# Vasa vasorum enhancement on optical coherence tomography in Kawasaki disease

## TL;DR

This study explores how vasa vasorum (small blood vessels) in coronary arteries relate to intimal thickening and aneurysm regression in Kawasaki disease using optical coherence tomography.

## Contribution

The study reveals a novel link between vasa vasorum enhancement and coronary artery healing in Kawasaki disease.

## Key findings

- Intimal thickening is significantly more severe in groups with coronary artery aneurysms.
- The number of vasa vasorum correlates strongly with intimal thickness in coronary arteries.
- Vasa vasorum enhancement is associated with the regression of coronary artery lesions in Kawasaki disease.

## Abstract

Patients with Kawasaki disease (KD) prone to develop coronary artery aneurysm (CAA) with unknown etiology. We aimed to disclose the relationship between vasa vasorum (VV) and intimal thickening using optical coherence tomography (OCT) in KD.

Forty-three coronary artery branches of 21 patients with KD were examined by OCT. The coronary arteries were classified into three groups: the CAA group (n = 9) in which CAAs remained since the acute phase, the regressed group (n = 16) in which CAAs were regressed, and the no CAA group (n = 18). The number and distribution of VV, and intimal thickening in coronary arteries were evaluated on OCT.

Intimal thickening was significantly more severe in the CAA and regressed groups than in the no CAA group (median: 481, 474, and 218 μm, p = 0.001 and p < 0.001, respectively). The number of VV in the regressed group was significantly higher than that in the CAA and no CAA groups. The numbers of adventitial VV and internal VV were positively correlated with the intimal thickness (R = 0.64, p < 0.001; R = 0.62, p < 0.001, respectively). In the no CAA group, no internal VV were observed.

VV enhances according to intimal thickening, suggesting that VV may have some link to the healing process, such as CAA regression and intimal thickening.

Kawasaki disease (KD) is a vasculitis syndrome developing coronary artery aneurysm, however its etiology still remains unclear. Coronary artery imaging using optical coherence tomography (OCT) can reveal coronary arterial wall pathology, however OCT studies are limited in patients with KD.Using OCT, we disclosed the closed relationship between vasa vasorum enhancement and regressed coronary arterial lesions.Vasa vasorum enhancement is involved in the pathomechanism of the convalescent phase of KD.

Kawasaki disease (KD) is a vasculitis syndrome developing coronary artery aneurysm, however its etiology still remains unclear. Coronary artery imaging using optical coherence tomography (OCT) can reveal coronary arterial wall pathology, however OCT studies are limited in patients with KD.

Using OCT, we disclosed the closed relationship between vasa vasorum enhancement and regressed coronary arterial lesions.

Vasa vasorum enhancement is involved in the pathomechanism of the convalescent phase of KD.