Oxygenated crystalloid cardioplegia: a new technique

been driven out of the solution is removed by needle and syringe and the cardioplegia concentrate added to the Ringer’s solution. Pure oxygen is then added via a filter (Millipore 0.2 microns) to a pressure according to the required oxygen content and the Viaflex bag is refrigerated at 4°C. From Figure 1 it is evident that there is a steep increase in pO, related to the internal pressure, up to about 55mmHg, after which there is little further increase in oxygen content with increasing oxygen pressure. Solutions prepared in this way have been shown to be stable for more than 20