Pathological Alterations of Coronary Arteries Late After Kawasaki Disease: An Optical Coherence Tomography Study.

Background: The long-term impact of Kawasaki disease on coronary arteries in vivo is unclear.

Objectives: The purpose of this study was to investigate coronary arteries in the late convalescent phase, we followed patients with Kawasaki disease who developed coronary artery aneurysms (CAAs).

Methods: We followed 24 patients and used optical coherence tomography at a median of 16.6 years after the onset of Kawasaki disease.

Results: Of 72 coronary arteries, optical coherence tomography was performed on 61 arteries: 17 with a persistent CAA, 29 with a regressed CAA, and 15 without a CAA. Between-group comparison was performed by chi-square or Fisher's exact test, and intimal thickening (17 vs 29 vs 15, all 100%,  = NA) and medial disruption (17 [100%] vs 29 [100%] vs 14 [93%],  = 0.25) were commonly observed in the investigated arteries. Advanced features of atherosclerosis were more frequently seen in arteries with persistent CAAs than in those with regressed CAAs and in those without CAAs: calcification (12 [71%] vs 5 [17%] vs 1 [7%],  < 0.001), microvessels (12 [71%] vs 10 [35%] vs 4 [27%],  = 0.020), cholesterol crystals (6 [35%] vs 2 [7%] vs 0 [0%],  = 0.009), macrophage accumulation (11 [65%] vs 4 [14%] vs 4 [27%],  = 0.002), and layered plaque (8 [47%] vs 11 [38%] vs 0 [0%],  = 0.004).

Conclusions: Long after onset of Kawasaki disease, all arteries showed pathological changes. Arteries with persistent CAAs had more advanced features of atherosclerosis than those with regressed CAAs and those without CAAs.