Two new studies from Germany paint a sobering picture of the toll that Covid-19 takes on the heart, raising the specter of long-term damage after people recover, even if their illness was not severe enough to require hospitalization.

One study examined the cardiac MRIs of 100 people who had recovered from Covid-19 and compared them to heart images from 100 people who were similar but not infected with the virus. Their average age was 49 and two-thirds of the patients had recovered at home. More than two months later, infected patients were more likely to have troubling cardiac signs than people in the control group: 78 patients showed structural changes to their hearts, 76 had evidence of a biomarker signaling cardiac injury typically found after a heart attack, and 60 had signs of inflammation.

These were relatively young, healthy patients who fell ill in the spring, Valentina Puntmann, who led the MRI study, pointed out in an interview. Many of them had just returned from ski vacations. None of them thought they had anything wrong with their hearts. 

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“The fact that 78% of ‘recovered’ [patients] had evidence of ongoing heart involvement means that the heart is involved in a majority of patients, even if Covid-19 illness does not scream out with the classical heart symptoms, such as anginal chest pain,” she told STAT. She is a cardiologist at University Hospital Frankfurt. “In my view, the relatively clear onset of Covid-19 illness provides an opportunity to take proactive action and to look for heart involvement early.” 

The other study, which analyzed autopsy results from 39 people who died early in the pandemic and whose average age was 85, found high levels of the virus in the hearts of 24 patients. 

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“We see signs of viral replication in those that are heavily infected,” Dirk Westermann, a cardiologist at the University Heart and Vascular Centre in Hamburg, said in an interview. “We don’t know the long-term consequences of the changes in gene expression yet. I know from other diseases that it’s obviously not good to have that increased level of inflammation.”

Taken together, the two studies, published Monday in JAMA Cardiology, suggest that in many patients, Covid-19 could presage heart failure, a chronic, progressive condition in which the heart’s ability to pump blood throughout the body declines. It is too soon to say if the damage in patients recovering from Covid-19 is transient or permanent, but cardiologists are worried.

“These are two studies that both suggest that being infected with Covid-19 carries a high likelihood of having some involvement of the heart. If not answering questions, [they] prompt important questions about what the cardiac aftermath is,” said Matthew Tomey, a cardiologist and assistant professor of medicine at the Icahn School of Medicine at Mount Sinai Health System in New York. He was not involved in either study. 

“The question now is how long these changes persist,” he added. “Are these going to become chronic effects upon the heart or are these — we hope —  temporary effects on cardiac function that will gradually improve over time?”

Since the pandemic began, people with underlying cardiovascular problems such as high blood pressure, coronary artery disease, or heart failure have been known to be at higher risk for infection and death. The connection between Covid-19 and blood clots emerged later, after doctors began connecting the pulmonary embolisms, strokes, and heart attacks they were seeing to the virus.

Cardiac problems in recovering patients could belong to a pattern of lingering symptoms. Tomey sees signs of weakness in patients who had Covid-19 in March or April, when the disease was surging in New York.

“Patients come to my office saying, ‘Hey, I’m a 31-year-old who used to run and be completely unlimited in my exercise, and now I get palpitations walking across the street. Or I get out of breath climbing up to my second-floor apartment,’” he said. “Individuals are exquisitely tuned in to their own capacity for exercise, so I take that very seriously. Our challenge is to understand the why.” 

Marc Pfeffer, a cardiologist at Brigham and Women’s Hospital in Boston, called both the autopsy and MRI studies a sobering warning. He was not involved in either. He’s concerned about relatively young people losing their cardiac health reserves, which typically decrease with age and can set the stage for heart failure.

“We knew that this virus, SARS-CoV-2, doesn’t spare the heart,” he said. “We’re going to get a lot of people through the acute phase [but] I think there’s going to be a long-term price to pay.”

In an editorial about the two studies, Clyde Yancy, a cardiologist at Northwestern’s Feinberg School of Medicine, and Gregg Fonarow, a cardiologist at UCLA’s Geffen School of Medicine, pushed for more research into the problem. 

“If this high rate of risk is confirmed, … then the crisis of COVID-19 will not abate but will instead shift to a new de novo incidence of heart failure and other chronic cardiovascular complications,” they wrote. “We are inclined to raise a new and very evident concern that cardiomyopathy and heart failure related to Covid-19 may potentially evolve as the natural history of this infection becomes clearer.” 

Asked if there is something that can be done for patients now, Mount Sinai’s Tomey said, “I would love to have the answer to that question.”

  • I have been suffering covid-19 in association with NSTMI, ALVF. After recovering covid19, i feel like left heart weakness, same to your patients

  • Thanks for this informative and sobering article. This may be a bit off-topic, but I’m wondering what role the strength of the immune system plays in Covid outcomes. What I’ve read would suggest that having a strong immune system might be an advantage in keeping Covid from progressing to a critical stage, but there seems to be evidence that an excessive immune response (suggesting a healthy immune system) coupled with widespread inflammation can, in some patients, precipitate cytokine storm, with life-threatening results. It sounds to me like a damned-if-you-do and damned-if-you-don’t proposition: a strong immune system offers benefits during the onset of the disease, but could be a liability if inflammation and viral load progress. As a cardiac patient and m.i. survivor I’m going to continue to keep my level of systemic inflammation as low as possible and hope that it’s the best strategy for beating Covid.

  • It is exactly what I am feeling, even doing home chores gets me breathless. I was an active person and enjoyed exercising. After that horrible February flu (still didn’t know Covid was in the US) nothing is the same.

  • Hopefully with further studies that these heart problems will resolve themselves with time and medical care.

  • Liz, thank you for running this. It is sad but not surprising. For years, we have seen isolated cases of “idiopathic cardiomyopathy” presenting in younger adults with no significant medical history other than a recent viral respiratory infection. I’ve never forgotten a 35 year old man when I was a resident, who went from health to heart transplant list in a few weeks! We need to get this message to the teens and young adults that are acting like this pandemic is no big deal. Most of us have tried to allay fears and prevent public panic, but we may have inadvertently given them a false sense of security. Great article to share with young people you know.

    • Totally JW, Some of the worse and rapidly decompensating HF patients I have seen in the ER were eventually diagnosed as viral cardiomyopathy. This virus, as many of us have known all along is not to be trifled with. All these foolish folks who listened to bad advice and tried to get “herd immunity” unfortunately may pay a price in the years to come.

  • Hi. I’m a 76 y/o male in Sydney AU. with some underlying health conditions including compromised platelets, enlarged spleen, anaemia, previous AF episodes etc.
    Otherwise I’m fit and healthy and carry on a normal life. I’m really afraid of Covid-19 so do a lot of reading about it. I followed the link above on Covid-19 and blood clots and found it a bit lacking in information. I’ve found three sites that have lots of relevant information about blood clotting and also ways to deal with that. I’m posting these here because I think they are really important to share. I’ve told my wife if I get Covid-19 make sure the Dr knows about this information.
    https://www.emsworld.com/article/1224381/spotting-clotting-hypercoagulopathy-covid-19
    https://www.coronavirusmonitor.co.za/news/watch-cape-doctor-says-covid-19-is-not-a-lung-disease/
    https://www.washingtonpost.com/health/2020/07/01/coronavirus-autopsies-findings

  • You might want to mention that one of your OWN Boston Red Sox pitchers now has Myocarditis after a bout of Covid. Elite athletes get it too.

  • ..Time is up. Covid-19 should no longer be called a ‘respiratory-virus’, it has been established as a ‘full-body’ virus.

    It enters through the lungs & attacks major organs, including the nervous system. THAT needs to be pushed to media organizations, it is not the ‘flu’ & it will be a lifelong infection YOU will have to pay for. Physically & financially, YOU will suffer the cost, not the politicians, not your friends, & not your coworkers.

    Wear a mask, stand apart, & pray researchers around the world generate a viable, safe vaccine.

  • This was very helpful. Another article of importance is in the Lancet E Clinical medicine. Dr Amy Rapkiewicz did autopsies on people of varying ages who died of Covid. She and her associates found large bone marrow cells in the heart, liver and kidneys. Also acute tubular necrosis. They said thrombosis appears early in the disease.

  • This was a really nice and informative read. As someone who has had Covid and has a history of heart-related problems in the family, I’d also love to hear it if any experts come up with next-steps for those who’ve been infected and are now concerned about their heart health. Will stay tuned…thank you again!

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