Transfusion double whammy? Adrenaline‐takotsubo‐anaphylaxis‐Kounis complex post transfusion?

Background and Objectives The adrenaline‐takotsubo‐anaphylaxis‐Kounis, or the ATAK complex, where there are clinical and pathophysiological overlaps between takotsubo and Kounis syndromes, in which histaminergic, adrenergic and other mediators may play roles, was recently described. The objective of this report was to describe three cases where the ATAK complex was suspected to have occurred after transfusion. Materials and Methods Three cases were recently reported to the New Zealand Blood Service haemovigilance programme that appeared to have features in common suggestive of the ATAK complex. Results All three patients had had a blood component transfused, an initial severe allergic reaction, treatment with adrenaline or a congener, subsequent acute left ventricular failure or transfusion‐associated circulatory overload, and features suggestive of takotsubo cardiomyopathy. Conclusions Although rarely described, transfusion‐associated ATAK complex may be occurring more often than believed. Circumstances during a transfusion may predispose to it. It should be suspected if the sequence of events described above occur. Its characteristics need to be better understood. Risk factors for it may be modifiable.