Patients exposed to a surgical safety checklist experience better postoperative outcomes, but this could simply reflect wider quality of care in hospitals where checklist use is routine.

A: The peak velocity in the LRV is 18.3 cm/sec. B; The peak velocity in the LRV in aortomesenteric portion is 110.8 cm/sec. There is evidence of "mosaic" color pattern due to the turbulent flow.A previously healthy, 31 year old woman was admitted to the emergency room with left flank pain and macrohaematuria, which began after jogging. The physical examinaTransversal scan of the abdomen. RK=Right kidney; LK=Left kidney; IVC=Inferior vena cava; AO=aorta; SMA=superior mesenteric artery, LRV=left renal vein. The arrow indicates the point of LRV compression. Panel Btion and her vital signs were normal. Ultrasonography showed that both kidneys were of normal size and echostructure, with no hydronephrosis or bladder abnormalities. The left renal vein (LRV) was enlarged (15 mm) with a winding course. Examination by Doppler ultrasound showed that blood flow was low with evidence of spontaneous echo contrast. The LRV was narrow (2 mm) between the aorta and the superior mesenteric artery (SMA) (Panel A). Color Doppler ultrasound showed a "mosaic" pattern of blood flow in the LRV, beyond the origin of the SMA. The peak velocity of systolic blood flow measured in the hilar tract and in the aortomesenteric portion of the LRV was 18.3 cm/sec and 110.8 cm/sec respectively (ratio 6.05), with a pressure gradient of 5 mmHg (Panel B). Diagnosis: Renal NutPanel A