As you are probably aware, a revision of the ISBT/IHN definition for transfusion-associated circulatory overload (TACO) was launched in 2013 at the request of members. The draft in the link below explains the rationale for the revision and contains revised reporting criteria; it will be publicly available on the ISBT, IHN and AABB websites for comment until the end of January 2017. The revision group invites you to circulate this information as widely as possible.
Transfusion-associated circulatory overload (TACO) Draft revised reporting criteria