Tissue-engineered myocardial patch derived from extracellular matrix provides regional mechanical function

Paul V. Kochupura, Evren U. Azeloglu, Damon J. Kelly, Sergey V. Doronin, Stephen F. Badylak, Irvin B. Krukenkamp, Ira S. Cohen, Glenn R. Gaudette*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

155 Scopus citations

Abstract

Background - Extracellular matrix (ECM), a tissue-engineered scaffold, recently demonstrated cardiomyocyte population after myocardial implantation. Surgical restoration of myocardium frequently uses Dacron as a myocardial patch. We hypothesized that an ECM-derived myocardial patch would provide a mechanical benefit not seen with Dacron. Methods and Results - Using a canine model, a full thickness defect in the right ventricle was repaired with either Dacron or ECM. A third group had no surgery and determined baseline RV function. Eight weeks later, global systolic function was assessed by the preload recruitable stroke work relationship. Regional systolic function was measured by systolic area contraction (SAC), calculated by high density mechanical mapping. Tau was used to assess global diastolic function. Recoil rate and diastolic shear were used as measures of regional diastolic function. After functional data acquisition, tissue was fixed for histological evaluation. Global systolic and diastolic functions were similar at baseline and after ECM and Dacron implantation. Regional systolic function was greater in the ECM group compared with the Dacron group (SAC: 4.1±0.9% versus -1.8±1.1, P<0.05). Regional diastolic function was also greater in the ECM group (recoil rate (° sec-1): -44±7 versus -17±2, ECM versus Dacron; P<0.05). Immunohistochemical analysis revealed cardiomyocytes in the ECM implant region, a finding not seen with Dacron. Conclusion - At 8 weeks, an ECM-derived tissue-engineered myocardial patch provides regional mechanical function, likely related to cardiomyocyte population. These results are in sharp contrast to Dacron, a commonly used myocardial patch.

Original languageEnglish
Pages (from-to)I144-I149
JournalCirculation
Volume112
Issue number9 SUPPL.
DOIs
StatePublished - 30 Aug 2005
Externally publishedYes

Keywords

  • Heart failure
  • Mechanics
  • Myocytes
  • Remodeling
  • Surgery

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