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Bydefinition ,massivetransfusionisthereplacementofapatient’sentirebloodvolumewithina 2 4 hourperiod ;orthereplacementofmorethan 5 0 %oftotalbloodvolumein 3hoursorless .Intheabsenceofprolongedshockanddecreasedtissueperfusion ,andifcareistakentoavoiddilutio