Thromboembolic complications in patients with acute surgical pathology with coronavirus infection of COVID-19

Background. Coronavirus disease (COVID-19) is a highly contagious infection, the etiological factor of which is the SARS-CoV2 virus. In COVID-19, hemostasis disorders vary widely: from latent hypercoagulation, which occurs only on the basis of laboratory tests, to severe clinical manifestations in the form of cerebral, coronary arterial or venous thrombosis complicated by pulmonary embolism. The purpose was to study of clinical manifestations of hemostasis disorders according to laboratory studies. Materials and methods. The observation data of 96 patients who were treated for surgical pathology and in whom COVID-19 was detected are presented. Patients were hospitalized in the intensive care unit, thrombotic complications were detected in 37 %. Both venous (64 %) and arterial (36 %) thrombosis occurred. Results. According to a survey of patients with a confirmed diagnosis of COVID-19, pulmonary embolism was detected in 11.4 %, deep vein thrombo-sis and catheter-associated thrombosis in 1.2 %, ischemic stroke in 1.3 % of patients. The cumulative frequency of thrombosis was 28 %. Attention should be paid to the complexity of the diagnosis of thrombotic complications in patients who underwent artificial lung ventilation. possible thrombotic complications, regardless of clinical manifestations. Conclusions. Preference should be given to low molecular weight heparins in a standard prophylactic dose, an alternative to which are direct oral anticoagulants used in surgical protocols to prevent postoperative thrombosis. The duration of post-hospital thromboprophylaxis is determined individually taking into account the risk factors of thrombosis until the normalization of D-dimer and fibrinogen, but not less than 2 weeks after discharge. © 2022. The Authors. This is an open access article under the terms of the Creative Commons Attribution 4.0 International License, CC BY, which allows others to freely distribute the published article, with the obligatory reference to the authors of original works and original publication in this journal.

Assessment of the course of coagulopathies in patients with surgical pathology on the background of COVID-19

Background. Coronavirus disease (COVID-19) is a highly contagious infection, the etiological factor of which is the SARS-CoV-2. In COVID-19, hemostasis disorders vary widely: from latent hypercoagulation, which is detected only by the results of laboratory tests, to severe clinical manifestations in the form of cerebral, coronary arterial or venous thrombosis complicated by pulmonary embolism. The purpose: to study clinical manifestations of hemostasis disorders according to laboratory studies. Materials and methods. The observation data of 89 patients who were treated for surgical pathology associated with COVID-19 are presented. All individuals were hospitalized in the intensive care unit, thrombotic complications were detected in 37 % of them. Both venous (64 %) and arterial (36 %) thrombosis occurred. Hemorrhagic complications were found in 15.7 % of patients. Results. According to a survey of people with a confirmed diagnosis of COVID-19, pulmonary embolism was detected in 11.4 %, deep vein thrombosis and catheter-associated thrombosis — in 1.2 %, ischemic stroke — in 1.3 % of patients. The cumulative frequency of thrombosis was 28 %. Attention should be paid to the comple xity of the diagnosis of thrombotic complications in patients who underwent artificial lung ventilation. The overall cumulative incidence of thrombosis on days 7, 14 and 21 of hospitalization was 12, 28 and 36 %, respectively, while the frequency of thrombotic complications with clinical manifestations was only 7, 14 and 21 %, which is almost 2 times less common. This once again suggests the need to examine all patients with COVID-19 for possible thrombotic complications, regardless of clinical manifestations. Conclusions. Patients should receive continuous thromboprophylaxis after discharge from a hospital. Preference should be given to low molecular weight heparins in a standard prophylactic dose, an alternative to which are direct oral anticoagulants used in surgical protocols to prevent postoperative thrombosis. The duration of post-hospital thromboprophylaxis is determined individually taking into account the risk factors of thrombosis until the normalization of D-dimer and fibrinogen, but not less than 2 weeks after discharge. © 2022. The Authors.

ACE2 and TMPRSS2 SNPs as Determinants of Susceptibility to, and Severity of, a COVID-19 Infection.

Background: Genetic risk factors may be related to the infectivity and severity of SARS-CoV-2 infection. Angiotensin-converting enzyme 2 (ACE2) and host transmembrane serine protease (TMPRSS2) have key role in viral cell entrance and priming. Methods: This case-control study on 147 healthy controls and 299 COVID-19 patients identified potential determinants and risk factors, including gene polymorphism involved in the severity (mild, moderate, severe) of COVID-19 disease defined by CORAD radiological criteria. Results: The ACE2 s2285666 and TMPRSS2 rs12329760 SNPs were significantly linked with COVID-19 disease severity, as were certain co-morbidities (hypertension, heart disease) and laboratory parameters. Both SNPs were amongst the highest predictors of disease severity: TMPRSS2 rs12329760 CT + TT [odds ratio (95% CI) 17.6 (5.1-61.10), ACE2 rs2285666 CT + TT 9.9 (3.2-30.9), both p < 0.001]. There was an increase in the expression of genotype frequencies of ACE2 rs2285666 and TMPRSS2 rs1232976 (TT), (CT + TT), and (T) allele in severe COVID-19 group compared to control and mild groups. Disease severity was also linked to elevated CRP, ferritin and D-dimer, and lower lymphocytes and platelet count (all p < 0.001). Conclusion: ACE2 rs2285666 and TMPRSS2 rs12329760 SNPs, in addition to lymphocyte count, CRP, D-dimers, ferritin, and hypertension, are predictors of COVID-19 disease severity.

Variance in management of extracorporeal membrane oxygenation-associated fibrin sheaths at a single institution.

Objective: Extracorporeal membrane oxygenation (ECMO) support for patients with cardiac or respiratory failure has been increasingly used by advanced critical care practitioners. The thromboembolic complications of ECMO have been extensively discussed and researched; however, research and discussion on the development, risks, and management of cannulae-associated fibrin sheaths are lacking. Methods: Institutional review board approval was not required. We have presented three cases detailing the identification and individualized management of ECMO-associated fibrin sheaths at our institution. The three patients provided written informed consent for the report of their case details and imaging studies. Results: Of our three patients with ECMO-associated fibrin sheaths, two were managed successfully with anticoagulation alone. One could not receive anticoagulation therapy and underwent inferior vena cava filter placement. Conclusions: Fibrin sheath formation around indwelling ECMO cannulae is an unresearched complication of ECMO cannulation. We would recommend an individualized approach to the management of these fibrin sheaths and have provided three examples of successful management.

Deep venous thrombosis in a kidney transplant recipient with COVID-19: a case report.

The outcomes of COVID-19 in kidney transplant recipients have shown high mortality. In addition to their immunocompromised states, kidney transplant recipients frequently have certain exacerbation risk comorbidities of COVID-19, such as diabetes mellitus, hypertension, and chronic kidney disease. Several concomitant diseases develop during the course of COVID-19, one of which is thromboembolism, which can potentially lead to a critical condition. However, thromboembolic complications in kidney transplant recipients with COVID-19 have not been fully addressed in previous studies. A 62-year-old man, who underwent kidney transplantation 17 years ago, was diagnosed with COVID-19 and was admitted to our hospital. Although the patient was in remission at the start of the hospitalization, his condition became severe on day 7 after admission, with fever, elevated white blood cell counts (10,000/µL) and a high C-reactive protein level (6.9 mg/dL). Although the patient was not under forced bed rest, an ultrasound study on day 10 detected deep venous thrombosis (DVT), with an elevated D-dimer level (6.2 µg/dL). We withdrew the mycophenolate mofetyl and the tacrolimus dosage but did not administer any specific treatment for COVID-19. The patient achieved successful clearance of SARS-CoV-2 on day 16. The DVT disappeared after systematic heparin treatment and oral rivaroxaban for 2 months. DVT occurred in a kidney transplant recipient with COVID-19 who was not bedridden and might manifest when the clinical status was exacerbated during hospitalization.

The Effectiveness of Compression Therapy in the Prevention of Venous Thromboembolic Complications in Patients With COVID-19

BACKGROUND The main method for preventing thrombotic complications in patients with coronavirus infection is anticoagulant therapy (ACT). However, its use is not always possible, in particular in patients with bleeding. The only method of prevention in this case is elastic compression (EC) of the lower extremities. AIM OF STUDY To evaluate the effectiveness of lower extremity EC for the prevention of venous thromboembolic complications (VTEC) in patients with a new coronavirus infection. MATERIAL AND METHODS The study was approved by the local Ethics Committee of the Ryazan State Medical University of the Ministry of Health of Russian Federation and registered on the ClinicalTrials.gov platform (identifier NCT05143567). The study included 69 patients without prophylactic compression (Group 1) and 65 patients who used prophylactic compression stockings (Group 2). The patients were treated in the covid hospital from July to November 2021. All patients had verified coronavirus infection, they took ACT and underwent ultrasound duplex scanning of the veins of the lower extremities upon admission, in the intensive care unit and upon discharge. We assessed the frequency of venous thromboembolic complications (VTEC), hemorrhagic complications, and mortality. To assess the severity of bleeding, the classification of the Committee of the International Society on Thrombosis and Haemostasis (ISTH) was used. RESULTS In patients without prophylactic compression (Group 1) there were 7 VTEC cases (10.14%);deep vein thrombosis (DVT) — 4 (5.8%), pulmonary embolism (PE) — 3 (4.3%). All 6 cases (8.7%) with PE were fatal. It was noted that 2 cases of PE (2.8%) were verified upon autopsy, and not clinically. In patients of the 2nd group with the use of elastic compression, the overall incidence of VTEC was only one case (1.6%). When analyzing the frequency of bleeding in the 1st group, there was one pulmonary bleeding (1.4%), in the 2nd group there was also one case of intense intermuscular hematoma (1.6%). Significant bleeding was observed in one patient (1.4%) of the 1st group, and in 3 (4.8%) cases of the 2nd group. The minor bleeding was observed in 11 patients (15.9%) of the 1st group, and in 8 (12.7%) patients of the 2nd group. The mortality during hospitalization was 11 (15.9%) cases in patients of the 1st group (without EC) and 7 (11.1%) in patients of the 2nd group (with EC) (p=0.419). CONCLUSIONS The mortality in patients with coronavirus infection without compression therapy is higher than in patients with compression stockings (p=0.419). Patients wearing compression stockings in the hospital had a low incidence of VTEC (1.6% of cases in group 2 versus 10.14% of cases in group 1, p=0.039). The study groups had the same frequency of bleeding (group 1 — one case (1.4%), group 2 — one case (1.6%). The use of preventive compression at the inpatient stage of treatment of a new coronavirus infection makes it possible to prevent VTEC in patients with bleeding when anticoagulant therapy is not possible. © 2022 Sklifosovsky Research Institute for Emergency Medicine. All rights reserved.

A Review of the Prevalence of Thromboembolic Complications among Pregnant Women Infected with COVID-19.

Background: Thrombotic conditions triggered by SARS-CoV-2 virus can result in high mortality, especially in pregnant women as they are already in a hypercoagulability state. This thereby leads to excessive inflammation that will increase the risk of thromboembolic (TE) complications. Objective: The aim of this study is to review the prevalence of thromboembolic complications such as deep venous thrombosis, pulmonary embolism, and intervillous thrombosis, and their preventive strategies among pregnant women infected with COVID-19. Method: The articles were retrieved from online databases PubMed and ScienceDirect published from February 2020 to April 2022. Findings: A total of 5249 participants including 5128 pregnant women and 121 placentas from 19 studies were identified for having TE complications after being infected with COVID-19. The types of TE complications that developed within pregnant women were disseminated intravascular coagulation (DIC) (n = 44, 0.86%), unmentioned thromboembolic complications (TE) (n = 14, 0.27%), intervillous thrombosis (IVT) (n = 9, 0.18%), pulmonary embolism (PE) (n = 6, 0.12%), COVID-19 associated coagulopathy (CAC) (n = 5, 0.10%), and deep venous thrombosis (DVT) (n = 2, 0.04%). Whereas the prevalence of TE complications reported from studies focusing on placenta were IVT (n = 27, 22.3%), subchorionic thrombus (SCT) (n = 9, 7.44%), and placental thrombosis (n = 5, 4.13%). Thromboprophylaxis agent used among pregnant women include low molecular weight heparin (LMWH) at prophylactic dose (n = 9). Conclusions: The prevalence of thromboembolic complications among pregnant women infected by COVID-19 is low with DIC being the most common form and placental thrombosis being the least common form of TE complications that occurred within pregnant women infected with COVID-19. Anticoagulation, in particular LMWH (variable dose), is frequently used to prevent TE complications.

Arterial Thrombotic Complications in COVID-19: A Case of Renal Infarction.

COVID-19 infection has been associated with thrombotic complications, especially venous thromboembolism. Although arterial thrombotic complications are rarely seen in these patients, we report the case of a 43-year-old patient who developed thrombosis of the main branch of the left renal artery, causing partial infarction of the left kidney associated with severe pain. He had no risk factors for thrombosis except for COVID-19 infection. We excluded any possible condition usually associated with renal artery thrombosis/embolism (i.e., cardiovascular, oncological, hematological, or rheumatic). The thrombosis resolved after a combination of anticoagulant and anti-platelet therapy. This case highlights the importance of the risk of recurrence of thrombosis in patients with a recent history of COVID-19, even after hospital discharge, improvement of the initial thrombotic event, and clearance of SARS-CoV-2 infection.

Changing physicians’ attitudes regarding anticoagulant therapy for novel coronavirus infection in 2021

Background. Despite a set of anti-epidemic measures, including mass vaccination, the spread of COVID-19-infection in the second half of 2021 continues. This is largely due to the emergence of new, more aggressive strains. One way or another, entry of SARS-CoV-2 virus into human body is still accompanied by development of COVID-19-associated coagulopathy realized in various thrombotic complications. Current clinical guidelines, already the 12th revision, describe the main approaches to treatment and prevention of venous thromboembolic complications, but their implementation is not always possible. Despite the increasing awareness of clinicians concerning pathogenetic aspects of infectious process development, a significant number of deviations and disorders, including those of systemic nature, still occur in real practice largely due to excessive desire to prevent some of them. Objectives: to study real clinical practice changes in treatment and prevention of thrombotic complications in patients with new COVID-19-infection. Materials/Methods. The work was based on two anonymous surveys conducted in February and August 2021 with the participation of 223 and 131 physicians treating patients with chronic and acute vascular diseases, respectively. The questionnaires included 17 questions describing physicians’ attitudes regarding treatment choices, use of pharmaceuticals, and methods of hemostasis monitoring. Results. The results of the questionnaires revealed a continuing high degree of awareness among the medical community about the increased risk of thrombotic complications in COVID-19 and the need to correct coagulopathy by prescribing adequate anticoagulant therapy (ACT). Low molecular weight heparins (LMWHs) retain the highest degree of confidence among respondents in inpatient ACT, although the number of physicians recommending new oral anticoagulants (NOACs) is increasing, despite the lack of high-quality randomized trials confirming their effectiveness. There has been an increase in respondents’ awareness of issues related to hemostasis laboratory control. Conclusions. The results obtained indicate the need to continue the information campaign regarding the prevention of COVID-19-coagulopathy among healthcare workers. © 2021, Hemostasis and Rheology LLC. All rights reserved.

Rare Thrombotic Complications of COVID-19: A Case Series.

Coronavirus disease 2019 (COVID-19) is known to manifest with bilateral pneumonia and acute respiratory distress syndrome. This infection with severe acute respiratory syndrome coronavirus 2 (SAR-CoV-2) is alarming because it not only affects the respiratory system but may also cause thromboembolic events. Multiple studies have reported procoagulation/hypercoagulable complications in COVID-19. This case series is a valuable addition to the literature because it reflects unique presentations of thrombotic events in COVID-19 patients. We report two cases in which patients presented with thromboembolic complications secondary to COVID-19 infection: one with severe bowel ischemia and the other with blue toe syndrome. To formulate management strategies to prevent fatal outcomes for patients with COVID-19, physicians must be vigilant in identifying life-threatening thromboembolic complications from this disease.

Anticoagulation Prior to COVID-19 Infection Has No Impact on 6 Months Mortality: A Propensity Score-Matched Cohort Study.

The coronavirus disease 2019 (COVID-19) shows high incidence of thromboembolic events in humans. In the present study, we aimed to evaluate if anticoagulation prior to COVID-19 infection may impact clinical profile, as well as mortality rate among patients hospitalized with COVID-19. The study was based on retrospective analysis of medical records of patients with laboratory confirmed SARS-CoV-2 infection. After propensity score matching (PSM), a group of 236 patients receiving any anticoagulant treatment prior to COVID-19 infection (AT group) was compared to 236 patients without previous anticoagulation (no AT group). In 180 days, the observation we noted comparable mortality rate in AT and no AT groups (38.5% vs. 41.1%, p = 0.51). Similarly, we did not observe any statistically significant differences in admission in the intensive care unit (14.1% vs. 9.6%, p = 0.20), intubation and mechanical ventilation (15.0% vs. 11.6%, p = 0.38), catecholamines usage (14.3% vs. 13.8%, p = 0.86), and bleeding rate (6.3% vs. 8.9%, p = 0.37) in both groups. Our results suggest that antithrombotic treatment prior to COVID-19 infection is unlikely to be protective for morbidity and mortality in patients hospitalized with COVID-19.

Clinical complications seen in patients after recovery from coronavirus disease 2019: Experience from a COVID care center.

We have had recent experience that patients who have recovered from coronavirus disease 2019 (COVID-19) infection are being readmitted with thromboembolic complications, and some have had sudden cardiac death. There is paucity of literature on such presentations after clinical and microbiological recovery. In the present case series, we present five such patients recently managed at our COVID-19 care facility. All the patients described were elderly (mean age: 66 years) with multiple comorbidities (mean Charlson Comorbidity Index score: 3.5). Two were initially managed at another COVID care facility and discharged. They were admitted at our center within one week of discharge. One patient who was managed at our center was discharged and then readmitted. The other two had recovered from their illness and were planned for discharge (mean duration of hospital stay in initial admission: 14.4 days). All presented within one week of clinical and microbiological recovery (mean: 4.2 days). All were on adequate anticoagulation during initial presentation. All these patients had raised D-dimer levels (three suffered sudden cardiac arrest, one had a confirmed pulmonary thromboembolism, and one had acute ST-elevation myocardial infarction). Thromboembolic complications should be considered an important differential diagnosis in all patients who present with any complication in the immediate follow-up period of recovery from COVID-19 disease. Repeat analysis of D-dimer levels at follow-up may be considered in those who recovered from severe disease. Extended period of anticoagulation and close follow-up may be considered in all patients with COVID-19 who are at high risk of developing thromboembolic complications.

Current opinion in neurological manifestations of SARS-CoV-2 infection.

Neurological symptoms occur in approximately one-third of hospitalized patients with coronavirus disease 2019 (COVID-19). Among these symptoms, hypoxic encephalopathy develops in one-fifth of severe cases, while ischemic strokes due to thrombotic complications are common in one-third of COVID-19 intensive care patients. Brain involvement of severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2) is eventuated by several routes, including hematogenous spread, transsynaptic entry through infected neurons, olfactory nerve, ocular epithelium, vascular endothelium, and impaired blood-brain barrier. Besides the high angiotensin-converting enzyme-2 (ACE2) binding affinity, and FURIN preactivation, SARS-CoV-2 maintains efficient neuronal entry while evading immune surveillance by using basigin and neuropilin-1 receptors. However, the neurological manifestations and their pathogenic mechanisms are still debated in COVID-19 patients.

COVID-19 Related Cerebrovascular Thromboembolic Complications in Three Young Patients.

Coronavirus disease 2019 (COVID-19) is a viral illness, caused by the novel severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2). It is currently affecting millions of people worldwide and is associated with coagulopathy, both in the venous and arterial systems. The proposed mechanism being excessive inflammation, platelet activation, endothelial dysfunction, and stasis. As an ongoing pandemic declared by WHO in March 2020, health systems worldwide are experiencing significant challenges with COVID-19-related complications. It has been noticed that patients with COVID-19 are at greater risk of thrombosis.

[COVID-19 infection-Risk of thromboembolic complications]. / COVID-19-Infektion ­ Risiko für thrombembolische Komplikationen.

While the COVID-19 syndrome triggered by the SARS CoV­2 was initially seen predominantly as a pulmonary disease, the number of reports of vascular complications has recently increased. The aim of the present review article is to summarize the most relevant vascular complications in COVID-19 patients. These include venous and arterial thromboembolic events as well as local thromboses, which can form directly on the endothelium at the site of cytokine release. A generalized coagulopathy also appears to promote this thrombogenic condition. With a rate of approximately 20%, deep vein thrombosis (DVT) of the leg is one of the most common thromboembolic events in COVID-19 patients requiring intensive care treatment. In addition, arterial events, such as stroke or acute coronary syndrome were also observed in COVID-19 patients with pre-existing vascular disease. Children rarely have vascular complications, but a systemic immune response similar to the Kawasaki syndrome and toxic shock syndrome has been reported. According to current data, the risk of thromboembolic events in hospitalized COVID-19 patients is significantly increased, making thrombosis prophylaxis with low molecular weight or unfractionated heparin necessary. If pharmaceutical thrombosis prophylaxis is contraindicated, intermittent pneumatic compression should be used. In addition, in patients admitted to the hospital with suspected or proven SARS-CoV­2 infection, the determination of D­dimers and, in the case of positive results, broad indication for compression sonography of the deep leg veins are recommended. This allows to detect and treat DVT at an early stage. The treatment of thromboses should be carried out according to current guidelines with therapeutic anticoagulation. Further studies and registries are needed to improve the understanding of the relationship between COVID-19 infection and the occurrence of thromboembolic events.

A critical review of the pathophysiology of thrombotic complications and clinical practice recommendations for thromboprophylaxis in pregnant patients with COVID-19.

Those who are infected with Severe Acute Respiratory Syndrome-related CoronaVirus-2 are theoretically at increased risk of venous thromboembolism during self-isolation if they have reduced mobility or are dehydrated. Should patients develop coronavirus disease (COVID-19) pneumonia requiring hospital admission for treatment of hypoxia, the risk for thromboembolic complications increases greatly. These thromboembolic events are the result of at least two distinct mechanisms - microvascular thrombosis in the pulmonary system (immunothrombosis) and hospital-associated venous thromboembolism. Since pregnancy is a prothrombotic state, there is concern regarding the potentially increased risk of thrombotic complications among pregnant women with COVID-19. To date, however, pregnant women do not appear to have a substantially increased risk of thrombotic complications related to COVID-19. Nevertheless, several organizations have vigilantly issued pregnancy-specific guidelines for thromboprophylaxis in COVID-19. Discrepancies between these guidelines reflect the altruistic wish to protect patients and lack of high-quality evidence available to inform clinical practice. Low molecular weight heparin (LMWH) is the drug of choice for thromboprophylaxis in pregnant women with COVID-19. However, its utility in non-pregnant patients is only established against venous thromboembolism, as LMWH may have little or no effect on immunothrombosis. Decisions about initiation and duration of prophylactic anticoagulation in the context of pregnancy and COVID-19 must take into consideration disease severity, outpatient vs inpatient status, temporal relation between disease occurrence and timing of childbirth, and the underlying prothrombotic risk conferred by additional comorbidities. There is currently no evidence to recommend the use of intermediate or therapeutic doses of LMWH in thromboprophylaxis, which may increase bleeding risk without reducing thrombotic risk in pregnant patients with COVID-19. Likewise, there is no evidence to comment on the role of low-dose aspirin in thromboprophylaxis or of anti-cytokine and antiviral agents in preventing immunothrombosis. These unanswered questions are being studied within the context of clinical trials.

Mortality and the Use of Antithrombotic Therapies Among Nursing Home Residents with COVID-19.

BACKGROUND/OBJECTIVES: Nursing home (NH) residents are a vulnerable population, susceptible to respiratory disease outbreaks such as coronavirus disease 2019 (COVID-19). Poor outcome in COVID-19 is at least partly attributed to hypercoagulability, resulting in a high incidence of thromboembolic complications. It is unknown whether commonly used antithrombotic therapies may protect the vulnerable NH population with COVID-19 against mortality. This study aimed to investigate whether the use of oral antithrombotic therapy (OAT) was associated with a lower mortality in NH residents with COVID-19. DESIGN: A retrospective case series. SETTING: Fourteen NH facilities from the NH organization Envida, Maastricht, the Netherlands PARTICIPANTS: A total of 101 NH residents with COVID-19 were enrolled. MEASUREMENTS: The primary outcome was all-cause mortality. The association between age, sex, comorbidity, OAT, and mortality was assessed using logistic regression analysis. RESULTS: Overall mortality was 47.5% in NH residents from 14 NH facilities. Age, comorbidity, and medication use were comparable among NH residents who survived and who died. OAT was associated with a lower mortality in NH residents with COVID-19 in the univariable analysis (odds ratio (OR) = 0.89; 95% confidence interval (CI) = 0.41-1.95). However, additional adjustments for sex, age, and comorbidity attenuated this difference. Mortality in males was higher compared with female residents (OR = 3.96; 95% CI = 1.62-9.65). Male residents who died were younger compared with female residents (82.2 (standard deviation (SD) = 6.3) vs 89.1 (SD = 6.8) years; P < .001). CONCLUSION: NH residents in the 14 facilities we studied were severely affected by the COVID-19 pandemic, with a mortality of 47.5%. Male NH residents with COVID-19 had worse outcomes than females. We did not find evidence for any protection against mortality by OAT, necessitating further research into strategies to mitigate poor outcome of COVID-19 in vulnerable NH populations. J Am Geriatr Soc 68:1647-1652, 2020.