Platelet Count Variation and Risk for Coronary Artery Abnormalities in Kawasaki Disease

Area of Science:

• Pediatrics
• Immunology
• Cardiology

Background:

• Platelet count is a potential biomarker for coronary artery abnormalities (CAAs) in Kawasaki disease (KD).
• Previous research on the association between platelet count and CAAs in KD patients has yielded inconsistent results.
• This study investigates the controversial association using a large-scale dataset.

Purpose of the Study:

• To clarify the association between platelet count and the development of coronary artery abnormalities (CAAs) in Kawasaki disease (KD) patients.
• To analyze platelet count trends in relation to intravenous immunoglobulin (IVIG) responsiveness and illness duration.
• To identify specific platelet count patterns indicative of increased CAA risk.

Main Methods:

• A retrospective cohort study of 25,448 KD patients from Japan (2015-2016).
• Analysis of platelet count dynamics (lowest and highest values) based on IVIG responsiveness and illness days.
• Multivariate logistic regression to assess the association between platelet count and CAAs, adjusting for confounding factors.

Main Results:

• Platelet counts decreased post-admission, reaching a nadir at 6-7 days, and peaked after 10 days.
• IVIG non-responders showed lower minimum and higher maximum platelet counts compared to responders.
• Abnormally high platelet counts at admission ( >450 × 10/L) were linked to higher CAA risk (aOR 1.46-1.50).
• Low platelet counts after hospitalization (<150 × 10/L) in IVIG non-responders significantly increased CAA risk (aOR 2.27).

Conclusions:

• Platelet count variability by illness day and IVIG responsiveness can explain previous inconsistent findings.
• Abnormally high platelet counts upon admission or low counts post-hospitalization are associated with increased risk of CAAs in KD patients.
• These findings highlight the importance of monitoring platelet counts for predicting CAA development in KD.