Hypovolemia, shock (if more blood removed than transfused)
Acute transfusion reactions
Intravascular hemolytic transfusion reaction
Febrile nonhemolytic transfusion reaction
Allergic transfusion reaction
Transfusion-associated circulatory overload (TACO)
Transfusion-related acute lung injury (TRALI)
Transfusion-associated graft-versus-host disease
Fluid overload
Sepsis
Delayed transfusion reactions<unk> ravascular hemolytic transfusion reaction
Graft-vs-host disease
Infection
PE/DVT
Hypokalemia, hyperkalemia, hypocalcemia, hypoglycemia
Intravascular hemolytic transfusion reaction
Febrile nonhemolytic transfusion reaction
Allergic transfusion reaction
Transfusion-associated circulatory overload (TACO)
Transfusion-related acute lung injury (TRALI)
Transfusion-associated graft-versus-host disease
Fluid overload
Sepsis<unk> ravascular hemolytic transfusion reaction
Graft-vs-host disease
Infection
Exchange transfusion
Massive transfusion
Massive transfusion 
Platelet transfusion
Cryoprecipitate transfusion
Fresh frozen plasma
Packed red blood cells
Plasmapheresis