All patients complying with the inclusion criteria were consecutively included during preanaesthetic evaluation, once the study had been explained to them and they had signed the informed consent form. They were programmed for surgery and assigned a number corresponding to the random distribution at the same time; this was defined by a random number generator 001 to 100 sequence, corresponding to the devices being evaluated.
Durante la evaluación preanestésica, fueron incluidos en forma consecutiva todos los pacientes que cumplieron los criterios de inclusión, luego de explicarles y firmar el consentimiento informado; se programaron para cirugía, en la que se asignó el número correspondiente a la distribución aleatoria, la cual se definió por un generador de números en una secuencia entre 001 y 100, correspondientes a los dispositivos evaluados.