9%20ECOGRAFIA%20ABDOMINAL%20COMO%20CUANDO%20DONDE

THE RENAL TRACT 157
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Figure 7.3 (A) Colour Doppler of the RK in coronal section demonstrates normal global intrarenal perfusion
throughout the kidney. (B) TS through the LK demonstrates the main renal vein (blue) draining into the IVC. The main
renal artery can be seen in red alongside. (C) The waveform from the main renal artery at the hilum of the kidney is of
low resistance with good end-diastolic flow. The spectrum from the adjacent vein can be seen below the baseline.
(D) Coronal section through the aorta (AO) showing the origin of the left renal artery. The blue colour in the proximal
section of the artery is an aliasing artefact due to the strong Doppler signal from this part of the vessel, which is
parallel to the beam. (Compare this with the aorta, which, because of its relatively perpendicular angle with the beam,
has a poor Doppler signal, despite its high velocity in reality.)
Assessment of renal function
Blood and urine tests can be useful indicators of
pathology. Frequently, the request to perform
ultrasound is triggered by biochemical results outwith
the normal range. Raised serum levels of urea
and creatinine are associated with a reduction in
renal function. However, any damage is usually
quite severe before this becomes apparent. The
creatinine clearance rate estimates the amount of
creatinine excreted over 24 h, and is a guide to the
glomerular filtration rate (normal glomerular filtration
rate 100–120 ml/min). A poor rate of clearance
(ml/min) is indicative of renal failure.
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