Muñoz P, Vicent L, Bouza E, et al. – Researchers performed a prospective registry during the flu season in a coronary unit to determine the presentation and prognosis of influenza, as well as the effect of an active surveillance program in the diagnosis. Two phases were involved: the first phase wherein no systematic screening was carried out, and the second phase in which systematic influenza A and B detection was conducted for all patients admitted. The likelihood of having a non-ischemic cause of admission, fever, and respiratory failure was greater in influenza patients. Of all patients admitted to an intensive cardiac care unit during the flu season, about 8% were affected by influenza; a high mortality rate was reported in these patients. Improvement in early detection was seen after the implementation of an active surveillance program.