Found this info online so take it for what it's worth. Not a doctor, so if there's one on this board that finds something here in error feel free to correct:

Why does COVID-19 pose such a high risk to people with cardiovascular conditions?
There is a lot that is not yet known about the new coronavirus, which infects the lungs, but the ACC reports that in one study of patients hospitalized with COVID-19, 16.7 percent developed heart arrhythmias and 7.2 percent experienced acute injuries to their hearts, along with other COVID-19 related complications. The ACC also reports that, “there have been reports of acute cardiac injury, arrhythmias, hypotension, tachycardia, and a high proportion of concomitant cardiovascular disease in infected individuals, particularly those who require more intensive care.”
Studies from Wuhan, China — the epicenter of the pandemic – have reported that people with the virus have suffered heart attacks, inflammation of the heart, and even cardiac arrest, adds the ACC. The rate of cardiac complications in those with COVID-19 parallels those that occur in people with other types of coronaviruses, such as Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS), as well as those people who catch seasonal flu. No studies have yet been done to compare the rates of heart complications in COVID-19 patients with and without pre-existing CVD.
A few factors could explain why people with heart disease are at increased risk for severe illness if they catch COVID-19. First of all, any infectious disease increases inflammation in the body as one of the immune system’s defenses against invading pathogens. The result is a “blood storm” of inflammation coursing through the body’s more than 60,000 miles of blood vessels. In people who have arterial disease (plaque), inflammation can ignite a plaque rupture, much like a volcano erupting. This can lead to the formation of an obstructive blood clot, potentially followed by a heart attack or a stroke. Think of plaque as kindling. Inflammation is what lights the match.
High blood pressure also contributes to the development of atherosclerosis, while having type 2 diabetes elevates risk for a heart attack as much as having had a prior heart attack does in a non-diabetic person of the same age! Because COVID-19 often causes shortness of breath, which is turn quickens the pulse, both the lungs and the heart have to work harder when people catch the virus. But if your heart is already weakened by CVD or you have narrowing of the arteries, then your heart has to pump much harder than that of a healthy person to circulate blood and oxygen through your body.
What special precautions should patients with heart disease take?
The CDC, the American Heart Association and the BaleDoneen Method advise patients with CVD to get vaccinated for the flu and bacterial pneumonia. Influenza is so strongly linked to an increased risk for heart attacks and strokes in people with atherosclerosis that some experts have theorized that flu is a direct cause of these events, largely driven by associated rises of infection-induced inflammation in people with influenza.
Indeed, a 2018 study published in New England Journal of Medicine reported that within one week of catching the flu, people are at six times higher risk for a heart attack! Conversely, flu shots reduce risk for heart attacks and strokes by 61 percent for one full year after getting vaccinated, according to a recent analysis of studies of more than 7,000 people! Similarly, getting vaccinated against bacterial pneumonia has also been shown to lower risk for CV events.
Right now, the flu season is the U.S. continues to cause high rates of the disease, with about 440,000 Americans hospitalized and almost 8.2 percent of them dying, according to the CDC. Influenza has also been linked to increased risk for heart failure in people with CVD, adding another important reason to get vaccinated today if you haven’t already done so. While the shot won’t prevent COVID-19, it can also help keep you out of the doctor’s office or hospital with flu symptoms — enabling you to avoid being exposed to people who may have COVID-19 or other contagious conditions.