AAST kidney injury scale
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Renal trauma grading is often done using the American Association for the Surgery of Trauma (AAST) 3-4 according to depth of damage and involvement of the urinary collecting system and renal vessels:
- grade I: contusion or non enlarging subcapsular perirenal haematoma, and no laceration
- grade II: superficial laceration <1 cm depth and does not involve the collecting system (no evidence of urine extravasation), non expanding perirenal haematoma
- grade III: laceration >1 cm without extension into the renal pelvis or collecting system (no evidence of urine extravasation)
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grade IV
- laceration extends to renal pelvis or urinary extra-vasation
- vascular: injury to main renal artery or vein with contained haemorrhage
- segmental infarctions without associated lacerations
- expanding subcapsular haematomas compressing the kidney
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grade V
- shattered kidney
- avulsion of renal hilum: devascularisation of kidney due to hilar injury
- ureteropelvic avulsions
- complete laceration or thrombus of the main renal artery or vein
If a renal injury is seen on a routine portal phase CT of the abdomen, and there is no urine extravasation, a delayed series at 5-15 minutes should be considered to check for urine extravasation. This should not necessarily be performed if the patient is unstable or if there are other large life-threatening injuries.
See also
-</ul><h4>See also</h4><ul>- +</ul><p>If a renal injury is seen on a routine portal phase CT of the abdomen, and there is no urine extravasation, a delayed series at 5-15 minutes should be considered to check for urine extravasation. This should not necessarily be performed if the patient is unstable or if there are other large life-threatening injuries.</p><h4>See also</h4><ul>
Tags changed:
- trauma
- emergency medicine
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AAST Gradinggrading of renal trauma
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