With reference to the measuring method suggested, we report the pressure indices noted in surgery, in order to compare them with those of non-surgical methods, using the Doppler. We also define some parameters for recording the measurements; failure to observe these might result in inaccuracy of the instrumental findings. We have to consider the index of maximum pressure to be attained using the pneumatic cuff, the lenght of time of compression, and the place at which the measurement is taken.