Transcranial Doppler (TCD) is a useful tool in the diagnosis of both regional and diffuse vasospasm, as it is demonstrated in this case (corroborated by angiography). This makes it possible not to reduce triple therapy H when the patient still requires it, TCD is a important arsenal we have, it is not enough clinical diagnosis, since the TCD is noninvasive, fast, online, is performed in bed Patient, and the Doppler vasospasm occurs before clinical vaospasm which makes it a very useful tool. I believe that we are advancing in this area of neuromonitoring in Peru, having as final result patient with favorable evolution, if not for the measurements made.