{"id":282,"date":"2018-07-01t12:00:21","date_gmt":"2018-07-01t02:00:21","guid":{"rendered":"\/\/www.iolishoes.com\/?page_id=282"},"modified":"2023-03-31t20:33:12","modified_gmt":"2023-03-31t09:33:12","slug":"renal-arteries-normal","status":"publish","type":"page","link":"\/\/www.iolishoes.com\/renal-arteries-normal\/","title":{"rendered":"renal arteries normal"},"content":{"rendered":"\t\t
this is directly examining the main extra-renal arteries.<\/em><\/p> involves:<\/p> anterior approach<\/strong> anterior approach.the patient is lying supine and the probe is moved inferiorly and superiorly to identify the renal arteries and any supernumerary arteries.look in b-mode and colour doppler to help identify.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t a spectral analysis is made of the aorta at the level of the renal arteries. the velocity is taken with an angle for an accurate measurement.if an accurate angle (<60degrees) cannot be obtained then another measurement is taken with no angle so it can be compared to the renal artery at a stenosis site to do a renal artery:aorta\u00a0 ratio (rar ratio). this should be less than 3.5:1.\u00a0<\/p> the aorta is examined for any abdominal aortic aneurysm or stenosis.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t oblique approach<\/strong> oblique approach.<\/p> angling 45 degrees to right renal artery or rolling the patient in a semi left decubitus position to avoid the bowel gas and improve the doppler angle.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t oblique approach<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t anterior v’s oblique (ultrasound image)<\/p> oblique approach.<\/p> angling 45 degrees to right renal artery.in most individuals, the renal arteries arise from the abdominal aorta immediately distal to the origin of the sma.by moving the probe to the right of midline and angling toward the patient’s left, an acceptable doppler angle of 45-60 degrees is achieved<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t anterior approach. (ultrasound image)<\/p> the renal arteries are clearly imaged in b mode from an anterior approach however as it is perpendicular to the ultrasound beam it is not suitable for doppler assessment.<\/p> in most individuals, the renal arteries arise from the abdominal aorta immediately distal to the origin of the superior mesenteric artery (sma). the right renal artery passes underneath the inferior vena cava (ivc) and posterior to the right renal vein<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t anterior approach: ultrasound image of the left renal artery.<\/p> the left renal vein passes between the aorta and sma.<\/p> the left renal artery is located posterior to the renal vein.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
the renal arteries are clearly imaged in b mode from an anterior,subcostal approach however as it is perpendicular to the ultrasound beam it is not suitable for doppler assessment. supernumerary (duplicate) arteries can be seen looking posterior to the ivc in b mode and colour in a sagittal plane.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
by moving the probe intercostally to the right of midline and angling toward the patient’s left, an acceptable doppler angle of 60 degrees is achieved. to avoid aliasing set the colour scale high enough so it is minimized. if the scale is too low then it is difficult to determine which vessel is the vein and which vessel is the artery.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t