Analysis of Prior Aspirin Treatment on in-Hospital Outcome of Geriatric COVID-19 Infected Patients
Khaoula Zekri-Nechar, José Barberán, José J Zamorano-León, María Durbán, Alcira Andrés-Castillo, Carlos Navarro-Cuellar, Antonio López-Farré, Ana López-De-Andrés, Rodrigo Jiménez-García, Carlos H Martínez-Martínez
Medicina, doi:10.3390/medicina58111649
Background and Objectives: Aspirin (ASA) is a commonly used antithrombotic drug that has been demonstrated to reduce venous thromboembolism. The aim was to analyze if geriatric COVID-19 patients undergoing a 100 mg/day Aspirin (ASA) treatment prior to hospitalization differ in hospital outcome compared to patients without previous ASA therapy. Materials and Methods: An observational retrospective study was carried out using an anonymized database including geriatric COVID-19 patients (March to April 2020) admitted to Madrid Hospitals Group. A group of COVID-19 patients were treated with low ASA (100 mg/day) prior to COVID-19 infection. Results: Geriatric ASA-treated patients were older (mean age over 70 years; n = 41), had higher frequency of hypertension and hyperlipidemia, and upon admission had higher D-dimer levels than non-ASAtreated patients (mean age over 73 years; n = 160). However, patients under ASA treatment did not show more frequent pulmonary thromboembolism (PE) than non-ASA-treated patients. ASA-treated geriatric COVID-19-infected patients in-hospital < 30 days all-cause mortality was more frequent than in non-ASA-treated COVID-19 patients. In ASA-treated COVID-19-infected geriatric patients, anticoagulant therapy with low molecular weight heparin (LMWH) significantly reduced need of ICU care, but tended to increase in-hospital < 30 days all-cause mortality. Conclusions: Prior treatment with a low dose of ASA in COVID-19-infected geriatric patients increased frequency of in-hospital < 30 days all-cause mortality, although it seemed to not increase PE frequency despite D-dimer levels upon admission being higher than in non-ASA users. In ASA-treated geriatric COVID-19-infected patients, addition of LMWH therapy reduced frequency of ICU care, but tended to increase in-hospital < 30 days all-cause mortality.
Data Availability Statement: This study was carried out using an anonymized database provided by Madrid Hospitals Group. Data are from COVID-19-infected patients admitted in their hospital net that they made kindly available to some Spanish researchers within the program: COVID-19 data saves lives in Spain.
Conflicts of Interest: The authors declare that they have no conflict of interest.
References
Alamdari, Afaghi, Rahimi, Tarki, Tavana et al., Mortality Risk Factors among Hospitalized COVID-19 Patients in a Major Referral Center in Iran, Tohoku J. Exp. Med,
doi:10.1620/tjem.252.73
Becattini, Agnelli, Schenone, Eichinger, Bucherini et al., Aspirin for preventing the recurrence of venous thromboembolism, N. Engl. J. Med,
doi:10.1056/NEJMoa1114238
Berenguer, Ryan, Rodríguez-Baño, Jarrín, Carratalà et al., for the COVID-19@Spain Study. Characteristics and predictors of death among 4035 consecutively hospitalized patients with COVID-19 in Spain, Clin. Microbiol. Infect,
doi:10.1016/j.cmi.2020.07.024
Brighton, Eikelboom, Mann, Mister, Gallus et al., Low-dose aspirin for preventing recurrent venous thromboembolism, N. Engl. J. Med,
doi:10.1056/NEJMoa1210384
Canoglu, Saylan, Therapeutic dosing of low-molecular-weight heparin may decrease mortality in patients with severe COVID-19 infection, Ann. Saudi Med,
doi:10.5144/0256-4947.2020.462
Chen, Zhou, Dong, Qu, Gong et al., Epidemiological and clinical characteristics of 99 cases of 2019 novel coronavirus pneumonia in Wuhan, China: A descriptive study, Lancet,
doi:10.1016/S0140-6736(20)30211-7
Choi, Kim, Kang, The Potential Role of Dyslipidemia in COVID-19 Severity: An Umbrella Review of Systematic Reviews, J. Lipid Atheroscler,
doi:10.12997/jla.2020.9.3.435
Clausen, Sandoval, Spliid, Pihl, Perrett et al., SARS-CoV-2 Infection Depends on Cellular Heparan Sulfate and ACE2, Cell,
doi:10.1016/j.cell.2020.09.033
Eikelboom, Hirsh, Weitz, Johnston, Yi et al., Aspirin-resistant thromboxane biosynthesis and the risk of myocardial infarction, stroke, or cardiovascular death in patients at high risk for cardiovascular events, Circulation,
doi:10.1161/01.CIR.0000013777.21160.07
Glatthaar-Saalmüller, Mair, Saalmüller, Antiviral activity of aspirin against RNA viruses of the respiratory tract-an in vitro study, Influenza Other Respir. Viruses,
doi:10.1111/irv.12421
Goligher, Bradbury, Mcverry, Lawler, Berger et al., Therapeutic Anticoagulation with Heparin in Critically Ill Patients with COVID-19, N. Engl. J. Med
Gratz, Wiegele, Maleczek, Herkner, Schöchl et al., Risk of Clinically Relevant Venous Thromboembolism in Critically Ill Patients With COVID-19: A Systematic Review and Meta-Analysis, Front. Med,
doi:10.3389/fmed.2021.647917
Lawler, Goligher, Berger, Neal, Mcverry et al., Therapeutic Anticoagulation with Heparin in Noncritically Ill Patients with COVID-19, N. Engl. J. Med
Leentjens, Van Haaps, Wessels, Schutgens, Middeldorp, COVID-19-associated coagulopathy and antithrombotic agents-lessons after 1 year, Lancet Haematol,
doi:10.1016/S2352-3026(21)00105-8
Malas, Naazie, Elsayed, Mathlouthi, Marmor et al., Thromboembolism risk of COVID-19 is high and associated with a higher risk of mortality: A systematic review and meta-analysis, EClinicalMedicine,
doi:10.1016/j.eclinm.2020.100639
Martha, Pranata, Lim, Wibowo, Akbar, Active prescription of low-dose aspirin during or prior to hospitalization and mortality in COVID-19: A systematic review and meta-analysis of adjusted effect estimates, Int. J. Infect. Dis,
doi:10.1016/j.ijid.2021.05.016
Nikolich-Zugich, Knox, Rios, Natt, Bhattacharya et al., SARS-CoV-2 and COVID-19 in older adults: What we may expect regarding pathogenesis, immune responses, and outcomes, Geroscience,
doi:10.1007/s11357-020-00186-0
O'brien, Duncan, Kirsh, Allen, King et al., Prevention of pulmonary embolism and deep vein thrombosis with low dose aspirin: Pulmonary Embolism Prevention (PEP) trial, Lancet
Pavoni, Gianesello, Pazzi, Stera, Meconi et al., Venous thromboembolism and bleeding in critically ill COVID-19 patients treated with higher than standard low molecular weight heparin doses and aspirin: A call to action, Thromb. Res,
doi:10.1016/j.thromres.2020.09.013
Pranata, Huang, Lim, Wahjoepramono, July, Impact of cerebrovascular and cardiovascular diseases on mortality and severity of COVID-19-systematic review, meta-analysis, and meta-regression, J. Stroke Cerebrovasc. Dis,
doi:10.1016/j.jstrokecerebrovasdis.2020.104949
Qin, Dong, Zhang, Hu, Chen et al., Low molecular weight heparin and 28-day mortality among patients with coronavirus disease 2019: A cohort study in the early epidemic era, Thromb. Res,
doi:10.1016/j.thromres.2020.11.020
Richardson, Hirsch, Narasimhan, Crawford, Mcginn et al., the Northwell COVID-19 Research Consortium. Presenting Characteristics, Comorbidities, and Outcomes Among 5700 Patients Hospitalized with COVID-19 in the New York City Area, JAMA,
doi:10.1001/jama.2020.6775
Signes-Costa, Núñez-Gil, Soriano, Arroyo-Espliguero, Eid et al., Prevalence and 30-Day Mortality in Hospitalized Patients with COVID-19 and Prior Lung Diseases, Arch. Bronconeumol,
doi:10.1016/j.arbres.2020.11.012
Simes, Becattini, Agnelli, Eikelboom, Kirby et al., INSPIRE Study Investigators (International Collaboration of Aspirin Trials for Recurrent Venous Thromboembolism). Aspirin for the prevention of recurrent venous thromboembolism: The INSPIRE collaboration, Circulation,
doi:10.1161/CIRCULATIONAHA.114.008828
Speir, Yu, Ferrans, Huang, Epstein, Aspirin attenuates cytomegalovirus infectivity and gene expression mediated by cyclooxygenase-2 in coronary artery smooth muscle cells, Circ. Res,
doi:10.1161/01.RES.83.2.210
Tang, Bai, Chen, Gong, Li et al., Anticoagulant treatment is associated with decreased mortality in severe coronavirus disease 2019 patients with coagulopathy, J. Thromb. Haemost,
doi:10.1111/jth.14817
Thachil, Tang, Gando, Falanga, Cattaneo et al., ISTH interim guidance on recognition and management of coagulopathy in COVID-19, J. Thromb. Haemost,
doi:10.1111/jth.14810
Walz-Cicconi, Weller, Dose-related effect of acetylsalicylic acid on replication of varicella zoster virus in vitro, Proc. Natl. Acad. Sci,
doi:10.1073/pnas.81.16.5223
Wijaya, Andhika, Huang, Purwiga, Budiman, The effects of aspirin on the outcome of COVID-19: A systematic review and meta-analysis, Clin. Epidemiol. Glob. Health,
doi:10.1016/j.cegh.2021.100883
Yuan, Chen, Li, Chen, Wang et al., Mortality and pre-hospitalization use of low-dose aspirin in COVID-19 patients with coronary artery disease, J. Cell. Mol. Med,
doi:10.1111/jcmm.16198
DOI record:
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"abstract": "<jats:p>Background and Objectives: Aspirin (ASA) is a commonly used antithrombotic drug that has been demonstrated to reduce venous thromboembolism. The aim was to analyze if geriatric COVID-19 patients undergoing a 100 mg/day Aspirin (ASA) treatment prior to hospitalization differ in hospital outcome compared to patients without previous ASA therapy. Materials and Methods: An observational retrospective study was carried out using an anonymized database including geriatric COVID-19 patients (March to April 2020) admitted to Madrid Hospitals Group. A group of COVID-19 patients were treated with low ASA (100 mg/day) prior to COVID-19 infection. Results: Geriatric ASA-treated patients were older (mean age over 70 years; n = 41), had higher frequency of hypertension and hyperlipidemia, and upon admission had higher D-dimer levels than non-ASA-treated patients (mean age over 73 years; n = 160). However, patients under ASA treatment did not show more frequent pulmonary thromboembolism (PE) than non-ASA-treated patients. ASA-treated geriatric COVID-19-infected patients in-hospital < 30 days all-cause mortality was more frequent than in non-ASA-treated COVID-19 patients. In ASA-treated COVID-19-infected geriatric patients, anticoagulant therapy with low molecular weight heparin (LMWH) significantly reduced need of ICU care, but tended to increase in-hospital < 30 days all-cause mortality. Conclusions: Prior treatment with a low dose of ASA in COVID-19-infected geriatric patients increased frequency of in-hospital < 30 days all-cause mortality, although it seemed to not increase PE frequency despite D-dimer levels upon admission being higher than in non-ASA users. In ASA-treated geriatric COVID-19-infected patients, addition of LMWH therapy reduced frequency of ICU care, but tended to increase in-hospital < 30 days all-cause mortality.</jats:p>",
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"journal-title": "JAMA",
"key": "ref_3",
"volume": "323",
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},
{
"DOI": "10.1007/s11357-020-00186-0",
"article-title": "SARS-CoV-2 and COVID-19 in older adults: What we may expect regarding pathogenesis, immune responses, and outcomes",
"doi-asserted-by": "crossref",
"first-page": "505",
"journal-title": "Geroscience",
"key": "ref_4",
"volume": "42",
"year": "2020"
},
{
"DOI": "10.1161/CIRCULATIONAHA.120.047659",
"article-title": "Obesity Is a Risk Factor for Severe COVID-19 Infection: Multiple Potential Mechanisms",
"doi-asserted-by": "crossref",
"first-page": "4",
"journal-title": "Circulation",
"key": "ref_5",
"volume": "142",
"year": "2020"
},
{
"DOI": "10.1016/S0140-6736(00)02110-3",
"article-title": "Prevention of pulmonary embolism and deep vein thrombosis with low dose aspirin: Pulmonary Embolism Prevention (PEP) trial",
"doi-asserted-by": "crossref",
"first-page": "1295",
"journal-title": "Lancet",
"key": "ref_6",
"volume": "355",
"year": "2000"
},
{
"DOI": "10.1056/NEJMoa1114238",
"article-title": "WARFASA Investigators. Aspirin for preventing the recurrence of venous thromboembolism",
"doi-asserted-by": "crossref",
"first-page": "1959",
"journal-title": "N. Engl. J. Med.",
"key": "ref_7",
"volume": "366",
"year": "2012"
},
{
"DOI": "10.1056/NEJMoa1210384",
"article-title": "Low-dose aspirin for preventing recurrent venous thromboembolism",
"doi-asserted-by": "crossref",
"first-page": "1979",
"journal-title": "N. Engl. J. Med.",
"key": "ref_8",
"volume": "367",
"year": "2012"
},
{
"DOI": "10.1016/j.jstrokecerebrovasdis.2020.104949",
"article-title": "Impact of cerebrovascular and cardiovascular diseases on mortality and severity of COVID-19-systematic review, meta-analysis, and meta-regression",
"doi-asserted-by": "crossref",
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"key": "ref_9",
"volume": "29",
"year": "2020"
},
{
"DOI": "10.1016/j.thromres.2020.09.013",
"article-title": "Venous thromboembolism and bleeding in critically ill COVID-19 patients treated with higher than standard low molecular weight heparin doses and aspirin: A call to action",
"doi-asserted-by": "crossref",
"first-page": "313",
"journal-title": "Thromb. Res.",
"key": "ref_10",
"volume": "196",
"year": "2020"
},
{
"DOI": "10.1620/tjem.252.73",
"article-title": "Mortality Risk Factors among Hospitalized COVID-19 Patients in a Major Referral Center in Iran",
"doi-asserted-by": "crossref",
"first-page": "73",
"journal-title": "Tohoku J. Exp. Med.",
"key": "ref_11",
"volume": "252",
"year": "2020"
},
{
"DOI": "10.1111/jth.14810",
"article-title": "ISTH interim guidance on recognition and management of coagulopathy in COVID-19",
"doi-asserted-by": "crossref",
"first-page": "1023",
"journal-title": "J. Thromb. Haemost.",
"key": "ref_12",
"volume": "18",
"year": "2020"
},
{
"DOI": "10.1016/j.arbres.2020.11.012",
"article-title": "Prevalence and 30-Day Mortality in Hospitalized Patients with COVID-19 and Prior Lung Diseases",
"doi-asserted-by": "crossref",
"first-page": "13",
"journal-title": "Arch. Bronconeumol.",
"key": "ref_13",
"volume": "57",
"year": "2021"
},
{
"key": "ref_14",
"unstructured": "World Health Organization (2022, July 10). Coronavirus Disease (COVID-19) Outbreak. Regional Office for Europe. Available online: https://www.euro.who.int/en/health-topics/health-emergencies/coronavirus-covid-19/statements/statement-older-people-are-at-highest-risk-from-covid-19,-but-all-must-act-to-prevent-community-spread."
},
{
"DOI": "10.1016/j.cmi.2020.07.024",
"article-title": "Characteristics and predictors of death among 4035 consecutively hospitalized patients with COVID-19 in Spain",
"doi-asserted-by": "crossref",
"first-page": "1525",
"journal-title": "Clin. Microbiol. Infect.",
"key": "ref_15",
"volume": "26",
"year": "2020"
},
{
"article-title": "Platelets and infection—An emerging role of platelets in viral infection",
"first-page": "649",
"journal-title": "Front. Immunol.",
"key": "ref_16",
"volume": "5",
"year": "2014"
},
{
"article-title": "Antiviral activity of aspirin against RNA viruses of the respiratory tract-an in vitro study",
"first-page": "85",
"journal-title": "Influenza Other Respir. Viruses",
"key": "ref_17",
"volume": "11",
"year": "2016"
},
{
"DOI": "10.1073/pnas.81.16.5223",
"article-title": "Dose-related effect of acetylsalicylic acid on replication of varicella zoster virus in vitro",
"doi-asserted-by": "crossref",
"first-page": "5223",
"journal-title": "Proc. Natl. Acad. Sci. USA",
"key": "ref_18",
"volume": "81",
"year": "1984"
},
{
"DOI": "10.1161/01.RES.83.2.210",
"article-title": "Aspirin attenuates cytomegalovirus infectivity and gene expression mediated by cyclooxygenase-2 in coronary artery smooth muscle cells",
"doi-asserted-by": "crossref",
"first-page": "210",
"journal-title": "Circ. Res.",
"key": "ref_19",
"volume": "83",
"year": "1998"
},
{
"DOI": "10.1016/j.ijid.2021.05.016",
"article-title": "Active prescription of low-dose aspirin during or prior to hospitalization and mortality in COVID-19: A systematic review and meta-analysis of adjusted effect estimates",
"doi-asserted-by": "crossref",
"first-page": "6",
"journal-title": "Int. J. Infect. Dis.",
"key": "ref_20",
"volume": "108",
"year": "2021"
},
{
"DOI": "10.1016/j.cegh.2021.100883",
"article-title": "The effects of aspirin on the outcome of COVID-19: A systematic review and meta-analysis",
"doi-asserted-by": "crossref",
"first-page": "100883",
"journal-title": "Clin. Epidemiol. Glob. Health",
"key": "ref_21",
"volume": "12",
"year": "2021"
},
{
"DOI": "10.1177/1470320320927851",
"doi-asserted-by": "crossref",
"key": "ref_22",
"unstructured": "Kulkarni, S., Jenner, B.L., and Wilkinson, I. (2020). COVID-19 and hypertension. J. Renin. Angiotensin Aldosterone Syst., 21."
},
{
"DOI": "10.12997/jla.2020.9.3.435",
"article-title": "The Potential Role of Dyslipidemia in COVID-19 Severity: An Umbrella Review of Systematic Reviews",
"doi-asserted-by": "crossref",
"first-page": "435",
"journal-title": "J. Lipid Atheroscler.",
"key": "ref_23",
"volume": "9",
"year": "2020"
},
{
"DOI": "10.1111/jcmm.16198",
"article-title": "Mortality and pre-hospitalization use of low-dose aspirin in COVID-19 patients with coronary artery disease",
"doi-asserted-by": "crossref",
"first-page": "1263",
"journal-title": "J. Cell. Mol. Med.",
"key": "ref_24",
"volume": "25",
"year": "2021"
},
{
"article-title": "Thromboembolism risk of COVID-19 is high and associated with a higher risk of mortality: A systematic review and meta-analysis",
"first-page": "100639",
"journal-title": "EClinicalMedicine",
"key": "ref_25",
"volume": "29",
"year": "2020"
},
{
"DOI": "10.1161/CIRCULATIONAHA.114.008828",
"article-title": "INSPIRE Study Investigators (International Collaboration of Aspirin Trials for Recurrent Venous Thromboembolism). Aspirin for the prevention of recurrent venous thromboembolism: The INSPIRE collaboration",
"doi-asserted-by": "crossref",
"first-page": "1062",
"journal-title": "Circulation",
"key": "ref_26",
"volume": "130",
"year": "2014"
},
{
"DOI": "10.1016/j.cell.2020.09.033",
"article-title": "SARS-CoV-2 Infection Depends on Cellular Heparan Sulfate and ACE2",
"doi-asserted-by": "crossref",
"first-page": "1043",
"journal-title": "Cell",
"key": "ref_27",
"volume": "183",
"year": "2020"
},
{
"article-title": "Low molecular weight heparin and 28-day mortality among patients with coronavirus disease 2019: A cohort study in the early epidemic era",
"first-page": "19",
"journal-title": "Thromb. Res.",
"key": "ref_28",
"volume": "198",
"year": "2020"
},
{
"DOI": "10.1111/jth.14817",
"article-title": "Anticoagulant treatment is associated with decreased mortality in severe coronavirus disease 2019 patients with coagulopathy",
"doi-asserted-by": "crossref",
"first-page": "1094",
"journal-title": "J. Thromb. Haemost.",
"key": "ref_29",
"volume": "18",
"year": "2020"
},
{
"DOI": "10.1016/S2352-3026(21)00105-8",
"article-title": "COVID-19-associated coagulopathy and antithrombotic agents-lessons after 1 year",
"doi-asserted-by": "crossref",
"first-page": "e524",
"journal-title": "Lancet Haematol.",
"key": "ref_30",
"volume": "8",
"year": "2021"
},
{
"DOI": "10.5144/0256-4947.2020.462",
"article-title": "Therapeutic dosing of low-molecular-weight heparin may decrease mortality in patients with severe COVID-19 infection",
"doi-asserted-by": "crossref",
"first-page": "462",
"journal-title": "Ann. Saudi Med.",
"key": "ref_31",
"volume": "40",
"year": "2020"
},
{
"DOI": "10.1056/NEJMoa2103417",
"article-title": "Therapeutic Anticoagulation with Heparin in Critically Ill Patients with COVID-19",
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