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Myocyte/capillary mismatch in the heart of uremic patients.

K Amann, M Breitbach, E Ritz and G Mall
JASN June 1998, 9 (6) 1018-1022; DOI: https://doi.org/10.1681/ASN.V961018
K Amann
Department of Pathology, University of Heidelberg, Germany.
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M Breitbach
Department of Pathology, University of Heidelberg, Germany.
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E Ritz
Department of Pathology, University of Heidelberg, Germany.
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G Mall
Department of Pathology, University of Heidelberg, Germany.
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Abstract

Experiments indicate that capillary density is reduced in the hypertrophied left ventricle of rats with subtotal nephrectomy compared to control rats with similar BP and left ventricular hypertrophy, suggesting that in uremia, hypertrophying cardiomyocytes outgrow their capillary supply. No information on myocardial capillary supply in humans is currently available. The hearts of nine dialyzed patients, nine patients with essential hypertension, and 10 normotensive control subjects at postmortem were obtained. Subjects with stenosing coronary lesions and left ventricular pump failure were excluded. Special sampling procedures were used to exclude stereologic artefacts. Capillaries were specifically stained with ulex lectin and analyzed by stereologic techniques. Length density of myocardial capillaries (Lv; mm/mm3) was significantly (P < 0.001) lower in dialyzed patients (1483 +/- 238) than in patients with essential hypertension (1872 +/- 243) or in normotensive control patients (2898 +/- 456). In parallel, myocyte diameter and volume density of myocardial interstitial tissue were significantly (P < 0.001) increased in uremic patients compared to patients with essential hypertension and control patients, respectively. Diminished left ventricular capillary supply in renal failure must increase critical oxygen diffusion distance in the myocardium, thus exposing cardiomyocytes to the risk of hypoxia. It is unknown whether such reduced ischemia tolerance can be reversed by increasing oxygen supply (e.g., by reversing anemia).

  • Copyright © 1998 by American Society of Nephrology
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Journal of the American Society of Nephrology
Vol. 9, Issue 6
1 Jun 1998
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Myocyte/capillary mismatch in the heart of uremic patients.
K Amann, M Breitbach, E Ritz, G Mall
JASN Jun 1998, 9 (6) 1018-1022; DOI: 10.1681/ASN.V961018

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Myocyte/capillary mismatch in the heart of uremic patients.
K Amann, M Breitbach, E Ritz, G Mall
JASN Jun 1998, 9 (6) 1018-1022; DOI: 10.1681/ASN.V961018
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