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(Circulation. 2002;105:2143.)
© 2002 American Heart Association, Inc.

Clinical Investigation and Reports

Influenza Vaccine Pilot Study in Acute Coronary Syndromes and Planned Percutaneous Coronary Interventions

The FLU Vaccination Acute Coronary Syndromes (FLUVACS) Study

Enrique P. Gurfinkel, MD, PhD; Ricardo Leon de la Fuente, MD; Oscar Mendiz, MD; Branco Mautner, MD, FESC, for the FLUVACS Study Group^*

From Fundación Favaloro, Capital Federal, Buenos Aires, Argentina.

Correspondence to Enrique P. Gurfinkel, MD, PhD, Fundación Favaloro, Av Belgrano 1746 (1093), Capital Federal, Buenos Aires, Argentina. E-mail epgurfinkel{at}ffavaloro.org

Background— Recent reports have detected an increase in the number of patients with acute coronary syndromes during the flu season. In addition, the World Health Organization recommended vaccination against influenza infection for the Southern hemisphere in the winter of 2001.We evaluated the preventive impact of vaccination on subsequent ischemic events in myocardial infarction patients and in subjects undergoing planned percutaneous coronary angioplasty.

Methods and Results— We included 200 myocardial infarction patients admitted in the first 72 hours and 101 planned angioplasty/stent (PCI) patients without unstable coronary artery disease, prior bypass surgery, angioplasty, or tissue necrosis, in a prospective, multicenter log during the winter season. Infarct patients received a standard therapy and were then randomly allocated in a single-blind manner to either a unique intramuscular influenza vaccination or a control group. Similarly, PCI patients were allocated to either vaccination or control groups. Combined end points (death, reinfarction, and rehospitalization for ischemia) were assessed at 6 months’ follow-up. The first primary outcome, cardiovascular death, occurred in 2% of the patients in the vaccine group compared with 8% in the control group (relative risk with vaccine as compared with controls, 0.25; 95% CI 0.07 to 0.86; P=0.01). The triple composite end point occurred in 11% of the patients in the vaccine group compared with 23% in controls (P=0.009).

Conclusions— Influenza vaccination may reduce the risk of death and ischemic events in patients suffering from infarction and those recovering from angioplasty during flu season. This response could be related to a humoral immune response with positive consequences during flu seasons.

Key Words: myocardial infarction • infection • immune system • atherosclerosis

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