Fig. 2From: Venous Doppler ultrasound in critically Ill COVID-19 patients: game changer in anticoagulation therapyAbsence of collapse after compression with the ultrasound transducer. With the transducer in the same position as Fig. 1, pressure is exerted. In the absence of thrombosis, the veins should collapse. In this case, they not collapse (arrows). This maneuver helps to confirm thrombosis of the right side vein (green arrow)Back to article page