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Collateral circulation in Kawasaki disease with coronary occlusion or severe stenosis
1Department of Pediatrics, Tokyo Women's Medical College, Daini Hospital, Japan.
Insights
Collateral circulation in Kawasaki disease is only visible with total coronary artery occlusion and does not prevent myocardial ischemia. Surgical bypass can restore normal heart function if the graft remains open.
Area of Science:
- Cardiology
- Pediatric Cardiology
- Vascular Biology
Background:
- Kawasaki disease frequently causes severe coronary artery abnormalities.
- Assessing collateral circulation is crucial for understanding myocardial perfusion in these patients.
Purpose of the Study:
- To investigate the angiographic appearance and functional significance of collateral vessels in patients with Kawasaki disease and severe coronary sequelae.
- To evaluate the impact of collateral circulation on stress-induced myocardial ischemia and the effectiveness of surgical revascularization.
Main Methods:
- Retrospective analysis of 40 patients with Kawasaki disease and significant coronary artery stenosis or occlusion.
- Coronary angiography to assess collateral vessel development.
- Treadmill stress testing and myocardial imaging to evaluate for ischemia.
- Assessment of surgical bypass graft patency and its effect on cardiac function.
Main Results:
- Collateral vessels were observed in 97% of patients with total coronary artery occlusion but were absent or poorly developed in those with severe stenosis without occlusion.
- No significant differences in stress test or imaging results were found between patients with and without visible collateral vessels.
- Surgical bypass grafting led to normalization or improvement in cardiac function when the bypass was patent.
Conclusions:
- Angiographically visible collateral circulation in Kawasaki disease requires total coronary occlusion.
- The presence of collateral circulation does not protect against stress-induced myocardial ischemia in this population.
- Successful surgical revascularization can improve cardiac function in patients with Kawasaki disease and coronary sequelae.
Abstract:
Forty patients with Kawasaki disease with severe coronary sequelae were investigated. All had at least a 90% reduction in the diameter of the major coronary artery. Collateral vessels were seen in 32 of 33 (97%) patients with total occlusion. All patients with severe stenosis but not total occlusion had no or poorly developed collateral vessels. Analysis according to the presence or absence of collateral vessels showed no significant differences in the results of treadmill stress testing and myocardial imaging between these two groups. In patients treated surgically, the abnormalities recognized by these tests were normalized or improved when the bypass was patent. These data indicate that collateral circulation in patients with Kawasaki disease cannot be seen angiographically unless there is total occlusion and the presence of collateral circulation cannot provide protection against stress-induced myocardial ischemia.