ÐÇ¿Õ´«Ã½

Coronavirus

    • New study provides reassuring data on rare heart condition after COVID-19 vaccination

    Share

    A new study has provided reassuring data on the rare heart condition that some people developed after receiving a COVID-19 vaccine, finding that clinical outcomes of myocarditis or myopericarditis were predominantly mild and generally similar between vaccinated and unvaccinated individuals.

    The study, entitled “SARS-CoV-2 vaccination and myocarditis or myopericarditis: population based cohort study,†was published in the .

    Myocarditis is the inflammation of the heart muscle and myopericarditis is the inflammation of the outer lining of the heart. Both are serious but rare conditions usually trigged by a viral, bacterial or fungal infection.

    Recent reports and studies have indicated an increased risk of heart inflammation after receiving a mRNA vaccine, especially after a second dose, leading to adding updates to the labels of both Moderna and Pfizer’s vaccines, or taking them off the table for certain populations.

    However, no study has investigated the association of mRNA COVID-19 vaccinations and myocarditis or myopericarditis using information from a complete population, according to a release.

    In a first-of-its-kind study, Danish researchers used national health-care data to look for links between mRNA vaccination and a hospital diagnosis of both rare heart conditions, increased blood troponin levels -- a measure of heart damage -- and a hospital stay lasting more than 24 hours.

    The study included nearly five million Danish residents aged 12 years and older who received either the Pfizer or Moderna vaccine, monitoring participants from Oct.1, 2020 to Oct. 5, 2021. Researchers took into account mitigating factors such as age, sex, vaccine priority grouping and any underlying health conditions.

    Researchers did not include participants who received two different COVID-19 vaccines nor those who had a positive COVID-19 test to avoid associating outcomes from SARS-CoV-2 infection with vaccination.

    In the follow-up period, researchers logged 269 participants who developed myocarditis or myopericarditis, 108 (or 40 per cent) of whom were between the ages of 12 to 39 years-old and 196 (73 per cent) were male.

    Overall results showed a strong association with Moderna and myocarditis or myopericarditis, defined “as the combined outcome of a hospital diagnosis of either heart condition, increased troponin levels and a hospital stay longer than 24 hours.â€

    The Pfizer vaccine was only associated with an increased rate of the rare heart conditions amongst women.

    Overall, individuals vaccinated with Pfizer had a “non-significantly increased rate†of myocarditis or myopericarditis in the 28 days after vaccination compared with unvaccinated follow-up after adjustment for age, sex, vaccine priority group, season, and clinical comorbidities, according to the study. Among participants aged 12 to 39 years old, the study found a “non-significantly increased rate†in the 28 days after vaccination compared with unvaccinated follow-up.

    The rate of myocarditis or myopericarditis was higher for Moderna vaccination than with Pfizer, but researchers observed “no readmissions, diagnoses of heart failure or deaths among people with myocarditis or myopericarditis occurring within 28 days†of a Moderna vaccination.

    However, the “absolute number of events†after either vaccine was low, even in younger age groups, and cases were predominantly mild – providing further evidence to support the overall safety of mRNA vaccines for COVID-19.

    For example, the release states, out of 3.4 million individuals vaccinated with Pfizer, 48 developed myocarditis or myopericarditis within 28 days of vaccination, a rate of 1.4 per 100,000.

    Among women, the rate of developing the rare heart conditions with Pfizer was 1.3 per 100,000 compared 1.5 per 100,000 in men.

    Among the 12 to 39 age group, the rate was 1.6 per 100,000 and in the youngest cohort of 12 to 17 year-olds, it was only one per 100,000 within 28 days of receiving a Pfizer vaccine.

    Out of 498,814 individuals vaccinated with Moderna, 21 developed myocarditis or myopericarditis within 28 days of vaccination, a rate of 4.2 per 100,000.

    For Moderna, the rate of developing the rare heart conditions for women was two per 100,000 compared to 6.3 per 100,000 in men. Among the 12-to-39 age group, the rate was 5.7 per 100,000 within 28 days of receiving a Moderna vaccine.

    Both vaccines were associated with approximately a 50 per cent reduced risk of cardiac arrest or death, the most severe outcome from myocarditis or myopericarditis, the researchers said.

    In contrast, researchers found a 14-fold increased risk of cardiac arrest or death 28 days after a positive COVID-19 test, compared with uninfected individuals.

    The researchers are calling for larger multinational studies on the subject to specify risks of the rare heart conditions within smaller subgroups and the risk of myocarditis or myopericarditis after COVID-19 infection versus vaccination. 

    CTVNews.ca ÐÇ¿Õ´«Ã½

    The province's public security minister said he was "shocked" Thursday amid reports that a body believed to be that of a 14-year-old boy was found this week near a Hells Angels hideout near Quebec City.

    Since she was a young girl growing up in Vancouver, Ginny Lam says her mom Yat Hei Law made it very clear she favoured her son William, because he was her male heir.

    An Ontario man says it is 'unfair' to pay a $1,500 insurance surcharge because his four-year-old SUV is at a higher risk of being stolen.

    The Montreal couple from Mexico and their three children facing deportation have received a temporary residence permit.

    For the last seven-and-half months, Toronto resident Heather McArthur has been living out what she describes as her 'worst nightmare.' On Feb. 7, her then three-year-old son Jacob along with his father Loc Phu 'Jay' Le departed for what was supposed to be a week-long visit to Vietnam to celebrate the Lunar New Year with family, McArthur says.

    Canada

    • Since she was a young girl growing up in Vancouver, Ginny Lam says her mom Yat Hei Law made it very clear she favoured her son William, because he was her male heir.

    • In the middle of the small crowd — near the tents, the lineup of kids awaiting face painting, the snack table — stood a jubilant Chiara Padovani. 'When I say 'tenant, you say 'power,'' she commanded to several dozen tenants, who chanted back with gusto. What looked like a summer block party in front of two north-end Toronto apartment buildings last month was a celebration of what renters who withheld payments for months called a 'huge victory.'

    • For the last seven-and-half months, Toronto resident Heather McArthur has been living out what she describes as her 'worst nightmare.' On Feb. 7, her then three-year-old son Jacob along with his father Loc Phu 'Jay' Le departed for what was supposed to be a week-long visit to Vietnam to celebrate the Lunar New Year with family, McArthur says.

    • The head of a committee monitoring the government's response to the inquiry into the 2020 Nova Scotia mass killing says she's pleased with progress made so far.

    • The University of Ottawa's special advisor on antisemitism says he has resigned following posts he made on social media celebrating the pager explosions in Lebanon this week.

    • B.C.'s police watchdog is investigating the death of a woman who was shot by the RCMP after allegedly barricading herself in a room with a toddler early Thursday morning.

    World

    Politics

    Health

    Sci-Tech

    Entertainment

    • Lawyers representing the producers of 'Russians at War' say they may pursue legal action against Ontario's public broadcaster for pulling support for the controversial documentary amid outcry from the Ukrainian community and some Canadian politicians.

    • Viewers of Jeopardy got a chance to test their knowledge of trivia about B.C.'s biggest city Wednesday night.

    Business

    Lifestyle

    • They say a dog is a man’s best friend. In the case of Darren Cropper, from Bonfield, Ont., his three-year-old Siberian husky and golden retriever mix named Bear literally saved his life.

    Sports

    • Vancouver Canucks goalie Thatcher Demko says he's been working his way back from a rare lower-body muscle injury since being sidelined in last season's playoffs.

    • Toronto Blue Jays shortstop Bo Bichette returned to the 10-day injured list Thursday due to a right middle finger fracture.

    Autos

    • An Ontario man says it is 'unfair' to pay a $1,500 insurance surcharge because his four-year-old SUV is at a higher risk of being stolen.

    • Video of a brazen daylight auto theft which shows a suspect running over a victim in a stolen luxury SUV has been released by police west of Toronto.

    • The plant was expected to produce batteries for a million electric vehicles a year. Once up and running, it was supposed to create hundreds of permanent jobs in a small southeastern Ontario municipality. But two years later, spending on the construction of the Umicore plant has been delayed in what the company calls a "significant worsening of the EV market context."

    Local Spotlight

    They say a dog is a man’s best friend. In the case of Darren Cropper, from Bonfield, Ont., his three-year-old Siberian husky and golden retriever mix named Bear literally saved his life.

    A growing group of brides and wedding photographers from across the province say they have been taken for tens of thousands of dollars by a Barrie, Ont. wedding photographer.

    Paleontologists from the Royal B.C. Museum have uncovered "a trove of extraordinary fossils" high in the mountains of northern B.C., the museum announced Thursday.

    The search for a missing ancient 28-year-old chocolate donkey ended with a tragic discovery Wednesday.

    The Royal Canadian Mounted Police is celebrating an important milestone in the organization's history: 50 years since the first women joined the force.

    It's been a whirlwind of joyful events for a northern Ontario couple who just welcomed a baby into their family and won the $70 million Lotto Max jackpot last month.

    A Good Samaritan in New Brunswick has replaced a man's stolen bottle cart so he can continue to collect cans and bottles in his Moncton neighbourhood.

    David Krumholtz, known for roles like Bernard the Elf in The Santa Clause and physicist Isidor Rabi in Oppenheimer, has spent the latter part of his summer filming horror flick Altar in Winnipeg. He says Winnipeg is the most movie-savvy town he's ever been in.

    Edmontonians can count themselves lucky to ever see one tiger salamander, let alone the thousands one local woman says recently descended on her childhood home.

    • B.C.'s police watchdog is investigating the death of a woman who was shot by the RCMP after allegedly barricading herself in a room with a toddler early Thursday morning.

    • Since she was a young girl growing up in Vancouver, Ginny Lam says her mom Yat Hei Law made it very clear she favoured her son William, because he was her male heir.

    • The 'Namgis First Nation says a fish farm it owns near Port McNeill shows the potential of land-based aquaculture in B.C.

    • For the last seven-and-half months, Toronto resident Heather McArthur has been living out what she describes as her 'worst nightmare.' On Feb. 7, her then three-year-old son Jacob along with his father Loc Phu 'Jay' Le departed for what was supposed to be a week-long visit to Vietnam to celebrate the Lunar New Year with family, McArthur says.

    • An Ontario man says it is 'unfair' to pay a $1,500 insurance surcharge because his four-year-old SUV is at a higher risk of being stolen.

    • In the middle of the small crowd — near the tents, the lineup of kids awaiting face painting, the snack table — stood a jubilant Chiara Padovani. 'When I say 'tenant, you say 'power,'' she commanded to several dozen tenants, who chanted back with gusto. What looked like a summer block party in front of two north-end Toronto apartment buildings last month was a celebration of what renters who withheld payments for months called a 'huge victory.'

    • Defence counsel for accused murderer John-Christopher Arrizza argues he was in an “altered state of mind†due to days of drug and alcohol use, sleep deprivation and not eating, when he fatally stabbed a man at a Banff nightclub in 2022.

    • The Parole Board of Canada says a man who assaulted a young pregnant woman and left her for dead remains too dangerous to be released into the community.

    • Five bison are dead at Elk Island National Park east of Edmonton following an early Thursday morning collision.

    • BREAKING NEWS

      BREAKING NEWS

      A man has been taken to hospital in life-threatening condition following a stabbing incident that happened on Baseline Road in the early hours of Friday morning, according to the Ottawa Paramedic Service.

    • Police say a man who was taken to hospital in critical condition after being shot Thursday night has died.

    • Higher than average temperatures are in the forecast for Ottawa this Friday.

    • The Montreal couple from Mexico and their three children facing deportation have received a temporary residence permit.

    • The province's public security minister said he was "shocked" Thursday amid reports that a body believed to be that of a 14-year-old boy was found this week near a Hells Angels hideout near Quebec City.

    • Premier François Legault's approval rating continued to rise this summer, according to the Angus Reid Institute. After reaching a low at the end of 2023, his support rose by three percentage points over the summer to 39 per cent.

    • Five bison are dead at Elk Island National Park east of Edmonton following an early Thursday morning collision.

    • A mother and daughter say they woke up to flames encroaching on their third-floor apartment near Commonwealth Stadium early Friday morning.

    • An Edmonton man who is charged with sexually assaulting a teen boy is a member of the Alberta sheriffs, CTV News Edmonton has confirmed.

    • Gas prices increased in all three Maritime provinces for the first time in more than a month.

    • A Nova Scotia woman has applied for a medically assisted death, saying after years of battling to receive out-of-country surgery for an illness that causes "indescribable" pain, she struggles to maintain the will to live.

    • A section of Herring Cove Road in the Spryfield area of Halifax is closed to traffic in both directions following a single-vehicle collision Friday morning.

    • Manitobans are continuing to mop up after a deluge of rain hit southern Manitoba earlier in the week.

    • Shamattawa RCMP are searching for a missing six-year-old boy who hasn’t been seen since Wednesday morning.

    • A Winnipeg pet rescue is putting out a warning to dog owners across the city about a possible parvovirus in the province.

    • A social media post of purple apples “growing†in Saskatchewan has sparked a lot of attention. However, garden experts say there's no such thing.

    • A case involving stolen funds from a Saskatchewan business being used to purchase cryptocurrency will be heading back to the courts, thanks to a new decision by Saskatchewan's Court of Appeal.

    • Environment and Climate Change Canada (ECCC) has confirmed a tornado touched down Wednesday evening near Langbank, Sask.

    • Amber and Adam Brueckner have a pool-shaped hole in their backyard – and their wallets.

    • New details have been shared about a missing family that was last seen on Sept. 1 in Kitchener, Ont.

    • Police are trying to identify a man who approached a woman and child in Wellesley.

    • A gym teacher at a private Christian school in Saskatoon has been charged. Terra MacEwan, 44, is charged with assault with a weapon. A Saskatoon mother who spoke with CTV News says her autistic son was MacEwan's victim.

    • Thomas Hamp says he believed secret police were out to kidnap, torture, and kill him when he fatally stabbed his girlfriend Emily Sanche in February of 2022.

    • A social media post of purple apples “growing†in Saskatchewan has sparked a lot of attention. However, garden experts say there's no such thing.

    • As northern Ontario gets ready to welcome autumn this weekend, it’s still feeling a lot like summer as provincial forest fire crews continue to battle blazes.

    • An Ontario man says it is 'unfair' to pay a $1,500 insurance surcharge because his four-year-old SUV is at a higher risk of being stolen.

    • James Bay Ontario Provincial Police have charged four commercial vehicle drivers with impaired, including one who was hauling 36,000 kilograms of ammonia hydrate.

    • Police say just before 7:00 p.m. four teens entered a business in the 1000 block of Adelaide Street North.

    • Police were focusing their attention on the northeast corner of Richmond and Horton, with members of the emergency response unit taking up positions at the scene.

    • Shedden, southwest of London, hasn’t changed much in decades – but word is spreading that hundreds of new residents could soon be calling the town home.

    • Two men from Barrie have been charged after a deadly shooting at a park in Keswick on Wednesday.

    • A growing group of brides and wedding photographers from across the province say they have been taken for tens of thousands of dollars by a Barrie, Ont. wedding photographer.

    • Ontario Provincial Police executed a search warrant in Walkerton.

    • On Thursday, just after 9:30 a.m., a man was found and taken to police headquarters, where he was released with conditions and a future court date.

    • Standing up, speaking out, and showing solidarity — survivors and supporters gathered in the core to take back the night in Windsor. The city is just one of a growing list of communities that have declared intimate partner violence (IPV) an epidemic.

    • The Windsor Police Service (WPS) has seized over $56,000 in drugs and have arrested one suspect.

    • In a rare move, the Greater Victoria School District Board of Education has been slapped with a ministerial order from the province requiring it to update a student safety plan – drawing concern around political posturing leading up to an election.

    • The Union of B.C. Municipalities is asking the provincial government to make transit free for teenagers.

    • To appreciate why Mimi Vandermolen is so pleased to notice one particular vehicle she’s walking past, you need to know that seeing this many cars in one place would have been unimaginable when she was growing-up in the post-war Netherlands.

    • A pair of runaway pigs are in the custody of an animal sanctuary in the Okanagan after evading police and volunteers for hours earlier this week.

    • The Red Bridge, a historic landmark in Kamloops, B.C., was completely destroyed by fire early Thursday morning.

    • Animal protection officers in British Columbia have rescued three pit bulls – including one that gave birth to 10 puppies – from a rat-infested home in Kelowna.

    • A Vulcan, Alta., man has been charged with a Lethbridge woman's murder after her body was found in the Oyen area.

    • A Lethbridge couple got a good reminder as to why you should keep your vehicle doors locked at all times.

    • Lethbridge residents who live near the police range can expect to hear plenty of shots fired Wednesday and Thursday.

    • A new community health profile in the Algoma District shows the area is significantly below provincial averages in a number of health metrics.

    • North Bay Police Service says one person has died following an industrial accident at the Ontario Northland Transportation Commission Rail Yard on Tuesday.

    • Three northern Ontario residents are charged with drug trafficking after the vehicle they were in got stuck along a bush road off Highway 17 on Monday.

    N.L.

    Shopping Trends

    The Shopping Trends team is independent of the journalists at CTV News. We may earn a commission when you use our links to shop. Read about us.

    Stay Connected
    Follow CTV News