[Changes in cerebral hemodynamics in chronic users of "PACO" and cocaine: case-control study].

Objective: To assess if there are changes in brain hemodynamics evaluated by means of transcranial doppler's flow velocity, pulsatile index and cerebral perfusion pressure, between cocaine chronic abusers and healthy volunteers.

Method: Prospective, case and control, observational study. Sex, age, user history, vital signs and transcranial doppler findings.