| Advantages of perfluorochemical perfusion in the isolated working rabbit heart preparation using 31P-NMR. | |
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MedLine Citation:
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PMID: 3814627 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Quantitative 31P-NMR and enzymatic analysis of high-energy phosphates were used to characterize an isolated perfused working rabbit heart preparation. In this model, the left side of the heart works against a physiological after-load. Two perfusates, Krebs-Henseleit saline and the perfluorocarbon emulsion FC-43 (perfluorotributylamine), were evaluated in their ability to maintain cardiac function and high-energy phosphate metabolites over a period of 2-3 h. Adenine nucleotides ATP, ADP, phosphocreatine and inorganic phosphate (Pi) were measured by 31P-NMR while monitoring cardiac output and coronary flow. Intracellular pH was determined using the chemical shift of Pi. At the end of each experiment, hearts were freeze clamped and enzymatically assayed for adenine nucleotides, phosphocreatine and Pi. In every experiment, hearts perfused with FC-43 emulsion maintained the same rate of cardiac output as hearts perfused with Krebs-Henseleit saline, but with half the coronary flow rate: FC-43, 22 +/- 2.5 (n = 5), Krebs-Henseleit saline 42 +/- 2.7 (n = 6) ml/min, P less than 0.001. Hearts perfused with FC-43 emulsion showed higher [phosphocreatine] and [ATP] measured by 31P-NMR. For [phosphocreatine]: FC-43 3.2 +/- 0.7 (n = 5), Krebs-Henseleit saline 1.7 +/- 0.2 (n = 6) mumol/g wet wt., P less than 0.01. For [ATP]: FC-43 1.8 +/- 0.7 (n = 5), Krebs-Henseleit saline 0.9 +/- 0.2 (n = 6) mumol/g wet wt., P less than 0.02. [phosphocreatine] and [ATP] determined by 31P-NMR values were identical within experimental error to those values obtained by enzymatic analysis. Comparing [Pi] determined by both methods, 36% of Pi in FC-43-perfused hearts, and only 24% of Pi in Krebs-Henseleit saline-perfused hearts were visible by NMR, indicating that a large proportion of Pi is bound in the intact functioning heart. Similar results were obtained for [ADP]. Using the combined techniques of 31P-NMR and enzymatic assay, we have shown in this model of the isolated working rabbit heart preparation, that FC-43 emulsion maintains significantly better function and high-energy phosphate levels than Krebs-Henseleit saline. |
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Authors:
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D Freeman; H Mayr; P Schmidt; J D Roberts; R J Bing |
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Publication Detail:
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Type: In Vitro; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Biochimica et biophysica acta Volume: 927 ISSN: 0006-3002 ISO Abbreviation: Biochim. Biophys. Acta Publication Date: 1987 Mar |
Date Detail:
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Created Date: 1987-04-20 Completed Date: 1987-04-20 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0217513 Medline TA: Biochim Biophys Acta Country: NETHERLANDS |
Other Details:
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Languages: eng Pagination: 350-8 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adenine Nucleotides
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metabolism* Animals Cardiac Output Coronary Circulation Emulsions Fluorocarbons Heart / physiology* Heart Rate Hydrogen-Ion Concentration Magnetic Resonance Spectroscopy / methods Male Myocardium / metabolism* Perfusion Phosphates / metabolism* Phosphocreatine / metabolism* Phosphorus Rabbits Stroke Volume |
| Chemical | |
Reg. No./Substance:
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0/Adenine Nucleotides; 0/Emulsions; 0/Fluorocarbons; 0/Phosphates; 67-07-2/Phosphocreatine; 7723-14-0/Phosphorus |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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