Controversies in diagnosis and management of Kawasaki disease

Table 4 Coronary artery abnormalities severity classification in different guidelines

Criteria	Description
JMH criteria[14]	Aneurysm definition
	< 5 yr - ID > 3 mm
	≥ 5 yr - ID > 4 mm
Updated JMH (2008)[93]	Small aneurysm (dilatation with ID < 4 mm or if child is ≥ 5 yr of age, ID ≤ 1.5 times that of an adjacent segment)
	Medium aneurysm (dilatation with ID > 4 mm but ≤ 8 mm or if child is ≥ 5 yr of age, ID 1.5 to 4 times that of an adjacent segment)
	Large aneurysm (dilatation with ID > 8 mm or if child is ≥ 5 yr of age, ID > 4 times that of an adjacent segment)
AHA 2004 criteria[1]	Aneurysm ID z score > 2.5 (as per body surface area adjusted z scores)
	Small: < 5 mm
	Medium: 5 to 8 mm
	Giant aneurysm: > 8 mm based on absolute diameter
AHA 2017 criteria (Manlhiot et al)[13,68]	No involvement (Z score < 2)
	Dilation only (Z score 2 to < 2.5; or if initially < 2, a decrease in Z score during follow-up ≥ 1 thereby suggesting that coronary artery was dilated during acute stage though diameter was within normal standards and the diameter has regressed on follow-up)
	Small aneurysm (Z score ≥ 2.5 to < 5)
	Medium aneurysm (Z score ≥ 5 to < 10, and absolute dimension < 8 mm)
	Large or giant aneurysm (≥ 10, or absolute dimension ≥ 8 mm)

ID: Internal diameter; AHA: American Heart Association; JMH: Japanese Ministry of Health.