Blood transfusion is a liquid transplant: each unit places donor cells, plasma proteins and donor leucocyte-fragments into a recipient, with benefits (oxygen carriage, haemostasis, volume) balanced against immune, infectious, and circulatory risks. Full topic, figures, and citations: https://medvellum.com/topics/transfusion-medicine Chapters 00:00 The one-line answer 01:32 Meet the patient 02:14 Red flags 03:26 The universal-donor map — O negative gives cells, AB gives plasma 05:31 Match the component to the deficit — never reach for "blood" 06:36 The three minutes that stop the killer — gro…
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