Background: Recent reports detected that one of the barriers that vaccination against influenza infection is that, physicians do not strongly recommend its applications to cardiovascular patients at risk. We evaluated the preventive impact of vaccination against death in severe congestive heart failure hospitalized patients.~Methods and Results: A total of 117 severe congestive heart failure patients (New York Heart Association class III and IV) admitted in the first 12 hours who required ventilator support without endotracheal intubations and high doses of loop-diuretics, were included in a prospective, multicenter log, during the winter season. Congestive heart patients received intravenous vasodilators and loop-diuretics plus standard therapies, and then were randomly allocated in a single-blind manner as a unique intramuscular influenza vaccination or as controls. Death, and combined end points (death, and re-hospitalization for any reason) were assessed at 6 months follow-up.~The first primary outcome - cardiovascular death - occurred in 3% of the patients in the vaccine group Vs 17% in controls (odds ratio with vaccine as compared with controls: 0.16; 95 percent confidence interval, 0.33 to 0.79; p=0.022). The composite end point occurred in 33% of the patients in the vaccine group Vs 74% in controls, p = <0.001. The need of adding inotropic drugs occurred in 8% of patients receiving vaccination, and in 12.5% in the control group.
We evaluated the preventive impact of vaccination on subsequent death events in 117 severe congestive heart patients requiring ventilator support without endotracheal intubations and aggressive medical therapy.~They were randomly allocated in a single-blind manner as a unique intramuscular influenza vaccination or as controls.~The first primary outcome evaluated at 6 months follow-up - cardiovascular death - occurred in 3% of the patients in the vaccine group Vs 17% in controls (p=0.022). The composite end point occurred in 33% of the patients in the vaccine group Vs 74% in control group, p = <0.001.