Abstract 225: Variations in Pharmacological Management of Children with Coronary Artery Aneurysms after Kawasaki Disease

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Background: The pharmacological management of coronary artery aneurysms (CAA) associated with Kawasaki disease (KD) is based on imperfect evidence, which may lead to considerable practice variation.

Methods: Pharmacological management of patients included in the North American Kawasaki Disease Registry was reviewed. The Registry included data for 621 patients with CAA after KD (280 patients with maximum CAA z-score between 2.5-5.0, 139 with z-score 5.0-10.0 and 202 with z-score >10.0) followed at 20 medical centers. Practice variation regarding acute treatment, anti-inflammatory agents, statins, beta-blockers, antiplatelet therapy and anticoagulation were assessed.

Results: Considerable practice variation existed between centers. During the acute phase, 93% of patients received at least one dose of IVIG (range: 80-100%), with 23% (range: 12-50%) receiving additional immunomodulatory treatment (22% additional IVIG, 17% steroids, 4% infliximab). Use of a 3rd course of IVIG was infrequent (2%). All centers reported using additional IVIG or steroids for IVIG-resistant patients, but only 6 centres reported any experience with infliximab (2 commonly, 4 infrequent). Routine use of non-steroidal anti-inflammatory agents was limited to 2 centres, with 4 additional sites reporting infrequent use (10% of patients). Statins (5%), beta blockers (4%) and abciximab (3%) were mostly used by a single centre and was limited to patients with giant CAAs. Aspirin was the primary antiplatelet modality for 97% of patients, clopidogrel (10% of all patients, 23% in giant CAA) was routinely prescribed to patients with giant CAAs at 6 centres, with 2 more centres reporting infrequent use and the remainder not reporting any use. For patients with giant CAA (z-score>10.0), 46% were maintained on an antiplatelet agent alone, 17% additionally were on low molecular weight heparin(LMWH), 12% on warfarin and 25% had initially received LMWH and were later switched to warfarin.

Conclusions: Given the important variations in management between centres and the poor evidence base, randomized controlled trials examining outcomes and nested in a high-quality collaborative registry may be an efficient strategy to address this gap.

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