Structural remodeling of cardiac myocytes in patients with ischemic cardiomyopathy.

Published

Journal Article

BACKGROUND: Chronic ischemic heart disease may lead to ventricular dilation and congestive heart failure (ischemic cardiomyopathy [ICM]). The changes in cardiac myocyte shape associated with this dilation, however, are not known. METHODS AND RESULTS: Left ventricular myocyte dimensions were assessed in cells isolated from explanted human hearts obtained from patients with ICM (n = 6) who were undergoing heart transplantation. Cells were also examined from three nonfailing donor hearts with normal coronary arteries (NCA). Compared with cells from patients with NCA, myocyte length was 40% longer in hearts from patients with ICM (197 +/- 8 versus 141 +/- 9 microns, p less than 0.01), cell width was not significantly different, and cell length/width ratio was 49% greater (11.2 +/- 0.9 versus 7.5 +/- 0.6, p less than 0.01). Sarcomere length was the same in myocytes from both groups. The extent of myocyte lengthening is comparable to the increase in end-diastolic diameter commonly reported in patients with ICM. CONCLUSIONS: These data suggest that increased myocyte length (an intracellular event), instead of myocyte slippage (an extracellular event), is largely responsible for the chamber dilation in ICM. Furthermore, maladaptive remodeling of myocyte shape (e.g., increased myocyte length/width ratio) may contribute to the elevated wall stress (e.g., increased chamber radius/wall thickness) in ICM.

Full Text

Duke Authors

Cited Authors

  • Gerdes, AM; Kellerman, SE; Moore, JA; Muffly, KE; Clark, LC; Reaves, PY; Malec, KB; McKeown, PP; Schocken, DD

Published Date

  • August 1992

Published In

Volume / Issue

  • 86 / 2

Start / End Page

  • 426 - 430

PubMed ID

  • 1638711

Pubmed Central ID

  • 1638711

International Standard Serial Number (ISSN)

  • 0009-7322

Digital Object Identifier (DOI)

  • 10.1161/01.cir.86.2.426

Language

  • eng

Conference Location

  • United States