Authors, year Country | Design | Number of patients | Incidence of PE | Remarks |
---|---|---|---|---|
Grillet et al. France [29] | Retrospective study SARS-CoV-2 according to + ve RT-PCR or high clinical suspicion | SARS-CoV-2 + ve: 2003 pts Hosp. adm..: 280 pts CTA performed: 100 pts | 23% (among patients with CTA) 8.9% (among hosp. admissions) 1.1% (among all COVID-19 + ve pts) | Radiologic study, no clinical correlates Average time to CTA: 12 days PE pts.: ICU admissions, 74%, MV: 65% No differences in comorbidities between PE and no PE Selection bias (only severe cases/clinical deterioration with CTA) |
Leonard-Lorant et al. France [30] | Retrospective study 2 French hospitals | SARS-CoV-2 + ve: 961 pts COVID-19 with CTA: 106 pts (97 + ve RT-PCR, 9 high clinical suspicion) | 30% (among patients with CTA) 3.4% (among SARS-CoV-2 + ve pts) | PE pts.: ICU admissions, 75% PE: 22% main PA, 34% lobar, 28% segmental, 16% subsegmental No differences in comorbidities between PE and no PE Selection bias (only severe cases/clinical deterioration with CTA) d-Dimer levels associated with PE |
Helms et al. France [31] | Prospective cohort 4 ICUs in 2 hospitals | 150 pts | 16.7% | Short follow-up in some patients (7Â days) PE mostly men (24/25, mean age 62Â years old) PE: 36% main PA, 32% lobar, 20% segmental and 12% subsegmental PE: detected at a median of 5.5Â days after ICU admission Thromboembolic events more common in COVID-19 ARDS compared to historic ARDS cohort All patients received at least standard dose thromboprophylaxis |
Klok et al. Netherlands* [32] | Retrospective cohort ICUs in 3 hospitals | 184 pts | 13.6% | 31% thrombotic complications Age and coagulopathy were independent predictors of thrombotic complications Median duration of follow-up per patient was 7Â days All patients received at least standard doses thromboprophylaxis |
Lodigiani et al. Italy [33] | Retrospective single-center cohort | 388 pts (61 ICU pts) | 2.6% overall 4.2% (of 48 closed ICU cases) | Thromboprophylaxis was used in 100% of ICU patients and 75% of those on the general ward Incidence may have been highly under-estimated due to the low number of specific imaging tests performed |
Llitjos et al. France [34] | Retrospective cohort 2 ICUs | 26 pts | 23% | Duplex ultrasound performed as standard of care 31% (n = 8) of prophylactic anticoagulation and 69% (n = 18) of therapeutic anticoagulation |
Poissy et al. France [35] | Retrospective cohort ICU | 107 pts | 20.6% | PE occurred within a median 6Â days after ICU admission Despite a similar severity on admission to the ICU, the frequency of PE in COVID-19 patients was twice higher than the frequency in the control period and in 40 influenza patients All patients received at least standard doses thromboprophylaxis Low number of associated DVTs d-Dimer levels, plasma factor VIII activity, and factor Willebrand antigen levels were associated with a greater PE risk |
Beun et al. Netherlands [36] | Retrospective cohort ICU | 75 pts | 26.6% | High-dose UFH of more than 35,000Â IU/day reported in 4 patients with PE due to heparin resistance Factor VIII, fibrinogen, and d-dimer levels were elevated, while almost all of the antithrombin levels were in the normal range in all patients |
Middeldorp et al. Netherlands [37] | Retrospective single-center cohort COVID-19 according to +ve RT-PCR or high clinical suspicion | 198 pts (75 ICU) | 6.6% overall 15% ICU | All patients received at least standard doses thromboprophylaxis Median follow-up duration was 15Â days in ICU patients and 4Â days in ward patients PE: 8% central, 77% segmental, 15% subsegmental High d-dimer levels, low lymphocytic count associated with thromboembolic manifestations |
Wichmann et al. Germany [38] | Autopsy study COVID-19 according to +ve RT-PCR | 12 pts | 33.3% | DVT in 7 of 12 patients (58%) in whom venous thromboembolism was not suspected before death In all patients, SARS–CoV-2 RNA was detected in the lung at high concentrations 5 of 12 patients demonstrated high viral RNA titers in the liver, kidney, or heart |
Klok et al. Netherlands* [39] | Retrospective cohort - ICUs in 3 hospitals | 184 pts | 35.3% | Increasing follow-up from 7 to 14Â days increased the incidence of PE from 13.6 to 35.3% PE: 70.8 segmental or more proximal arteries, 29.8% subsegmental arteries |
Bompard et al. France [40] | Retrospective cohort 2 Hospitals | 135 pts COVID-19 + CTA | 23.7% | Sixty-three pts (47%) were outpatients seen at the emergency department Fifteen PE were diagnosed in outpatients at initial presentation whereas the remaining 17 were diagnosed in patients who had presented clinical deterioration during hospitalization PE: 31% proximal, 56% segmental, 13% multiple sub segmental pulmonary arteries 4 patients with PE died (13%) within a median of 26 days All patients received prophylactic anticoagulation |
Thomas et al. UK [41] | Retrospective Single center | 63 pts | 7.9% | PE, 20% sub-segmental, 40% segmental, 20% multiple segmental and 20% in a main pulmonary artery None of the patients that developed thrombosis had a history of either active cancer or VTE Very short follow-up (median 8Â days) |
Poyiadi et al. USA [42] | Retrospective Multicenter | 328 pts COVID-19 + CTA | 22% | PE: 51% segmental, 31% lobar, 13% central, 5.5% subsegmental 28/122 (23%) of all patients that were on venous thromboprophylaxis developed a PE Statin therapy associated with lower and BMI > 30 kg/m2, d-dimer of 6 μg/mL with higher risk of developing PE |
Galeano-Valle et al. Spain [43] | Prospective Single center | 785 pts COVID-19 | 1.9% | PE: 40% had intermediate–high risk PE and 60% patients had low risk PE Non-ICU setting, low severity of illness |
Stoneham et al. UK [44] | Retrospective 2 hospitals | 274 pts Confirmed or highly suspected COVID-19 | 5.8% | White cell count, d-dimer, and fibrinogen associated with the occurrence of VTE in COVID-19 patients Almost all patients had an abnormal d-dimer result at baseline, defined as a d-dimer > 0.5 µg/mL Three patients were described to have resistance to anticoagulation |
Lax et al. Austria [45] | Autopsy study | 11 pts | 100% | Ten of the 11 patients received prophylactic anticoagulant therapy; Venous thromboembolism was not clinically suspected antemortem in any of the patients Thrombosis of small and mid-sized pulmonary arteries was found in various degrees in all 11 patients and was associated with infarction in 8 patients |