“…In patients with acute dyspnoea, plasma PCT has been used to differentiate between AHF and superimposed pneumonia and been postulated as a promising biomarker for guiding antibiotic therapy in patients with AHF. 9 In the current issue of the Journal, Möckel et al 10 provide the results of a randomized multicentre clinical trial, Improve Management of Acute Heart Failure with Procalcitonin in Europe (IMPACT EU). This study, which was terminated prematurely due to futility, aimed to evaluate whether PCT-guided initiation of antibiotics in patients with suspicion of AHF who present to the emergency department would improve clinical outcomes.…”