Relation of functional and morphological changes in mitochondria to myocardial contractile and relaxation reserves in asymptomatic to mildly symptomatic patients with hypertrophic cardiomyopathy

Kazumasa Unno, Satoshi Isobe, Hideo Izawa, Xian Wu Cheng, Masakazu Kobayashi, Akihiro Hirashiki, Takashi Yamada, Ken Harada, Satoru Ohshima, Akiko Noda, Kohzo Nagata, Katsuhiko Kato, Mitsuhiro Yokota, Toyoaki Murohara

研究成果: Article査読

35 被引用数 (Scopus)

抄録

AimsTo examine the relation between mitochondrial dysfunction and myocardial contractile and relaxation reserves in hypertrophic cardiomyopathy (HCM).Methods and resultsThirty HCM patients (LVEF ≥60%) underwent biventricular cardiac catheterization analysis both at rest and during atrial pacing as well as myocardial 99mTc-sestamibi scintigraphy at rest to calculate washout rate. Endomyocardial biopsy specimens were obtained for quantitative mRNA analysis and electron microscopy. The HCM patients were divided into two groups - group A: normal force-frequency relation and a pressure half-time (T1/2) of <30 ms (n = 15); group B: abnormal force-frequency relation or T1/2 of ≥30 ms (n = 15). The 99mTc- sestamibi washout rate was significantly correlated with T1/2 for all patients (r = 0.74, P < 0.01) and was also significantly greater in group B (29.2 ± 6.3%) than in group A (19.3 ± 3.1%). The abundance of mRNAs for mitochondrial electron transport-related enzymes was significantly higher in group A than in group B. Mitochondria showed a greater variation in size and were more disorganized in group B than in group A.

本文言語English
ページ(範囲)1853-1862
ページ数10
ジャーナルEuropean heart journal
30
15
DOI
出版ステータスPublished - 08-2009
外部発表はい

All Science Journal Classification (ASJC) codes

  • 循環器および心血管医学

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