Paris, France - 1 Sept 2019: Influenza vaccination in patients with high blood pressure is associated with an 18% reduced risk of death during flu season, according to research presented today at ESC Congress 2019 together with the World Congress of Cardiology.(1)
"Given these results, it is my belief that all patients with high blood pressure should have an annual flu vaccination," said first author Daniel Modin research associate of the University of Copenhagen, Denmark. "Vaccination is safe, cheap, readily available, and decreases influenza infection. On top of that, our study suggests that it could also protect against fatal heart attacks and strokes, and deaths from other causes."
According to previous research, the stress flu infection puts on the body may trigger heart attacks and strokes. Patients with hypertension (high blood pressure) are at raised risk of heart attack and stroke. By stopping flu infection, vaccination could also protect against cardiovascular events, but until now this had not been investigated.
The study used Danish nationwide healthcare registers to identify 608,452 patients aged 18 to 100 years with hypertension during nine consecutive influenza seasons (2007 to 2016). The researchers determined how many patients had received a flu vaccine prior to each season. They then followed patients over each season and tracked how many died. In particular, they recorded death from all causes, death from any cardiovascular cause, and death from heart attack or stroke.
Finally, they analysed the association between receiving a vaccine prior to flu season and the risk of death during flu season. The analysis controlled for patient characteristics that could impact the likelihood of dying such as age, comorbidities, medications, and socioeconomic status.
After adjusting for patient differences, in a given influenza season, vaccination was associated with an 18% relative reduction in the risk of dying from all causes, a 16% relative reduction in the risk of dying from any cardiovascular cause, and a 10% relative reduction in the risk of dying from heart attack or stroke.
Mr Modin said: "We show that influenza vaccination may improve cardiovascular outcomes in patients with hypertension. During the nine flu seasons we studied, vaccine coverage ranged from 26% to 36%, meaning that many patients with high blood pressure were not vaccinated. If you have high blood pressure, it would be worth discussing vaccination with your doctor."
Regarding how flu and cardiovascular disease might be connected, Mr Modin noted that when the influenza virus infects the body it triggers a strong immune reaction and subsequent inflammation. These responses fight the infection and clear the virus from the body but may increase the risk of having a heart attack or stroke.
He said: "Heart attacks and strokes are caused by the rupture of atherosclerotic plaques in the arteries leading to the heart or the brain. After a rupture, a blood clot forms and cuts off the blood supply. It is thought that the high levels of acute inflammation induced by influenza infection reduce the stability of plaques and make them more likely to rupture."
Notes to editors
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Funding: The study was supported by the Herlev & Gentofte University Hospital Internal Research Fund and by the Novo Nordisk Foundation (grant number: NNF18OC0052966). The sponsors had no role in the study design, data collection, data analysis, data interpretation, or writing.
References and notes
(1) The abstract "The flu vaccine and mortality in hypertension. A Danish nationwide cohort study" will be presented during:
* The press conference Your choices for heart health on Saturday 31 August from 14:00 to 15:00 CEST.
* Young Investigator Award Session Population Sciences on Sunday 1 September at 11:00 to 12:00 CEST in room Prague - Village 2.
ESC Congress is the world's largest gathering of cardiovascular professionals contributing to global awareness of the latest clinical trials and breakthrough discoveries. ESC Congress 2019 together with the World Congress of Cardiology takes place from 31 August to 4 September at the Expo Porte de Versailles in Paris, France. Explore the scientific programme. http://spo.
The European Society of Cardiology brings together health care professionals from more than 150 countries, working to advance cardiovascular medicine and help people lead longer, healthier lives.
This press release accompanies both a presentation and an ESC press conference at ESC Congress 2019 together with the World Congress of Cardiology. It does not necessarily reflect the opinion of the European Society of Cardiology.