Legends:

Figure 1. Radiographic information and IVC filter implantation of patient 1.

(A ) At day 6, X-ray radiography showed a blurred texture of bilateral lungs. (B ) At day 10, representative COVID-19 lesions could be seen in bilateral lungs. (C-D ) IVC filter implantation was successfully performed with the aid of DSA guiding. The IVC was patent. (E ) At day 13, there were fewer inflammatory lesions compared to day 6 (A ). (F ) At day 23, the follow-up CT scan showed fewer inflammatory lesions compared to the day 10 CT image (B ).

Figure 2. Bedside ultrasound-guided IVC filter implantation of patient 2 on the isolation ward.

(A-B ) Severe ischemia signs were observed in the right thigh and left toes. (C ) There was no blood flow in the right iliac artery and vein. (D ) The tip of the IVC filter sheath was adjusted to be 1 cm below the right renal vein. (E ) One retrievable inferior vena cava filter was implanted. (F ) At day 3, after emergent right thigh amputation surgery, X-ray radiography showed obvious inflammatory lesions in bilateral lungs. There was no shift of the inserted IVC filter. (G ) At day 9, in the intensive care unit, bedside X-ray radiography presented exacerbation in bilateral lungs. Black arrow indicates the inferior vena cava filter.

Figure 3. Radiographic information and bedside IVC filter implantation of patient 3.

(A-B ) At day 3, a CT scan showed representative COVID-19 lesions in transverse and coronal windows, respectively. (C-D ) X-ray radiography presented the compressed fractures in the 12th thoracic vertebrae (T12) and the 1st lumbar (L1) vertebrae. (E ) There was no blood flow in the left iliac vein. (F-G ) After adjusting the tip of the IVC filter sheath, one retrievable inferior vena cava filter was implanted 1 cm below the right renal vein. (H-I ) At day 9, X-ray radiography showed successful internal fixation surgery. There was no shift of the inserted IVC filter. (J-K ) At day 18, there were obviously fewer inflammatory lesions in transverse and coronal windows compared to day 4 (C-D ), respectively. Black arrow indicates the inferior vena cava filter.