Volume 3 ; Issue 2 ; in Month : July-Dec (2019) Article No : 126
Domínguez MAR, Galindo AME, Rivera LJM, et al.

Introduction: For decades, intraoperative anemia has been treated with red blood cell transfusions since it was believed that oxygen supply would increase by increasing hemoglobin levels. There is evidence that blood transfusion is associated with adverse events and should be avoid as much as possible. For this purpose, it is essential to know the compensatory physiological mechanisms during anemia. Venous oxygen saturation is a clinical tool that integrates the relationship between oxygen intake and consumption, which is easy to obtain once a central venous catheter, is available. Material and methods: A longitudinal, prospective, observational study was conducted which included patients schedule for elective or emergency procedures that, due to their clinical conditions, had a central venous catheter. A sample of venous blood was taken from the central venous catheter and sent to the laboratory for gasometry. The results were correlated with the clinical status and vital signs of the patient. The following variables were evaluated: vital signs, hemoglobin, hematocrit and oxygen saturation before and after transfusion. Results: 34 patients were evaluated with an average age of 52 years. 58.8% was transfused. Despite the transfusion and variations of hemoglobin, the SaO2 in the pulse oximeter remained without changes pre and post transfusion. In gasometry, a difference between hemoglobin and initial hematocrit and pre-transfusion was observed, this due to bleeding that occurred. No differences in SaO2 values were observed for pre-transfusion vs posttransfusion pulse oximetry. Conclusions: We found no evidence to support the linear correlation of ScvO2 with the hemoglobin levels, there is great variability of ScvO2 at different hemoglobin level, we suggest the use of venous central saturation as a physiological marker for transfusions, avoiding with this practice making decisions only with the hemoglobin levels.

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