Comorbidities: Hypertension and cardiovascular comorbidities

Hypertension and cardiovascular comorbidities

From the beginning of the pandemic, hypertension and/or cardiovascular disease (CVD) have been identified as potential risk factors for severe disease and death (Table 1). However, all studies were retrospective, included only hospitalized patients and did not distinguish between uncontrolled and controlled hypertension or used different definitions for CVD. Multivariate analyses adjusting for confounders were performed in only a few studies. Moreover, different outcomes and patient groups were analyzed. According to some experts, current data do not necessarily imply a causal relationship between hypertension and severity of COVID-19. There is no study that demonstrates the independent predictive value of hypertension. It is “unclear whether uncontrolled blood pressure is a risk factor for acquiring COVID-19, or whether controlled blood pressure among patients with hypertension is or is not less of a risk factor” (Schiffrin 2020). The same applies to CVD, with the difference that the numbers here are even lower.


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From a mechanistic point of view, however, it seems plausible that patients with underlying cardiovascular diseases and pre-existing damage to blood vessels such as artherosclerosis may face higher risks for severe diseases. During recent weeks, it has become clear that SARS-CoV-2 may directly or indirectly attack the heart, kidney and blood vessels. Various cardiac manifestations of COVID-19 do occur contemporarily in many patients (see chapter Clinical Manifestations, page xxx). Infection may lead to cardiac muscle damage, blood vessel constriction and to elevated levels of inflammation-inducing cytokines. These direct and indirect adverse effects of the virus may be especially deleterious in those with already established heart disease. During the next months, we will learn more about the role and contributions of arteriosclerosis in the pathogenesis of COVID-19.

 

Table 1. Hypertension in larger cohort studies, prevalence and outcome
Study Setting Hypertension present? Multivariate, hazard or odds ratio (95% CI) for endpoint
Wang 2020 344 ICU pts,
Tongji, China
Survivors vs Non-Survivors: 34 vs 52% Not done
Grasselli 2020 521 ICU pts,
72 hospitals in Italy
Discharge from ICU vs death at ICU: 40 vs 63% Not done
Guan 2020 1,099 hospitalized pts, 522 hospitals in China Non-severe disease vs severe: 13 vs 24% Not done
Zhou 2020 191 hospitalized pts from Jinyintan and Wuhan Survivors vs Non-Survivors: 23 vs 48% Not done
Shi 2020 487 hospitalized pts
in Zhejing Province
Non-severe disease at admission vs severe:
17 vs 53%
OR 2.7 (1.3-5.6) for severe disease at admission
Guan 2020 1,590 hospitalized pts, 575 hospitals in China Non-severe vs severe courses: 13 vs 33% HR 1.6 (1.1-2.3) for severe course (ICU, IMV, death)
Goyal 2020 393 hospitalized pts,
2 hospitals in New York
No IMV vs IMV during stay: 48 vs 54% Not done

IMV invasive mechanical ventilation, ICU intensive care units

 

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Treatment of hypertension during the pandemic

There has hardly been a topic that has kept doctors and their patients as busy as the question of whether antihypertensive drugs such as ACE inhibitors (ACEIs) or angiotensin-receptor blockers (ARBs) can cause harm to patients. The uncontrolled observations of increased mortality risk in patients with hypertension, CVD (see above) and diabetes raised concerns. These conditions share underlying renin-angiotensin-aldosterone system pathophysiology that may be clinically insightful. In particular, activity of the angiotensin-converting enzyme 2 (ACE2) is dysregulated (increased) in cardiovascular disease (Vaduganathan 2020). As SARS-CoV-2 cell entry depends on ACE2 (Hoffmann 2020), increased ACE2 levels may increase the virulence of the virus within the lung and heart.

ACEIs or ARBs may alter ACE2, and variation in ACE2 expression may in part be responsible for disease virulence. However, the first substantial study to examine the association between plasma ACE2 concentrations and the use of ACEIs/ARBs did not support this hypothesis: in two large cohorts from the pre-COVID-19 era, plasma concentrations of ACE2 were markedly higher in men than in women, but not with ACEI/ARB use (Sama 2020). A recent review of 12 animal studies and 12 human studies overwhelmingly implies that administration of both drug classes does not increase ACE2 expression (Sriram 2020).

However, some concerns on deleterious effects remain and some media sources and even scientific papers have called for the discontinuation of these drugs. This is remarkable as clinical data actually points in the opposite direction. Although all were observational (with the possibility of confounding), their message was consistent – none showed any evidence of harm.

  • Among 2573 COVID-19 patients with hypertension from New York City, there were no differences in the likelihood for severe COVID-19 for different classes of antihypertensive medications – ACE inhibitors, ARBs, beta blockers, calcium channel blockers, and thiazide diuretics (Reynolds 2020).
  • Comparing 6272 Italian cases (positive for SARS-CoV-2) to 30,759 controls (matched for sex, age, and municipality of residence), no evidence was found that ACE inhibitors or ARBs modify susceptibility to COVID-19 (Mancia 2020). The results applied to both sexes as well as to younger and older persons.
  • In a retrospective study from Denmark (one of the countries with the best epidemiological data) of 4480 COVID-19 patients, prior ACEI/ARB use, compared with no use, was not significantly associated with mortality. In a nested case-control study of a cohort of 494,170 patients with hypertension, use of ACEI/ARB, compared with use of other antihypertensive medications, was not significantly associated with COVID-19 diagnosis (Fosbøl 2020).

In conclusion, ACE inhibitors and/or ARBs should not be discontinued. Several randomized trials plan to evaluate ACEIs and ARBs for treatment of COVID-19 (Mackey 2020). According to a brief review, adjuvant treatment and continuation of pre-existing statin therapy could improve the clinical course of patients with COVID-19, either by their immunomodulatory action or by preventing cardiovascular damage (Castiglion 2020). In a retrospective study on 13,981 patients in Hubei Province, China, the use of statins was independently associated with lower all-cause mortality (5.2% versus 9.4%). Randomized controlled trials involving statin treatment for COVID-19 are needed.

Treatment of coronary heart disease during the pandemic

Pre-existing cardiovascular disease is linked with higher morbidity and mortality in patients with COVID-19, whereas COVID-19 itself can induce myocardial injury, arrhythmia, acute coronary syndrome and venous thromboembolism (nice review: Nishiga 2020). Myocardial injury, evidenced by elevated cardiac biomarkers, was recognized among early cases and myocardial infarction (STEMI or NSTEMI) and may represent the first clinical manifestation of COVID-19. Of note, a culprit lesion is often not identifiable by coronary angiography. In a study of 28 patients with STEMI, this was the case in 39% (Stefanini 2020). According to the authors, a dedicated diagnostic pathway should be delineated for COVID-19 patients with STEMI, aimed at minimizing procedural risks and healthcare providers’ risk of infection. There are already preliminary reports on a significant decline of 32% in the number of percutaneous coronary interventions for acute coronary syndromes (Piccolo 2020). Other authors have suggested that, in settings with limited resources to protect the work force, fibrinolytic therapies may be prefered over primary percutaneous coronary interventions (Daniels 2020).


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Of note, several studies have found a spectacular drop in admissions for STEMI during the peak of the epidemic. In France a steep decline of 25% was found for both acute ( < 24hrs) and late presentation (> 24 hrs) STEMI (Rangé 2020). Similar observations have been made in Italy (De Filippo 2020) and the US (Solomon 2020). Possible explanations for this phenomenon may be patients’ fear of coming to the hospital or disturbing busy caregivers, especially in the case of mild STEMI clinical presentation. Other hypothetical reasons are reduced air pollution, better adherence to treatment, limited physical activity or absence of occupational stress during lockdown. However, there is some evidence that the lower incidence does not reflect a true decline but just one more collateral damage of the pandemic. For example, Italian researchers have found a 58% increase of out-of-hospital cardiac arrests in March 2020 compared to the same period in 2019 (Baldi 2020). In New York, this increase seemed to be even more pronounced (Lai 2020). Others have observed an increased observed/expected mortality ratio during the early COVID-19 period indicating that patients try to avoid hospitalization (Gluckman 2020).

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