Health Care

Large study confirms sixfold increase in heart attack risk

Large study confirms sixfold increase in heart attack risk”

69-year-old Ronald Lebrane has had two heart attacks in the past, and made sure to get his flu shot this year. "It's not every day you see a six-fold increase in the risk during the first seven days of lab-confirmed influenza", chief author Dr. Jeffrey Kwong told Reuters Health in a telephone interview.

Nor can the study say what the absolute risk of heart attack would be for any one person who catches the flu, Kwong said.

But the new findings strengthen the theory that a flu infection can actually trigger a heart attack, according to Dr. Andy Miller, chair-elect of the ACC's Board of Governors.

The researchers found that the risk of heart attacks was somewhat higher for adults over the age of 65, and for patients who were infected with an influenza B strain of the flu, rather than influenza A.

The risk is also there for other respiratory viruses, though flu was the worst. The results were published in the New England Journal of Medicine.

Research published in the New England Journal of Medicine looked at almost 20,000 adult cases of laboratory-confirmed influenza infection between 2009 to 2014 and identified 332 patients who were hospitalised for a heart attack within a year of a lab-confirmed flu diagnosis.

The American Heart Association has more on flu and pneumonia prevention.

The infections can lower blood pressure and thus lower the amount of oxygen in the blood, which forces the heart to compensate by beating faster.

As well, viral infections cause inflammation, which promotes blood clots forming in the blood vessels that serve the heart, again leading to a heart attack. Roughly 25 per cent had experienced a previous heart attack. For 76 percent, it was their first heart attack, technically known as an acute myocardial infarction.

Infection with an influenza virus appears to have the most profound effect, but the risk of having a heart attack was also somewhat increased by such pathogens as respiratory syncytial virus (RSV) and cold-causing adenoviruses and rhinoviruses, he said.

But those increases were not statistically significant.

The study "should not be interpreted as evidence of a lack of vaccine effectiveness, because this study was not created to evaluate the effectiveness of influenza vaccines", the researchers said.

The researchers looked at almost 20,000 Ontario adult cases of laboratory-confirmed influenza infection from 2009 to 2014 and identified 332 patients who were hospitalized for a heart attack within one year of a laboratory-confirmed influenza diagnosis. "But the flu poses the highest risk".

"I always say naw, I don't want a flu shot and something hit me", he said.

DOCTOR'S ORDERS Think you've got Aussie flu? "Some people who get vaccinated are still going to get influenza".

"It's a much more rigorous study that allows us to make a much more specific link between flu infection and heart issues", said Richard Webby, a prominent flu researcher at St. Jude Children's Research Hospital in Memphis.

"What's different in Canada is that we're seeing H3N2 season now, which is at its peak and we're also seeing the influenza B infection at the same time".

The researchers cautioned that the people in their study were not suffering from mild flu symptoms.

"That's the main culprit", said Dr. Mohammad Madjid, a cardiologist and flu researcher at Houston's University of Texas Health Science Center.



Like this

loading...
loading...

Latest


25 January 2018
Singapore Airlines cancels its Wellington flights via Canberra
Singapore Airlines (SIA) unveiled a new service that will connect Singapore and Melbourne to New Zealand capital Wellington. A four-times weekly Singapore-Melbourne-Wellington service will then begin on 3 May, where it will use 777-200ERs.

25 January 2018
Local Volunteers Conduct "Point-In-Time" Homeless Count
In addition, the volunteers will visit camps where there might be homeless persons, she added. The count began just after midnight and was to continue until just before midnight Wednesday.

25 January 2018
IShares Core Aggressive Allocation (AOA) Rises 0.16% for Jan 23
With so much data to track, traders may need to decide which information they will use when making the big investing decisions. Narrowing in a bit closer, the 5 month price index is 1.16449, the 3 month is 1.07770, and the 1 month is now 1.03573.

25 January 2018
Daniel Cormier Reveals Exact Date By Which He'll Retire From UFC
Longtime fighter and former champion Vitor Belfort has announced his intention to retire several times but keeps fighting. I've said time and time again that I've lived a great life in sports, I've loved every moment of it. "I'm like an onion".

25 January 2018
Oprah Winfrey visits grave of rape victim Recy Taylor
The talk show host wrote: 'I don't believe in coincidences, but if I did this would be a powerful one. She told NBC that she did not know Winfrey had plans of visiting the grave.

25 January 2018
Canalys: Xiaomi pips Samsung for first place in India
As for Samsung, it lost share in the critical market of phones costing INR 15,000 or less ($240/€190) and that cost it its leading position.

25 January 2018
Nintendo Mobile App Miitomo Shutting down Later This Year
If you want to save any Miifotos, you must save them to your smart device before May 9, 2018 at 12:00 a.m. They can then be transferred to Mii Maker on the Nintendo 3DS ™ family of systems or the Wii U™ console.

25 January 2018
Respect cultures of all regions: Pawan Kalyan
Pawan also called on his followers, to respect cultures and languages of all regions, saying that it would keep the nation united. It was in this town that he had a narrow escape when a high-tension wire fell on him during campaigning in the 2009 elections.

25 January 2018
Warriors vs. Knicks on Tuesday night
The Knicks have depth at center and Hernangomez is young (23) and has an affordable contract through next season. Having won nine out of their last 10 games prior to the loss, the Warriors looked to right the ship once again.

25 January 2018
Neymar Loved By PSG Fans Insists Unai Emery
And according to Spanish publication Don Balon , Neymar has made his intention to leave clear to his global team-mate Coutinho. Neymar, who arrived last summer and scored those four goals against lowly Dijon - was absent with no real valid reason.