Dr. George Kaysen, MD was hired by plaintiff's attorney as a medical expert. Kaysen teaches at UC Davis; his expertise is in nephrologist, specializing in kidney disease, including electrolite abnormalities. He said that hyponatremia "happens quite commonly," especially with patients on diuretics. He spent a lot of time educationg the jury as to the technical meaning of hyponatremia; it came down to the dilution of the level of salt in the bloodstream balances with the level of salt in the cells, and that when the salt fell below a certain level, it would cause cell swelling, and brain swelling. Kaysen also said that no matter how much water a person drinks, the kidney can only process ab