ワタナベ エリ   WATANABE Eri
  渡邉 絵里
   所属   医学部 医学科(東京女子医科大学病院)
   職種   助教
論文種別 原著
言語種別 英語
査読の有無 査読あり
表題 Association between myocardial hypoxia and fibrosis in hypertrophic cardiomyopathy: analysis by T2* BOLD and T1 mapping MRI.
掲載誌名 正式名:European radiology
略  称:Eur Radiol
ISSNコード:09387994/14321084
掲載区分国外
出版社 Springer
巻・号・頁 30(8),4327-4336頁
著者・共著者 ANDO Kiyoe†, NAGAO Michinobu*, WATANABE Eri, SAKAI Akiko, SUZUKI Atsushi, NAKAO Risako, ISHIZAKI Umiko, SAKAI Shuji, HAGIWARA Nobuhisa
発行年月 2020/03
概要 OBJECTIVES:
We assessed whether an association exists between myocardial oxygenation and myocardial fibrosis in patients with hypertrophic cardiomyopathy (HCM), using blood-oxygen-level-dependent (BOLD) T2* cardiac magnetic resonance imaging (T2*-CMR) and T1 mapping.

METHODS:
T1 mapping and T2*-CMR data were collected from 55 HCM patients using a 3-T MR and were prospectively analyzed. T2*-CMR was conducted using the black blood, breath-hold, multi-echo, and gradient echo sequence. Over 10 min, inhalation of oxygen at the flow rate of 10 L/min, T2* for mid-septum was measured following room-air and oxygen inhalation, and ΔT2* ratio (T2*oxy-T2*air/T2*air, %) was calculated. During pre- and post-gadolinium enhancement, native T1 (ms) and extracellular volume fractions (ECV, %) were calculated at sites same as the T2* measurement. Hypoxia was defined as the segment with an absolute value of the ΔT2* ratio ≥ 10%.

RESULTS:
ΔT2* ratio was significantly higher for segments with native T1 ≥ 1290 ms than those with native T1 < 1290 ms (21 ± 32% vs. 8 ± 6%, p = 0.005). ΔT2* ratio was also significantly higher for segments with ECV ≥ 28% than those with ECV < 28% (21 ± 32% vs. 8 ± 8%, p = 0.0003). ROC curve analysis revealed that ΔT2* ratio could detect segments with native T1 ≥ 1290 ms and ECV ≥ 28% and c-statistics of 0.72 and 0.79. According to the multivariate logistic regression analysis results, ECV is an independent factor in hypoxia (odds ratio, 1.47; 95% confidence interval, 1.02-2.13; p < 0.05).

CONCLUSIONS:
Analysis of BOLD T2*-CMR and T1 mapping revealed that ECV is strongly associated with ΔT2* ratio, suggesting that the onset of myocardial fibrosis is related to hypoxia in HCM patients.
DOI 10.1007/s00330-020-06779-9
PMID 32211964