Concentrations of the ingredients have been analysed in a nonstandard cardioplegia solution (CS) and CS from St. Thomas Hospital at the outset before CS introduction into the coronary vessels of patients under cardioplegia. It has been shown that the use of nonstandard CS was accompanied by undesirable variability in ingredient concentration, which to some extent may be accounted for by the use of incompletely unfrozen CS. The use of CS from St. Thomas Hospital could be accompanied by moderate hypermagnesiumemia, which did not lead to the onset of vascular insufficiency. It is stressed that plasma magnesium content should be controlled when this CS is used.

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