Plasminogen secreted by the eosinophils inhibits the formation of platelet thrombus within the lumen and also dissolves fibrinoid substance, which reinforces fragile endothelilal walls or edematous Interstitlum.

• 胞浆素原亦会溶解纤维组织，这现象更加强内皮细胞壁的脆弱性且使组成间质的水肿更为严重。