Cardiac remodeling in a new pig model of chronic heart failure: Assessment of left ventricular functional, metabolic, and structural changes ... View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2015-08

AUTHORS

Miikka Tarkia, Christoffer Stark, Matti Haavisto, Rasmus Kentala, Tommi Vähäsilta, Timo Savunen, Marjatta Strandberg, Ville-Veikko Hynninen, Virva Saunavaara, Tuula Tolvanen, Mika Teräs, Johanna Rokka, Mikko Pietilä, Pekka Saukko, Anne Roivainen, Antti Saraste, Juhani Knuuti

ABSTRACT

AIMS: Large animal models are needed to study disease mechanisms in heart failure (HF). In the present study we characterized the functional, metabolic, and structural changes of myocardium in a novel pig model of chronic myocardial infarction (MI) by using multimodality imaging and histology. METHODS AND RESULTS: Male farm pigs underwent a two-step occlusion of the left anterior descending coronary artery with concurrent distal ligation and implantation of a proximal ameroid constrictor (HF group), or sham operation (control group). Three months after the operation, cardiac output and wall stress were measured by echocardiography. Left ventricle (LV) volumes and mass were measured by computed tomography (CT). Myocardial perfusion was evaluated by [(15)O]water and oxygen consumption using [(11)C]acetate positron emission tomography, and the efficiency of myocardial work was calculated. Histological examinations were conducted to detect MI, hypertrophy, and fibrosis. Animals in the HF group had a large anterior MI scar. CT showed larger LV diastolic volume and lower ejection fraction in HF pigs than in controls. Perfusion and oxygen consumption in the remote non-infarcted myocardium were preserved in HF pigs as compared to controls. Global LV work and efficiency were significantly lower in HF than control pigs and was associated with increased wall stress. Histology showed myocyte hypertrophy but not increased interstitial fibrosis in the remote segments in HF pigs. CONCLUSIONS: The chronic post-infarction model of HF is suitable for studies aimed to evaluate LV remodeling and changes in oxidative metabolism and can be useful for testing new therapies for HF. More... »

PAGES

655-665

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s12350-015-0068-9

DOI

http://dx.doi.org/10.1007/s12350-015-0068-9

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1032641386

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/25698475


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