Hypertension, or high blood pressure, is highly prevalent in the United States and beyond. As the COVID-19 pandemic continues, researchers are keen to understand whether hypertension or the drugs that treat it might interact with the virus.
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To date, the novel coronavirus, SARS-CoV-2, has reached every continent on Earth other than Antarctica. The disease that it causes — COVID-19 — has led to the deaths of thousands of people.
Risk factors are of particular interest to both scientists and the public alike.
Over recent weeks, medical experts have published hundreds of papers examining every aspect of the disease. A recent commentary that appears in the American Journal of Hypertension looks at hypertension.
Overall, the authors conclude that, as it stands, there is no firm evidence that hypertension or blood pressure drugs will increase a person’s risk of contracting SARS-CoV-2. Similarly, current evidence does not support the theory that individuals with hypertension are more likely to experience worse symptoms of COVID-19 should they contract the virus.
Studies have demonstrated that certain existing conditions are associated with an increased risk of contracting SARS-CoV-2 and with more severe symptoms of COVID-19.
For instance, a
Another study, which appears in
However, these associations between hypertension and COVID-19 are not necessarily causal. As the authors of the recent commentary explain:
“[H]ypertension is exceedingly frequent in the elderly, and older people appear to be at particular risk of being infected with SARS-CoV-2 virus and of experiencing severe forms and complications of COVID-19.”
In the JAMA study, the average age of individuals who developed ARDS was 58 years compared with 48 years in those who did not develop ARDS. In short, the questions surrounding hypertension and COVID-19 risk need further investigation.
For people with hypertension, doctors sometimes prescribe angiotensin converting enzyme (ACE) inhibitors and angiotensin receptor blockers (ARBs). These medications belong to a group of drugs called renin-angiotensin-aldosterone system (RAAS) antagonists.
These drugs inhibit the RAAS and interrupt activity at a receptor called ACE2. Scientists have shown that SARS-CoV-2 binds to ACE2 receptors to facilitate its entry into lung cells. This coincidence raises some intriguing questions.
There is some evidence that ACE inhibitors and ARBs increase the number of ACE2 receptors. As the authors explain, this “could theoretically increase the binding of SARS-CoV-2 to the lung and its pathophysiological effects, leading to greater lung injury.” In other words, if these drugs increase the number of entry points for the virus, they might cause more severe symptoms.
However, in opposition to this theory, some
If this is the case, the drugs “could diminish the potential for development of either acute respiratory distress syndrome, myocarditis, or acute kidney injury, which can occur in COVID-19 patients.”
In fact, some researchers have
Other researchers have
To date, however, researchers have not tested these approaches in people.
As it stands, official bodies recommend continuing medication for hypertension. For instance, the Heart Failure Society of America, the American College of Cardiology, and the American Heart Association
Overall, many questions remain. As of yet, there is not enough evidence to conclude definitively that high blood pressure increases COVID-19 risk. As for hypertension medications, they might ward off SARS-CoV-2, make COVID-19 worse, or not influence the infection at all. The authors of the new commentary conclude:
“[T]here is, as yet, no evidence that hypertension is related to outcomes of COVID-19 or that ACE inhibitor or ARB use is harmful, or, for that matter, beneficial, during the COVID-19 pandemic.”
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