Left renal vein "Nutcracker" syndrome

The left kidney vein "nutcracker" syndrome test is an auxiliary diagnostic method for checking whether the kidney is normal. Left renal vein compression syndrome (leftrenalveinentrapmentsyndrome), also known as nutcrackerphenome-non (NCP), refers to mechanical compression of the left renal vein between the aorta and superior mesenteric artery. Caused by left renal venous hypertension and genital vein syndrome, manifested as hematuria and / or proteinuria, abdominal pain and other clinical symptoms. Anatomically, the left kidney is located close to the abdominal aorta (AO), and the right kidney is located close to the inferior vena cava (IVC). Therefore, the left renal vein (LRV) is longer than the right renal vein (RRV), and the right renal vein is directly injected into the IVC. The left renal vein needs to pass through the angle between the abdominal aorta and its branch superior mesenteric artery (SMA) to inject IVC. Normally this angle is 45 ° ~ 60 °, is filled with mesenteric fat, lymphoid tissue and peritoneum, so that it does not squeeze LRV, but when the angle is reduced (<30 °), such as puberty develops faster, height is rapid Growth, excessive spine stretching, rapid changes in body shape, or sagging of the kidney, rectus or supine position, swollen lymph nodes, and tumor compression can all lead to clinical signs of LRV compression (ie, "nutcracker phenomenon"). Basic Information Specialist classification: urinary examination classification: urine / kidney function test Applicable gender: whether men and women apply fasting: not fasting Tips: Maintain normal sleep and diet. Normal value Normally, the angle between the superior mesenteric artery and the abdominal aorta is filled with the mesentery, fat, lymph nodes, and peritoneum, so the left renal vein is not crushed. Clinical significance Abnormal results: the left renal vein "nutcracker" syndrome was positive. The angle is less than 30 degrees, such as rapid development of puberty, rapid growth of height, excessive stretching of the spine, rapid changes in body shape or sagging of the kidney, straight or supine position, swollen lymph nodes and tumor compression. People who need to be examined: suspected of abnormal kidneys. Precautions Taboo before check: Maintain normal sleep and diet. Requirements for examination: The patient should actively cooperate with the doctor and the doctor should check it carefully to avoid the result. Inspection process Ultrasound has obvious advantages in the diagnosis of nutcracker syndrome. Ultrasonography can clearly show the anatomy of the abdominal aorta, superior mesenteric artery and left renal vein. The maximum diameter of the proximal segment of the left renal vein can be found in different cross sections. The measured value is accurate, and the angle between the superior mesenteric artery and the abdominal aorta can be observed and measured. Color Doppler flow velocity provides more accurate hemodynamic changes and contributes to the diagnosis of this disease. Ultrasonography can also exclude hematuria caused by congenital malformations, trauma, tumors, stones, infectious diseases and vascular abnormalities. Not suitable for the crowd Inappropriate people: Generally, there is no suitable for the crowd. Adverse reactions and risks No related complications or hazards.