Key result
Proximal sinus node artery occlusion linked to ~260 ms longer corrected sinus node recovery time vs distal.
Why the study?
The role of the sinus node artery and the clinical course in postmyocardial infarction sinus node dysfunction needed to be determined.
Observational (n=27)
Answers are grounded in this paper and cite their sources.
Supports short-term safety of proximal sinus node artery procedures; leaves open arrhythmia risk in longer-term observational studies.
To determine the role of the sinus node artery and the clinical course in postmyocardial infarction sinus node dysfunction, 27 patients with acute inferior myocardial infarction and single-vessel coronary artery disease were studied. In 13 patients (group 1) the infarct-related coronary artery was occluded proximally and in 14 (group 2) distally to the site of origin of the sinus node artery. At electrophysiology, performed 10 +/- 3 days from the acute event, basal and intrinsic heart rate were lower in group 1 compared to group 2 patients (54 +/- 4.8 vs. 69 +/- 7 beats/min, p = 0.001, and 66 +/- 7 vs. 76 +/- 8 beats/min, p = 0.006, respectively) while basal and intrinsic corrected sinus node recovery times were prolonged in group 1 compared to group 2 patients (585 +/- 49.3 vs. 324 +/- 61.3 ms, p = 0.0001, and 601 +/- 39.1 vs. 335 +/- 73 ms, p = 0.0001). During a 6-month follow-up no episodes of dizziness, syncope or angina were reported. Moreover, at the end of follow-up resting heart rate (70 +/- 11 vs. 73 +/- 7 beats/min, nonsignificant), maximal exercise heart rate (166 +/- 19 vs. 170 +/- 23 beats/min, nonsignificant), and exercise time (491 +/- 120 vs. 480 +/- 155 s, nonsignificant) were similar between the two groups and no exercise-induced ischemic ST segment depression was observed. Sinus node dysfunction in patients with inferior myocardial infarction and one-vessel disease is related to the occlusion of the infarct-related coronary artery proximal to the site of origin of the sinus node artery and is not associated with increased cardiovascular morbidity in the first 6 months from the acute event.
No takes yet. Share an insight, caveat, or question.
Kyriakidis et al. (2008) conducted an observational in Acute inferior myocardial infarction with single-vessel coronary artery disease (n=27). Infarct-related coronary artery occlusion proximal to the sinus node artery origin vs. Infarct-related coronary artery occlusion distal to the sinus node artery origin was evaluated on Basal corrected sinus node recovery time (ms) at 10 +/- 3 days (p=0.0001). Proximal occlusion to the sinus node artery prolonged basal corrected sinus node recovery time compared to distal occlusion (585 vs 324 ms, p=0.0001) without increasing 6-month morbidity.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: