I noticed an article at the ABC last week by an Australian professor who developed a heart issue after Covid infection, and it was a bit of a worry:
Last month, US researchers shared the preliminary results of a study looking at the impacts of SARS-CoV-2 infection and reinfection in a cohort of more than 5 five million American veterans.
The researchers examined the health records of more than 250,000 people who had been infected once; 36,000 people who had been infected twice; and 2,000 people who had been infected three times.
They found that for every health outcome measured, the Hazard Ratio — a measure of how often something happens in one group compared to another — increased with each COVID-19 infection.
The risk of cardiovascular disease, for example, increased after one infection, but doubled in people who had two infections, and tripled in those who had been infected thrice.
The numbers translate into 50 extra cases of heart disease per 1,000 people who've had COVID-19 twice.
Unfortunately, vaccination didn't seem to help: the cumulative risk of heart disease was indistinguishable when the researchers split people who'd received two or more COVID-19 jabs and those who hadn't been vaccinated at all.
The researchers found similar cumulative risks with each reinfection for pulmonary disease, clotting and blood disorders, neurological disease, mental health problems, kidney disease, musculoskeletal disease, fatigue, and so on.
These problems occur most frequently in the first month after infection, but can emerge up to six months later.
Soon after, I checked my own blood pressure (I have a machine at home, but the GP also checked it), and was surprised to see that it was much higher than normal. Like, 150/95 on few occasions, although more often around 140/90. (It has also been back in a more comfortable range sometimes - I have been checking morning, noon and night for a few days now. Before this, and I usually would check once a month or so, I was usually at 120-125/85-90.)
Could this be due to Covid? Google says "yes":
A total of 211 consecutive COVID-19 patients who were admitted to Parkhayat Kutahya hospital were retrospectively screened. Information was obtained from the electronic medical records and National health data registry. The study outcome was new onset of hypertension according to the Eight Joint National Committee and European Society of Cardiology Guidelines. Finally, 153 confirmed COVID-19 patients (mean age 46.5 ± 12.7 years) were enrolled. Both systolic (120.9 ± 7.2 vs 126.5 ± 15.0 mmHg, P <.001) and diastolic BP (78.5 ± 4.4 vs 81.8 ± 7.4 mmHg, P <.001) were significantly higher in the post COVID-19 period than on admission. New onset hypertension was observed in 18 patients at the end of 31.6 ± 5.0 days on average (P <.001). These findings suggest that COVID-19 increases systolic and diastolic BP and may cause new onset hypertension.
That seems a pretty small study, but there is at least one other study indicating it may well be right.
There is a large American study noting that hypertension went up in a large group during the pandemic, but they talk mostly about whether it was caused by the stress and isolation (and lack of exercise) caused by the pandemic, rather than the virus directly. But there is still suspicion:
“The disease itself may cause high blood pressure because of the interaction with certain molecules like the angiotensin-converting enzyme receptors. Moreover, many of my patients called to tell me that once they got the vaccines — especially the first dose — their blood pressure went very high, and they ended up in A&E and casualty with systolic blood pressure exceeding 200 in some of them.”
“What is also interesting is that for many of [my patients], the blood pressure did not settle down and remained high — not as high as 200, but higher than it was before. I am doing some research now to look at the effects of vaccination on blood pressure. And I have at least nine patients who had the same reaction: [their] blood pressure went up, and they ended up in casualty at St George’s [hospital].”
“Since then, there have been two publications — oneTrusted Source from Lausanne in Switzerland and the second from Italy — that describe exactly this. Especially with the BioNTech vaccine, the blood pressure goes very high. What we don’t know is why this happens and why it does not settle down,” said Dr. Antonios.
Dr. Antonios also said there could be a connection between long COVID and hypertension. However, this required more research.
So, this is an incentive for me to actually start getting some exercise. And drinking beet juice. (There is a cheap juice mix which is half beet juice. Can't hurt.) I'll be watching my readings closely - I've got a blood pressure tracking app on my phone to help with that.