Figure 1From: Blood stasis may cause thrombosis in the left superior pulmonary vein stump after left upper lobectomy Intraoperative ultrasonography. An ultrasound probe is placed at the pulmonary vein stump (a). The probe is carefully placed parallel to the staple line of the pulmonary vein stump. The velocity is recorded with pulse Doppler mode (b). The peak velocity in the pulmonary vein stump is measured. RIPV: Right inferior pulmonary vein.Back to article page