Population Covered By The Guidance
This pathway provides guidance on the imaging of adult patients with new onset or acutely worsening renal failure.
Date reviewed: January 2012
Date Published: January 2012
- Ultrasound is the modality of choice and is used to exclude obstructive uropathy and to assess renal size and contour
- In the absence of obstruction and evidence of pre-renal failure, the size and contour of the kidneys can be useful to assess the underlying cause of the renal failure
- Further imaging in non-obstructive uropathy depends on the provisional diagnosis. For example Doppler US may be used to assess for renal artery stenosis
References are graded from Level I to V according to the Oxford Centre for Evidence-Based Medicine, Levels of Evidence. Download the document
- Mucelli RP, Bertolotto M. Imaging techniques in acute renal failure. Kidney Int Suppl. 1998;53(S66):S102-5. (Review article)
- O'Neill WC. Sonographic evaluation of renal failure. Am J Kidney Dis. 2000;35(6):1021-38. (Review article)
- Gottlieb RH, Weinberg EP, Rubens DJ, et al. Renal sonography: can it be used more selectively in the setting of an elevated serum creatinine level? Am J Kidney Dis. 1997;29:362-7. (Level III evidence)
- Platt JF. Advances in ultrasonography of urinary tract obstruction. Abdom Imaging. 1998;23:3-9. (Review article)
- Platt JF. Doppler ultrasound of the kidney. Semin Ultrasound CT MR. 1997;18:22-32. (Review article)
- Platt JF. Duplex Doppler evaluation of native kidney dysfunction: obstructive and nonobstructive disease. AJR Am J Roentgenol. 1992;158:1035-42. (Review article)
- Fresco GF, DiGiorgio F, Curti GL. Simultaneous estimation of glomerular filtration rate and renal plasma flow. J Nucl Med. 1995;36(9):1701-6. (Level III evidence)
- Blaustein DA, Myint MM, Babu K, et al. The role of technetium-99m MAG3 renal imaging in the diagnosis of acute tubular necrosis of native kidneys. Clin Nucl Med. 2002;27:165-8. (Level IV evidence)
- Woolfson RG, Neild GH. The true clinical significance of renography in nephro-urology. Eur J Nucl Med. 1997;24(5):557-70. (Review article)
- Vasbinder GBC, Nelemans PJ, Kessels AGH, et al. Diagnostic tests for renal artery stenosis in patients suspected of having renovascular hypertension: a meta-analysis. Ann Intern Med. 2001;135:401-11. (Level I/II evidence). View the reference
- Radermacher J, Chavan A, Bleck J, et al. Use of Doppler ultrasonography to predict the outcome of therapy for renal-artery stenosis. N Engl J Med. 2001;344:410-7. (Level I/II evidence). View the reference
- Krijnen P, Van Jaarsveld BC, Steyerberg EW, et al. A clinical prediction rule for renal artery stenosis. Ann Intern Med. 1998;129:705-11. (Level II evidence). View the reference
- Pedersen EB. New tools in diagnosing renal artery stenosis. Kidney Int. 2000;57:2657-77. (Review article)
- Rankin SC, Saunders AJS, Cook GJR, et al. Renovascular disease. Clin Radiol. 2000;55:1-12. (Review article)
Pathway User Guide
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The relative radiation level (RRL) of each imaging investigation is displayed in the pop up box.
| SYMBOL | RRL | EFFECTIVE DOSE RANGE |
|---|---|---|
| None | 0 | |
| Minimal | < 1 millisieverts | |
| Low | 1-5 mSv | |
| Medium | 5-10 mSv | |
| High | >10 mSv |
Disclaimer
Status Of Recommendations Each pathway is designed to assist clinicians in situations when faced with a large array of possible diagnostic tests and examinations. However, it is recognised that diagnostic practice may differ from a particular pathway depending on local availability of equipment and expertise, as well as the experience of individual clinicians. Therefore each pathway is neither a rigid set of rules, nor a substitute for clinical assessment, and individual patient circumstances should always be considered.
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Ultrasound
Ultrasound
Modality of choice for renal imaging
- Modality of choice for renal imaging ,
- Routine use is not indicated ,
- Provides morphological and functional information useful for the diagnosis and management of specific pathological conditions leading to acute renal failure ,
- Helps differentiate potentially reversible acute renal failure from chronic end-stage renal disease ,
- Allows detection of obstruction, assessment of renal size and outline
- Renal size is usually normal in prerenal acute renal failure and it may increase in acute renal diseases such as acute tubular necrosis, interstitial nephritis and acute glomerular nephritis. Reduced size suggests a complicated underlying chronic nephropathy and worse prognosis
- Limitations ,
- Poor specificity
- False negatives may occur in early renal obstruction and in dehydrated patients
Differential Diagnosis Based On The Size And Contour Of The Kidneys
Differential Diagnosis Based On The Size And Contour Of The Kidneys
- Smooth, small kidneys - causes include chronic glomerulonephritis, renovascular cause and post-obstructive atrophy
- Scarred, small kidneys - causes include chronic pyelonephritis, tuberculosis and papillary necrosis
- Normal sized or large kidneys - causes include polycystic kidneys, renal vein thrombosis, infiltration and acute tubular necrosis
- Smooth, small kidneys
- chronic glomerulonephritis
- renovascular cause
- post-obstructive atrophy
- Scarred, small kidneys
- chronic pyelonephritis
- tuberculosis
- papillary necrosis
- Normal sized or large kidneys
- polycystic kidneys
- renal vein thrombosis
- infiltration
- acute tubular necrosis
Percutaneous Nephrostomy
Percutaneous Nephrostomy
Performed as a temporary means of urinary diversion
- Percutaneous nephrostomy is performed as a temporary means of urinary diversion
- A nephrostogram allows assessment of the level of obstruction and may also determine the cause
- If indicated, antegrade ureteric stenting can be performed through the nephrostomy tract
Renal Vessel Doppler Ultrasound
Renal Vessel Doppler Ultrasound
Provides information on blood flow velocities and waveform to detect stenosis
- Doppler gives information regarding blood flow velocities and waveform
- 63-100% sensitivity and 73-100% specificity for renal artery stenosis
- Doppler ultrasound can be used to distinguish renal obstruction from non-obstructive dilatation. A renal resistive index (RI) of 0.7 or less in the presence of dilatation of collecting system is supportive evidence of absence of functionally significant obstruction ,,
- A renal resistive index value of at least 0.8 reliably identifies patients with renal-artery stenosis in whom angioplasty or surgery will not improve renal function, blood pressure, or kidney survival
- Patients with abnormal US or high clinical suspicion of renal artery stenosis need to be further evaluated with MRA or CTA ,
- Advantages: non-invasive, relatively inexpensive, does not involve the use contrast material and no exposure to ionising radiation.
- Limitations: difficult in obese patients and where breath holding and cooperation are poor
Angiography
Angiography
Catheter or CT angiography involve use of iodinated contrast medium, which is usually contraindicated in acute renal failure. MR angiography is a useful alternative in these circumstances
- Catheter or CT angiography involves use of iodinated contrast medium, which is usually contraindicated in acute renal failure. MR angiography is a useful alternative in these circumstances
Renal Biopsy
Renal Biopsy
When the cause of declining renal function is not found and the clinical features are atypical of acute tubular necrosis, renal biopsy may be used to exclude potentially treatable conditions such as Wegener's granulomatosis, systemic lupus erythematosus, Goodpasture's syndrome or rapidly progressive glomerulonephritis
- When the cause of declining renal function is not found and the clinical features are atypical of acute tubular necrosis, renal biopsy may be used to exclude potentially treatable conditions such as Wegener's granulomatosis, systemic lupus erythematosus, Goodpasture's syndrome or rapidly progressive glomerulonephritis
Radionuclide Renal Scan
Radionuclide Renal Scan
Renal perfusion, filtration and excretion can be evaluated which are helpful in determining the potential for salvage
- Renal perfusion, filtration and excretion can be evaluated which are helpful in determining the potential for salvage ,,
- There are no comprehensive series describing DTPA or MAG3 renography in patients with acute renal failure and no evidence that serial renography contributes more to patient management than does the measurement of urine volume and creatinine content
ACUTE OR ACUTE-ON- CHRONIC RENAL FAILURE
ACUTE OR ACUTE-ON- CHRONIC RENAL FAILURE
Computed Tomography (CT)
Computed Tomography (CT)
CT should be considered to assess for a cause of obstruction such as renal-ureteric calculi, lymphadenopathy and retroperitoneal fibrosis
