The goal of this interventional study is to asses echocardiographic variations in emergency department's elderly patients receiving red blood cell transfusion. The main questions it aims to answer are : * is there a modification of echocardiographic parameters after red blood cell transfusion ? * which parameter is the most impacted by red blood cell transfusion ? Participants will have a transthoracic echocardiography before, just after and 15 minutes after red blood cell transfusion.
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E/A ratio modification
Timeframe: Base line, just after and 15 minutes after red blood cell transfusion