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The Journal of Thoracic and Cardiovascular Surgery, Vol 96, 54-61, Copyright © 1988 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

Three solutions for preservation of the rabbit heart at 0 degree C. A comparison with phosphorus-31 nuclear magnetic resonance spectroscopy

TA English, J Foreman, DG Gadian, DE Pegg, D Wheeldon and SR Williams
Papworth Hospital, Cambridge, England.

Phosphorus-31 nuclear magnetic resonance has been used to measure changes in tissue adenosine triphosphate and pH that occur during hypothermic preservation of rabbit hearts. Three potential preservation solutions were studied: the St. Thomas' Hospital no. 1 cardioplegic solution, Bretschneider's HTP solution, and a solution originated in our laboratory, CP5, which we have previously studied in the rabbit heart with functional assessment by Langendorff perfusion. After being flushed with one of these solutions, each heart was stored at 0 degrees C for 12 hours, during which time it was subjected to repeated phosphorus-31 nuclear magnetic resonance scans. It was shown that adenosine triphosphate levels decayed more slowly with CP5 than with either of the other solutions or in the control experiments. Adenosine triphosphate decay was also slower with Bretschneider's HTP than with St. Thomas' Hospital solution, but pH was somewhat better maintained with Bretschneider's HTP than with either other solution or in the control hearts, although the pH did not decrease drastically in any group. CP5 was designed to prevent cell swelling and to reduce the uptake of calcium during storage, for which reasons it contains 30 mmol/L glucose and 0.1 mmol/L calcium. The potassium content is somewhat higher and the sodium and magnesium content somewhat lower than in St. Thomas' Hospital solution, with the objective of stabilizing intracellular concentrations of these ions during storage.


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