Mitochondrial deformity confined to a single cardiomyocyte in human endomyocardial biopsy specimens: Report of 4 cases

During electron microscopic examination of 156 consecutive human endomyocardial biopsy specimens, we found marked mitochondrial deformity within a single cardiomyocyte in each of 4 specimens. The deformed mitochondria were unevenly distributed, but the deformities were confined to the one cardiomyoc...

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Published inJournal of cardiology cases Vol. 16; no. 5; pp. 178 - 182
Main Authors Takemura, Genzou, Kanamori, Hiromitsu, Okada, Hideshi, Tsujimoto, Akiko, Miyazaki, Nagisa, Miyata, Shusaku, Ohta, Hideaki, Kawase, Yoshiaki, Ono, Makoto, Mochizuki, Mamoru, Kobayashi, Shigeki, Onoue, Kenji, Nakano, Tomoya, Sakaguchi, Yasuhiro, Matsuo, Hitoshi, Yano, Masafumi, Saito, Yoshihiko
Format Journal Article
LanguageEnglish
Published Japan Elsevier Ltd 01.11.2017
Japanese College of Cardiology
Subjects
Cardiomyopathy
Endomyocardial biopsy
Mitochondria
Ultrastructure
Mitochondria
Endomyocardial biopsy
Cardiomyopathy
Ultrastructure
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Summary:During electron microscopic examination of 156 consecutive human endomyocardial biopsy specimens, we found marked mitochondrial deformity within a single cardiomyocyte in each of 4 specimens. The deformed mitochondria were unevenly distributed, but the deformities were confined to the one cardiomyocyte. Those affected cardiomyocytes were accompanied by nonspecific degenerative changes such as nuclear hypertrophy and/or rarefaction of the myofibrils. Mitochondria in all other cells within the specimens appeared normal. Such an abnormality has never been reported to date. Each of the four cases was diagnosed with a different ailment: post-myocarditis, dilated cardiomyopathy, amyloidosis, and tachycardia-induced heart failure. However, all four cases were accompanied by left ventricular systolic dysfunction at biopsy. The very limited mitochondrial deformation may thus reflect a type of degenerative change that accompanies heart failure. <Learning objective: A marked mitochondrial deformity must have been overlooked to date, which is confined to a single cardiomyocyte in an endomyocardial biopsy specimen. Its etiology is still unknown but may reflect a type of degenerative change that accompanies heart failure.>
ISSN:1878-5409
1878-5409
DOI:10.1016/j.jccase.2017.07.011