Aged, Anaerobiosis, Blood, Cardioplegic Solutions, Case-Control Studies, Coronary Artery Bypass, Female, Heart Arrest, Induced, Heart Valve Prosthesis, Humans, Hypothermia, Induced, Lactates, Lactic Acid, Male, Middle Aged, Mitral Valve, Myocardium, Reoperation, Temperature, Ventricular Function, Left, Ventricular Function, Right