SvO2 Trigger in Transfusion Strategy After Cardiac Surgery (ReTSEACS)

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University Hospital Center (CHU)




Undergoing Nonemergent Cardiac Surgery
Anemia (<9g/dL) Requiring Blood Transfusion
Central Venous Catheter on the Superior Vena Cava (to Perform ScVO2 Measure)
Bleeding Graded as Insignificant, Mild, Moderate of Universal Definition of Perioperative Bleeding
Hemodynamic and Respiratory Stability


Other: Red blood cell tranfusion
Other: ScvO2 measure

Study type


Funder types




Details and patient eligibility


Current international guidelines suggest a restrictive transfusion strategy, setting that Hb level at 7 g/dl is a reasonable threshold. However, the idea of having only one threshold for all the patients has been challenged by authors, suggesting a more liberal strategy for certain cases. At the moment, there is no other parameter considered accurate enough to be taken into consideration for transfusion strategy management. This study is to use ScVO2, a current, easily accessible parameter, before blood transfusion in order to stratify its indication after cardiac surgery. Monocentric, randomised, single blind study (patient not aware of the group assignments) Patient inclusion will be made in ICU if the physician decides to perform blood transfusion according to standard transfusion strategy to treat a postoperative anemia (Hb<9g/dL). Every patient will go through randomization to be placed in one of the two groups of the study: either the one whose transfusion strategy is adjusted by the pretransfusion ScvO2 (group ScvO2), or the control group. Our main objective is to evaluate the impact of a new transfusion strategy founded on guidelines, but provided ScvO2 is less than 65%, on the incidence of red blood cells transfusion for anemia early after cardiac surgery.

Full description

Currently, the rate of transfusion of cardiac surgery patients is approximately 50%. The decision to transfuse is based on the hemoglobin (Hb), the transfusion threshold from 7 to 9 g / dL seems to be reasonable, based on clinical parameters, as well as patient history, as the degree of coronary stenosis . Several randomized studies have shown that a restrictive transfusion strategy was superior to a liberal strategy. ScvO2 is a parameter reflecting the balance between transport O2 and O2 in tissue consumption, which Hb is one of the determinants. It requires that a levy on central venous used frequently for such patients. ScvO2 could make better account of the actual tolerance of anemia that the only value of Hb and the patient's clinical characteristics. We therefore hypothesize that ScvO2 can help with the decision of RBC transfusions after heart surgery. Primary and secondary endpoints Principal: To assess the value of ScvO2 threshold (65%) in the restrictive transfusion strategy on the incidence of transfusion after cardiac surgery. secondary: Assess the impact of transfusion strategy based on ScvO2 on the number of transfused patients at D28 Assess the impact of transfusion strategy based on ScvO2 on the number of cells transfused concentrates. Assess the impact of transfusion strategy based on ScvO2 on mortality or incidence of disease events such as cardiac complications, renal, respiratory or neurological dysfunction in the immediate aftermath of surgery.


100 patients




18 to 100 years old


No Healthy Volunteers

Inclusion criteria

  • Age over 18 years
  • Patients admitted to intensive care after heart surgery
  • Anemic patient (Hb < 9 g/dL)
  • Patient with a central venous catheter in the territory SVC

Exclusion criteria

  • Patient with acute bleeding defined as a postoperative bleeding over 1000 ml in 12 hours or the need for a recovery operation for hemostasis or the transfusion of blood units over 4
  • Patient with severe sepsis or septic shock criteria defined by the Surviving Sepsis compaign

Trial design

Primary purpose




Interventional model

Parallel Assignment


Single Blind

100 participants in 2 patient groups

ScVO2 group
Experimental group
Anemia (<9g/dL) requiring blood transfusion Measure of ScvO2 : ScVO2 is measured using the central venous catheter placed in the superior vena cava. Transfusion is performed if the ScVO2 is inferior or equal to 65%.
Other: ScvO2 measure
Control group
Other group
Anemia (<9g/dL) requiring blood transfusion : Transfusion is performed following national guidelines for red blood cell transfusion
Other: Red blood cell tranfusion

Trial contacts and locations



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