Results of thrombectomy in lower-extremity ischemia in patients with COVID-19 and respiratory failure of different severity

ABSTRACT

Aim. To analyze the results of thrombectomy in lower-extremity ischemia in patients with coronavirus disease 2019 (COVID-19) and respiratory failure of different severity. Material and methods. This retrospective, cohort, comparative study for the period from May 1, 2020 to March 1, 2022 included 305 patients with acute lower-extremity ischemia and COVID-19. Depending on the type of oxygen support, three groups of patients were formed group 1 (n=168) - nasal oxygen insufflation;group 2 (n=92) - non-invasive ventilation (NIV);group 3 (n=45) - artificial ventilation (AV). Thrombectomy was carried out according to the standard technique using Fogarty catheters (3F-6F - depending on the vessel size). After the diagnosis was established before and after the start of surgical treatment, all patients received the following therapy Unfractionated IV heparin infusion at an initial rate of 1000 U/r, adjusted to maintain the activated partial thromboplastin time at 2-3 times the normal value;2. Oral acetylsalicylic acid 125 mg;3. Analgesics. Results. Myocardial infarction and ischemic stroke were not detected in the total sample. The highest number of deaths (group 1 5,3%, n=9;group 2 72,8%, n=67;group 3 100%, n=45;p<0,0001), retrombosis (group 1 18,4%, n=31;group 2 69,5%, n=64;group 3 91,1%, n=41;p<0,0001) and limb amputations (group 1 9,5%, n=16;group 2 56,5%, n=52;group 3 91,1%, n=41;p<0,0001) was recorded in group 3 patients. Conclusion. In patients receiving mechanical ventilation, COVID-19 have more aggressive course, which is expressed in an increase in laboratory para-meters (C-reactive protein, ferritin, interleukin-6, D-dimer), the severity of pneumonia and location of thrombosis in the tibial arteries. Among patients with COVID-19 receiving mechanical ventilation, the greatest number of re-thromboses (91,1%), limb amputations (91,1%), and deaths (100%) are noted, which suggests the expediency of abandoning open thrombectomy in favor of anticoagulant/antiplatelet therapy in this cohort of patients. The development of arterial thrombosis in patients with COVID-19 receiving mechanical ventilation is an indicator of a high risk of death. Open thrombectomy in combination with anticoagulant/antiplatelet therapy is most effective in patients on nasal oxygen insufflation or NIV. Copyright © 2022, Silicea-Poligraf. All rights reserved.