Abstract: Objective To study the association between changes of hemodynamic parameters of color Doppler flow image(CDFI) and occurrence of deep veins thrombosis(DVT) in elderly bedridden patients. Methods A total of 60 elderly subjects, including 26 elderly patients with lower limbs DVT and 34 cases without DVT were recruited into the study. The 26 elderly patients(thrombosis group) were suffered from lower limbs DVT after 3 days to 1 month of the first examination. And the other 34 cases(control group) had not suffered from the DVT of the lower limbs for at least 6 months after the first examination. Images and hemorhrological parameters of CDFI in these 60 patients were analyzed. The structures, echogenic, CDFI and pulse Doppler flow images of deep veins were observed. The interior diameters and peak velocities of popliteal vein(POV) and common femoral vein(CFV) were measured. Results Compared with cases of the control group, interior diameters of deep veins in thrombosis group were wider, and peak velocities were slowed down before the lower limbs DVT occurred(P<0.05 or P<0.01). And when peak velocities were slower than 14 cm/s, the occurrence of DVT was higher. Conclusion Lower limbs deep veins can be observed by CDFI, and the peak velocities can be measured correctly, especially those slower than 14 cm/s. Circulation disorder of lower limbs can result in blood congestion, and DVT, especially in elderly bedridden patients.

Key words: deep venous thrombosis, color doppler flow image(CDFI), hemodynamic