Abstract
The novel coronavirus (CoV) severe acute respiratory syndrome (SARS)-CoV-2 outbreak began at the end of 2019 in Wuhan, China, and has spread to over 200 countries. In this multicenter retrospective study, we identified 2190 adult patients admitted for laboratory-confirmed COVID-19 in three participating centers. Multivariate logistic regression was conducted in patients with comorbid hypertension to examine the potential association between clinical outcomes, disease severity, and clinical characteristics with the use of ACEI, ARB, calcium-channel blockers (CCB), beta-blockers (BB), and thiazide diuretics. The clinical outcome, dyspnea, and fatigue were significantly improved in patients, especially elderly patients who were older than 65 years, who took ARB drugs prior to hospitalization compared to patients who took no drugs. The reduction of disease severity of elderly COVID-19 patients was associated with CCB and ACEI users. Clinical indices, including CRP, lymphocyte count, procalcitonin D dimer, and hemoglobin, were significantly improved in elderly ARB users. In addition, the clinical outcomes were statistically significantly improved in patients who took antihypertension drugs ARB, BB, and CCB after statistical adjustment by all ages, gender, baseline of blood pressures, and coexisting medical conditions. Our data indicate that hypertension drugs ARB, ACEI, CCB, and BB might be beneficial for COVID-19 patients.
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Introduction
At the end of 2019, a cluster of lethal pneumonia cases was reported in Wuhan, China. A SARS-CoV-like coronavirus in the respiratory tracts of patients was soon isolated and the viral genome sequenced; it was later named SARS-CoV-21,2,3,4,5,6. In severe cases of COVID-19, patients develop acute respiratory distress syndrome (ARDS) and often die with multiorgan dysfunction syndrome (MODS). By March 11, 2020, the virus infection had spread to over 100 countries, and SARS-CoV-2 infection was declared a global pandemic by the World Health Organization (https://www.who.int/news-room/detail/30-01-2020-statement-on-the-second-meeting-of-the-international-health-regulations-(2005)-emergency-committee-regarding-the-outbreak-of-novel-coronavirus-(2019-ncov)).
There has been growing concern about the use of antihypertensives in patients with COVID-19, mostly due to the fact that angiotensin-converting enzyme 2 (ACE2)1,3,4,7,8,9,10, a negative regulator of the renin–angiotensin–aldosterone system (RAAS), is a co-receptor for viral entry into human cells by SARS-CoV-2. ACE cleaves angiotensin I to generate angiotensin II, whereas ACE2 converts angiotensin II into angiotensin (1–7)11,12,13. By counteracting the action of ACE, ACE2 plays a crucial role in maintaining blood-pressure homeostasis, fluid, and salt balance14,15. ACE inhibitor (ACEI) and angiotensin receptor blockers (ARB) are the most commonly prescribed antihypertensive medications16,17,18,19. A viewpoint “COVID-19 and angiotensin-converting enzyme inhibitors and angiotensin receptor blockers, what is the evidence?” published on March 24, 2020 in JAMA pointed out that no clinical data are available20. In a special report “renin-angiotensin-aldosterone system (RAAS) inhibitors in patients with COVID-19” published on March 30, 2020 in the New England Journal of Medicine, the authors discussed the potential for benefit rather than harm of RAAS blockers in COVID-19, but also pointed out that insufficient data are available to determine whether these observations readily translate to humans, and no studies have evaluated the effects of RAAS inhibitors in COVID-1921.
A previous study from this research group investigated the role of RAAS in the acute lung failure caused by SARS-CoV-2 infection22. SARS-CoV-2 infection and the spike protein of SARS-CoV-2 reduce ACE2 expression, increase angiotensin II-level signaling through the angiotensin II type 1a receptor (AT1a), promote disease pathogenesis, induce lung edemas, and impair respiratory function9,12. We demonstrated that the ARB losartan could attenuate acute lung failure in a mouse model whose condition had been worsened after injection of the SARS-CoV-2 spike protein9. We also showed imbalanced RAAS in many predisposing conditions for ARDS, including sepsis, acid aspiration, bacteria, SARS-CoV-2, avian influenza (H5N1 and H7N9) infections, as well as nanoparticle aspiration9,11,12,13,23. These studies suggested that blocking the RAAS pathway and reducing angiotensin II levels could ameliorate lung injury9,11,12,16,23.
Observational studies have associated the use of ACEIs and ARBs with improved outcomes in patients with pneumonia24. Our previous study reported significantly elevated plasma levels of angiotensin II in COVID-19 patients8, again indicating RAAS imbalance in COVID-19. More studies of ACEI/ARBs associated with mortality and morbidity of COVID-19 reported different results recently25,26,27,28,29. Here, we conducted a retrospective study to examine the potential association between the use of antihypertensives and COVID-19 disease severity.
Results
Clinical characteristics of participants
This study cohort included 2190 patients with COVID-19 who were admitted to three hospitals in China. A total of 655 participants with hypertension were included in the subsequent analysis, and 19 cases were excluded due to missing medication information (Fig. 1). The mean (±SE) age was 64.6 ± 11.8 years, 51.8% of the patients were male (Supplementary Table S1), and 318 patients were >65 years of age (Supplementary Table S2). The distribution of age and sex among total severe (169, 25.8%) and nonsevere (486, 74.2%) COVID-19 patients was significantly different. Severe COVID-19 patients were older (69.6 ± 11.0 years vs 62.9 ± 11.5 years, P < 0.001) and more often men (60.4%, 102/169 vs 49%, 238/486, P = 0.012). Besides, nonsurvivors were significantly older than survivors (71.0 ± 10.9 years vs 64.2 ± 11.7 years, P < 0.001). No association between death and sex was found (P > 0.05). Among elderly patients (>65 years), patients who were older were more likely to develop severe COVID-19 and die. Men were more likely to develop severe COVID-19, but this had no statistically significant effect on mortality.
ARB and CCB are associated with decreased mortality in elderly COVID-19 patients
Using the multivariable logistic regression method, we evaluated the effects of hypertensive comorbidity patients who took antihypertensive drugs prior to hospitalizations, in subgroups, ARB, ACEI, CCB, Thiazide, and BB, on mortality and disease severity compared to a no-drug-used patient group with hypertension comorbidity (Tables 1, 2 and Supplementary Tables S3–S8). The clinical outcomes of ARB users were statistically significantly improved with the adjustment of age, gender, baseline of blood pressure, and coexisting medical condition variables among all patients (adjusted OR = 0.421, 95% CI: 0.19–0.934, P = 0.033), as well as in elderly patients who were more than 65 years of age (adjusted OR = 0.202, 95% CI: 0.055–0.745, P = 0.016) (Table 1 and Supplementary Tables S5, S6). The clinical outcomes of CCB users were statistically significantly improved in elderly patients (adjusted OR = 0.22, 95% CI: 0.062–0.778, P = 0.019) (Table 1 and Supplementary Table S6). Our data indicate that ARB and CCB might be beneficial to COVID-19 patients.
CCB and ACEI are associated with reduced disease severity in elderly COVID-19 patients
We observed statistically significant reductions of disease severity in CCB antihypertensive drug subgroups compared to no drug users after adjustment (adjusted OR = 0.472, 95% CI: 0.257–0.865, P = 0.015), especially in elderly patients (adjusted OR = 0.287, 95% CI: 0.114–0.723, P = 0.008) (Table 2 and Supplementary Tables S7, S8). The disease severity of ACEI users was statistically significantly reduced in elderly patients (adjusted OR = 0.156, 95% CI: 0.036–0.67, P = 0.013) (Table 2 and Supplementary Table S8). Statistically significant reductions in the odds of developing severe disease among ARB users compared to no drug users were observed without adjustment (Table 2). Thus, CCB and ACEI antihypertensive drugs might associate with disease severity in COVID-19 patients.
ARB associated with the reductions of dyspnea and fatigue in COVID-19 patients
Dyspnea and fatigue are the characteristics of COVID-19. Especially respiratory distress dyspnea, which is defined by a saturation of peripheral oxygen (SPO2) <93%, and a respiratory rate >30 times per min. Using the multivariable logistic regression method calculated in cohort C, which recorded some clinically detailed manifestations, we found that ARB users compared to no antihypertensive drug users were associated with reduced dyspnea (adjusted OR = 0.4, 95% CI: 0.236–0.678, P = 0.001) (Table 3) and less fatigue (adjusted OR = 0.643, 95% CI: 0.457–0.906, P = 0.012) (Table 4). Similar results were also observed in elderly COVID-19 patients (Tables 3 and 4). BB and CCB users were also associated with significantly reduced dyspnea, in COVID-19 patients (Table 3). These data suggest that ARB might improve respiratory syndromes in COVID-19 patients.
ARB associated with the improved clinical indices of infection, inflammation, and thrombus in elderly COVID-19 patients
Using the Mann–Whitney U test, we discovered that clinical indices related to infection and inflammation, including CRP, lymphocyte count, and procalcitonin, were significantly improved to normal levels in elderly COVID-19 patients who took ARB prior to hospitalization compared to non-antihypertensive drug users (Fig. 2a and Supplementary Table S9). Blood clots have been reported in COVID-19 patients30,31. D dimer, a biomarker of blood clots, was significantly reduced in elderly ARB users compared to non-antihypertensive drug users (Fig. 2a). The level of hemoglobin, which carries oxygen from the lungs to the rest of the body, was also significantly increased, returning to normal levels in elderly ARB users (Fig. 2a). COVID-19 elderly patients who took Thiazide, BB, or CCB prior to hospitalization were also associated with these improved clinical indices, except for the blood-clot biomarker (Fig. 2b–d). Taken together, these data indicate that COVID-19 elderly patients with hypertensive comorbidity who took ARB prior to hospitalizations might have reduced clinical syndromes compared to those who took no antihypertensive drugs.
Discussion
In this retrospective study, we found an association between the use of ARBs and reduced mortality rate in COVID-19 patients with comorbid hypertension (vs those taking no antihypertensives) (Table 1). We also noticed the decreased disease severity in elderly COVID-19 patients taking CCB and ACEI antihypertensive drugs (Table 2).
There are 18 reports studying the association of ARBs and ACEI drugs with COVID-1926,29,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47. Eleven out of the 18 papers reported the analysis of fatal outcome. The results are somewhat controversial due to the different methodologies used and the nature of cohorts. Eight of the eleven papers did not separate ARB and ACEI users, and combined them as one study group. Although both ARBs and ACEI are blockers of RAAS, they target different genes. A more rigorous analysis would be to calculate the COVID-19 association of ARBs and ACEI separately. The other three articles included separated ARBs users’ group32,42,47. One of the three reports published in Hypertension demonstrating similar conclusion as our report here. However, this study reported in a short communication with only 1 figure without detailed methodology47. Two reports published in JAMA and JAMA Cardiology and one retracted NEJM paper show that ARBs were not statistically significantly associated with fatal outcome of COVID-1932,42,48. One of the major differences is that their control group was quite different from our controls. The JAMA article used CCB users as control group42. The other articles (published in JAMA Cardiology and the retracted NEJM article) used all hypertension patients excluding the examined drug users (ARBs nonusers) as their control group32,48. Notably, their control group of ARB users included ACEI users. ACEI, as RAAS system drugs, may have similar effects to ARBs. We used their method (i.e., all hypertensive patients excluding ARBs, and including ACEIs in the control group) on our data: the adjusted results showed that ARBs were not statistically significantly associated with fatal outcome of COVID-19. However, ARB drugs statistically significantly improved fatal outcomes of COVID-19 patients when ACEI drug users were removed from the control group (Supplementary Table S10). Thus, this might partially contribute to the different conclusion of this paper that ARBs/ACEI drugs did not statistically significantly reduce the fatal outcomes of COVID-19 patients.
In our study, ARBs and ACEI exhibited different effects associated with the mortality and morbidity of COVID-19 patients, albeit both are RAAS blockers. Previous literature reported that ARBs could effectively block AT1R, whose stimulation is involved in multiorgan injuries28,49,50, suggesting that ARBs might be more effective in treating MODS. Besides antihypertensive effects, ARBs could directly reduce lung edema, epithelial and endothelial cell injury, and pro-inflammatory cytokines and chemokines, decrease apoptosis and fibrosis, protect mitochondrial functions, maintain insulin and lipid metabolism, and normalize the coagulation cascade16,51,52. These reports may provide mechanisms that ARBs were associated with significantly improved clinical characteristics of COVID-19 patients in this study. Our unpublished data demonstrated that ARBs, especially losartan, enhanced the survival rate more than ACEI in an avian influenza A H5N1 mouse model16. Further studies are necessary to elucidate the mechanisms involved in both ACEI and ARBs.
Although a wide variety of conditions, including SARS-CoV, sepsis, acid aspiration, bacteremia, and avian influenza (H5N1 and H7N9) infections, predispose patients to ARDS, a common mechanism seems to be an imbalance of RAAS9,11,12,13,23. Our previous studies in mice suggested that ACE, angiotensin II, and the type 1a angiotensin II receptor participate in disease pathogenesis, whereas ACE2 and the type 2a angiotensin II receptor could protect the mice from severe acute lung injury9,12. Blood levels of angiotensin II have been reported to be elevated in patients with COVID-19 (https://www.who.int/news-room/detail/30-01-2020-statement-on-the-second-meeting-of-the-international-health-regulations-(2005)-emergency-committee-regarding-the-outbreak-of-novel-coronavirus-(2019-ncov)) and influenza9,11. Interventions that restore the balance of RAAS, for example, ARB antihypertensives, thus could be beneficial. A trial of losartan, a member of ARBs, as treatment for COVID-19 is currently ongoing at the University of Minnesota (NCT043111777 and NCT04312009) (https://clinicaltrials.gov/ct2/show/NCT04311177?cond=COVID-19&lead=University+of+Minnesota&cntry=US&draw=2&rank=2; https://clinicaltrials.gov/ct2/show/NCT04312009?cond=COVID-19&lead=University+of+Minnesota&cntry=US&draw=2&rank=1).
We noted the limitations of this study. The patients’ numbers who took ACEI and thiazide were too small and may induce statistical bias. The outcomes of hypertensive and nonhypertensive COVID-19 patients were not compared. However, the uniqueness of our study is to statistically adjust all combined factors of age, gender, baseline of blood pressure (including SBP and DBP), and coexisting medical conditions (including chronic heart, lung, renal, liver, and cerebrovascular disease, diabetes, and cancer), although BB has no statistical significance before the adjustment.
In summary, the results from this statistical human study link RAAS blockers with COVID-19 patients, and indicate that the use of ARBs in hypertensive patients is associated with decreased mortality of COVID-19 patients. Therefore, hypertensive patients should continue to take ARBs and ACEIs in the current COVID-19 pandemic. Our study also indicates that antihypertensive drugs ARB, ACEI, CCB, and BB might also be potentially economic and effective remedies for COVID-19 patients, especially elderly patients, calling for clinical trials to test this directly.
Materials and methods
Study design and participants
In this retrospective study, we identified all the adult patients (≥18 years of age) with laboratory-confirmed COVID-19 pneumonia in the Renmin Hospital of Wuhan University (Wuhan, China) from January 12 to February 9, 2020, the Fifth Medical Center of Chinese PLA General Hospital (Beijing, China) from December 27, 2019 to March 4, 2020, and the Leishenshan Hospital (Wuhan, China) from February 8 to April 14, 2020.
The diagnosis was based on the New Coronavirus Pneumonia Prevention and Control Program published by the National Health Commission of China (2020, http://www.nhc.gov.cn/yzygj/s7653p/202003/46c9294a7dfe4cef80dc7f5912eb1989/files/ce3e6945832a438eaae415350a8ce964.pdf) and WHO interim guidance53. Only patients with comorbid hypertension, as diagnosed using the criteria of National Guidelines for Hypertension Management in China54 and 2018 ESC/ESH Guidelines for management of arterial hypertension55, were included in the final analysis. This study was approved by the Ethics Committees at the Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences (002-2020), and Zhongnan Hospital Ethics Committee (2020067). Verbal informed consent was obtained from patients or their family members if available, and the requirement for written informed consent was waived by the Ethics Committees.
Data collection
Demographical, epidemiological, clinical, disease severity, and outcome data were extracted from medical records by two trained physicians according to the unified data collection criteria. The classes of antihypertensive medication include ARB, ACE inhibitors, thiazide diuretics, beta-blockers, and calcium-channel blockers, before admission was summarized. Patients diagnosed with hypertension but not taking any antihypertensive drugs were also collected and compared as a control group. Routine blood tests of critically ill patients contained complete blood cell count, serum biochemical examinations (including renal and liver function), coagulation profile, D dimer, interleukin-6 (IL-6), and C-reactive protein (CRP). Disease severity was classified as severe or mild according to the guidelines of 2019-nCoV infection from the National Health Commission of the People’s Republic of China (http://www.nhc.gov.cn/yzygj/s7653p/202003/46c9294a7dfe4cef80dc7f5912eb1989/files/ce3e6945832a438eaae415350a8ce964.pdf). All data were independently checked by more than one physician.
Definitions
The date of onset was defined as the day when the symptom was noticed. The status at admission and worst status from onset to the final clinical endpoint (discharge/death) of COVID-19 are based on the Chinese official management guidelines for COVID-19 (http://www.nhc.gov.cn/yzygj/s7653p/202003/46c9294a7dfe4cef80dc7f5912eb1989/files/ce3e6945832a438eaae415350a8ce964.pdf): severe COVID-19 comprised any one of the following: at resting condition, the respiratory rate was more than 30 times per minute, blood oxygen was less than or equal to 93%, and an obvious progression of the pulmonary infiltrative lesion as shown by chest radiography was more than 50% within 24–48 h. Hypertension is defined as office SBP values >140 mmHg and/or diastolic BP (DBP) values >90 mmHg according to the 2018 ESC/ESH Guidelines for management of arterial hypertension55. Fever was defined as the axillary temperature of at least 37.3 °C.
Statistical analysis
The Mann–Whitney U test was used to compare differences in continuous variables between two groups of COVID-19 cases. The chi-squared test was used to compare differences in categorical variables between two groups of COVID-19 cases. Odds ratio (OR) and 95% confidence interval (CI) were calculated for risk evaluation. Adjusted OR was calculated using “Enter” stepwise multivariable logistic regression. Statistical analyses were performed with SPSS 16.0 for Windows (SPSS, Inc.).
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Acknowledgements
The authors would like to thank Prof. Linzhao Cheng of Johns Hopkins University and USTC for the fruitful discussions and editing of this paper. The authors would also like to thank Dr. Yingxia Liu, Lei Liu, and Hong Gao for providing clinical data of patients from ShenZhen Third people’s hospital when this project started. These data were used in another project. This work was supported by the National Natural Science Foundation of China (81788101), the Chinese Academy of Medical Sciences Innovation Fund for Medical Sciences (2017-12M-1-009), and the National Key Research and Development Plan of China (2020YFC0845500).
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Dr. Jiang conceived the study concept and design. F.Y., J.X., L.Y., J.L., M.G., Z.L., J.W., T.X., P.Y., and S.Z. collected clinical data with L. Cai’ s supervision. F.H. led clinical data statistical analysis with Y.Q. assistants. K.F.X., F.W., and G.F.G. provided critical help and discussion. C.J., F.Y., F.H., and Y.Q. wrote the paper. This paper was approved by all the authors.
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Yan, F., Huang, F., Xu, J. et al. Antihypertensive drugs are associated with reduced fatal outcomes and improved clinical characteristics in elderly COVID-19 patients. Cell Discov 6, 77 (2020). https://doi.org/10.1038/s41421-020-00221-6
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DOI: https://doi.org/10.1038/s41421-020-00221-6
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Renin–Angiotensin–Aldosterone Inhibitors and COVID-19 Infection
Current Hypertension Reports (2022)
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European Geriatric Medicine (2021)
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Association of clinical characteristics, antidiabetic and cardiovascular agents with diabetes mellitus and COVID-19: a 7-month follow-up cohort study
Journal of Diabetes & Metabolic Disorders (2021)