[Comparative analysis of bleed volume with visual technique].

Background: Blood loss estimation in a surgery is made by anesthesiologists by means of visual technique, which is not reliable because it can change depending on the judgement of every person, or his/her work experience, which is why it is considered something subjective. Therefore, the results obtained could lead to make mistakes with the exact amount of bleeding, mismanaging unnecessary hemoderived transfusions or administering unnecessary drugs.

Objective: To compare the blood volume and its visual calculation between Anesthesiology residents and anesthesiologists.