Key result
Sinus node artery involvement in coronary artery disease was not associated with prolonged sinoatrial recovery times or sick sinus syndrome.
Why the study?
Does coronary artery disease involving the sinus node artery cause sick sinus syndrome or alter sinoatrial recovery times?
Observational (n=50)
Does coronary artery disease involving the sinus node artery cause sick sinus syndrome or alter sinoatrial recovery times?
Sick sinus syndrome is unlikely to be related to coronary artery disease of the sinus node artery, as SNA obstructions do not prolong sinoatrial recovery times.
Answers are grounded in this paper and cite their sources.
SNA involvement in CAD warrants no change in sinus node evaluation; leaves open non-ischemic mechanisms for sick sinus syndrome.
The relationship of depressed sinus node function to coronary artery disease (CAD) was evaluated. The sinus node artery (SNA) was easily identified in all of 80 unselected normal coronary arteriograms. Angiographic disease of, or significant obstruction proximal to, the SNA was seen in 21% of 80 unselected CAD patients. Heart rate and sinoatrial recovery times (SART) were obtained in 50 consecutive unmedicated patients prior to arteriography. There was no difference between the SART of 23 CAD patients free of SNA involvement (1092 msec +/- 55 sem) and 18 normals (1070 +/- 40 msec). Nine patients with SNA involvement had shorter SART (941 +/- 52 MSEC) than normals (P less than 0.05) or other CAD patients (NS). Similar results were obtained for heart rate. No patient with SNA involvement had a prolonged SART or sick sinus syndrom (SSS). six of the 50 patients studied were symptomatic with SSS. Five of these SSS patients had CAD but none had angiographic evidence of SNA involvement. Obstructions involving the SNA were common in CAD but were not associated with altered heart rate or SART. Patients with SSS exhibited no angiographic evidence of SNA involvement. Therefore, it is unlikely that SSS is related to CAD of the SNA.
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Engel et al. (1975) conducted an observational in Coronary artery disease and sick sinus syndrome (n=50). Sinus node artery (SNA) involvement vs. Normal coronary arteries or CAD without SNA involvement was evaluated on Sinoatrial recovery times (SART) (p=<0.05). Sinus node artery involvement in coronary artery disease was not associated with prolonged sinoatrial recovery times or sick sinus syndrome.
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