The patients were eligible if they were going to undergo unilateral orthopedic surgery of the upper limb, the estimated surgical time exceeded thirty minutes, if they were classified as ASA I, II or III and were over 18 years old.
Los pacientes fueron elegibles si iban a ser sometidos a cirugía ortopédica del miembro superior unilateral, si el tiempo estimado de cirugía era mayor de treinta minutos, si estaban clasificados como ASA I, II ó III y si su edad era mayor de 18 años.