I am pI eased to present to the readers the Proceedings of the Second International Congress on Myocardial and Cellular Bioenerge­ tics and Compartmentation which was held in Los Angeles during February 16-18, 1984. I would I ike to express my deep appreciation to all those who have encouraged us to hold the Second International Congress. This endeavor could not have been possible without the generous finan­ cial support of the following: The American Society for Magnesium Research, The University of Southern California Department of Con­ tinuing Medical Education, Alpha Therapeutics, ALSEB Scientific Products, The American Physiological Society, Ciba-Geigy Corpora­ tion, Victor Gura, M.D., Merck Sharp