We conducted a retrospective study of data on 78,974 Medicare beneficiaries 65 years old or older who were hospitalized with acute myocardial infarction. Patients were categorized according to the hematocrit on admission (5.0 to 24.0 percent, 24.1 to 27.0 percent, 27.1 to 30.0 percent, 30.1 to 33.0 percent, 33.1 to 36.0 percent, 36.1 to 39.0 percent, or 39.1 to 48.0 percent), and data were evaluated to determine whether there was an association between the use of transfusion and 30-day mortality.
Raziskovalci so izpeljali retrospektivno raziskavo, v kateri so 78.974 zavarovancev sistema Medicare, ki so se zdravili v bolnišnici zaradi srčnega infarkta in so bili stari vsaj 65 let, razslojili v 7 skupin glede na vrednost hematokrita ob sprejemu v bolnišnico (razpon od 0,05 do 0,48). Z analizo po skupinah so ugotavljali vpliv transfuzije krvi na 30-dnevno umrljivost.