Maintenance of aerobic metabolism during global ischemia with perfluorocarbon cardioplegia improves myocardial preservation.

Abstract

We used phosphorus-31 nuclear magnetic resonance to test the ability of a perfluorocarbon blood substitute that has been shown in previous studies to improve oxygen delivery to hypothermic myocardium to maintain aerobic high-energy phosphate metabolism during total global ischemia. Twenty-three isolated perfused rabbit hearts were subjected to 180 min of hypothermic (23 degrees C) global ischemia followed by 45 min of normothermic reperfusion. Hearts received multiple doses of a cardioplegic solution that contained either oxygenated perfluorocarbon (Fluosol O2), nonoxygenated perfluorocarbon (Fluosol N2), or standard crystalloid hyperkalemic cardioplegic solution (STD-KCl) at 30 min intervals. Recovery of isovolumic left ventricular developed pressure (LVDP) was used to assess preservation of contractile function. Recovery of LVDP was 84 +/- 19% of preischemic control values with Fluosol O2, 68 +/- 16% with Fluosol N2, and 67 +/- 17% with STD-KCl (p = .058 vs Fluosol N2 and p = .056 vs STD-KCl). During 3 hr of ischemia intracellular pH (pHi) fell to 6.68 +/- 0.20 with STD-KCl and to 6.71 +/- 0.14 with Fluosol N2 but remained above 7.00 throughout the ischemic period with Fluosol O2 (p less than .0001 vs Fluosol N2 or STD-KCl). Myocardial ATP content was better preserved at 107 +/- 14% of control values with Fluosol O2 compared to 60 +/- 18% of control with Fluosol N2 and 75 +/- 21% of control with STD-KCl (p less than .001 vs Fluosol N2, p = .002 vs STD-KCl). Phosphocreatine (PCr) was also better preserved with Fluosol O2.(ABSTRACT TRUNCATED AT 250 WORDS)

• Authors: J T Flaherty, J H Jaffin, G J Magovern Jr, K R Kanter, T J Gardner, M V Miceli, W E Jacobus
• Journal: Circulation (Circulation) Vol. 69 Issue 3 Pg. 585-92 (Mar 1984) ISSN: 0009-7322 [Print] United States
• PMID: 6692519 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Blood Substitutes
• Fluorocarbons
• Phosphocreatine
• Adenosine Triphosphate
• Oxygen

Topics

• Adenosine Triphosphate (metabolism)
• Animals
• Blood Substitutes
• Coronary Disease (metabolism, physiopathology)
• Energy Metabolism
• Female
• Fluorocarbons
• Heart Arrest, Induced (methods)
• Hydrogen-Ion Concentration
• Myocardial Contraction
• Oxygen (blood)
• Perfusion
• Phosphocreatine (metabolism)
• Rabbits
• Time Factors