anywhere throughout its length, running posteriorly as the posterior sinus node artery. Finally, eight patients had two sinus node arteries, one arising from the right coronary artery and one from the left circumflex.