Quantitative Assessment of Myocardial Edema by MR T2 Mapping in Children With Kawasaki Disease

Abstract

BackgroundFew studies assessed myocardial inflammation using Cardiovascular Magnetic Resonance Imaging in Kawasaki disease (KD) patients.PurposeTo quantify myocardial edema in KD patients using T2 mapping and explore the independent predictors of T2 values.Study TypeProspective.SubjectsNinety KD patients including 40 in acute phase (26 males, 65.0%) and 50 in chronic phase (34 males, 68.0%). Thirty‐one healthy volunteers (21 males, 70.0%).Field Strength/Sequence3.0 T T2‐weighted Turbo Spin Echo‐Short Time of Inversion Recovery sequence, True fast imaging with steady precession flash sequence and fast low‐angle shot 3D spoiled gradient echo sequence.AssessmentT2 values were compared among KD groups and controls.Statistical TestStudent's t test and Fisher's exact test; One‐way analysis of variance; Pearson correlation analysis; Receiver operating curve analysis; Multivariable linear regression.ResultsGlobal T2 value of KD patients in acute phase was the highest, followed by those of chronic‐phase patients and controls (38.83 ± 2.41 msec vs. 37.55 ± 2.28 msec vs. 36.05 ± 1.64 msec). Regional T2 values showed a same trend. There were no significant differences in global and regional T2 values between KD patients with and without coronary artery (CA) dilation, no matter in acute or chronic phase (all KD patients: P = 0.51, 0.51, 0.53, 0.72; acute KD: P = 0.61, 0.37, 0.33, 0.83; chronic KD: P = 0.65, 0.79, 0.62, 0.79). No significant difference was observed in global T2 values between KD patients with Z score > 5.0 and 2.0 < Z score ≤ 5.0 (P = 0.65). Multivariate analysis demonstrated that stage of disease (β = −0.123) and heart rate (β = 0.280) were independently associated with global T2 values.Data ConclusionThe degree of myocardial edema was more severe in acute‐phase than in chronic‐phase KD patients. Myocardial edema persists in patients regardless of the existence or degree of CA dilation.Evidence Level2Technical EfficacyStage 2

Editorial for “Quantitative Assessment of Myocardial Edema byMR T2Mapping in Children With Kawasaki Disease”

“…6 In the present study, the authors prospectively quantified myocardial edema by comparing 31 controls and 90 patients with KD (including 40 with acute-phase and 50 with chronic-phase) using cardiac MRI and explored the independent predictors of T2 values. 7 To our knowledge, this is the first study to quantitatively evaluate myocardial edema in KD patients with T2 mapping. The authors concluded that global and regional myocardial edema were present in patients with KD and were more pronounced in patients with acute KD than in those with chronic KD.…”