This was a descriptive, observational, prospective and analytical study. The participants were residents of anesthesiology with previous training in ECVA from a Colombian university. The evaluation was performed by an anesthesiologist expert in ultrasound directly and through a video screen of the ultrasound machine in the moment ECVA started in the clinical setting. This was done with the approval of the Research Ethics Committee.
 
Results
67 evaluations were made for ECVA. They were analyzed according to the year of residence (R 1 / R 2 / R 3 ). Significant differences were found in the dependent variables of the needle and of time, with values of p <0.05. Like the number of punctures and time of insertion of the catheter. See table No. 1
There was no significant difference in the success of ECVA among R1, R2, R3 but with a shorter ascending and successful curve in R1 and R2. Figure No 1
The R1 tends to have greater success and a lower complication rate, possibly due to a better accompaniment and support in our daily practice. Figure No 2.  75% of complications occurred with more than one puncture. The variables which have more impact on the ECVA success are needle visualization and interpretation of the image.

5 - TO EVALUATE THE SUCCESS IN CENTRAL VENOUS ACCESS GUIDED BY ULTRASOUND (ECVA) IN PERSONNEL PREVIOUSLY TRAINED IN SIMULATED MODELS.