Evaluation of a Variable Ratio Cardioplegia System Joseph J. Deptula, Douglas P. Zavadil, Kevin A. Christensen, R. Troy Sydzyik and Alfred H. Stammers J Extra Corpor Technol, 28 4 (1996) 199-204 Published online: 18 August 2023 DOI: 10.1051/ject/1996284199