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An Immature Murine Model of Reversible Unilateral Ureteral Obstruction
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Flow rate models in renal obstruction.

J P Coffey1

  • 1Nuclear Medicine Department, Royal Preston Hospital, Lancashire Teaching Hospitals NHS Trust, Preston, PR2 9HT, UK. John.coffey@lthtr.nhs.uk

World Journal of Urology
|June 1, 2010
PubMed
Summary
This summary is machine-generated.

New modeling of renogram time activity curves (TACs) shows reduced afferent flow rate parameters in acute kidney obstruction. This method is more sensitive to early parenchymal dysfunction than traditional divided renal uptake measurements.

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Area of Science:

  • Nuclear medicine
  • Renal physiology
  • Medical imaging analysis

Background:

  • Divided renal uptake measurements may not detect early changes in renal plasma flow (RPF) in acute unilateral renal obstruction.
  • Afferent flow rate parameters from renogram time activity curves (TACs) may offer a more sensitive indicator of renal function.
  • This study investigates the utility of optimized models of renogram TACs to assess early renal obstruction.

Purpose of the Study:

  • To analyze afferent flow rate parameters from optimized renogram models.
  • To compare the sensitivity of afferent flow rate parameters versus divided renal tracer uptake in detecting early renal obstruction.
  • To evaluate the feasibility of optimized modeling for assessing renal parenchymal dysfunction.

Main Methods:

  • Analyzed 24 background-corrected renogram TACs from patients with unilateral obstructive patterns and 6 normal controls.
  • Utilized 99mTc-labelled mercapto-acetyl-triglycine (MAG3) tracer.
  • Constructed optimized computed models of each TAC using specialized software and the Marquardt Least Squares method to calculate afferent flow rate parameters.

Main Results:

  • Afferent flow rate parameters were significantly reduced in acutely obstructed kidneys compared to normal kidneys (0.15 vs. 0.44, P<0.005).
  • The reduction in afferent flow rate parameters was more pronounced than the reduction in differential tracer uptake (divided renal function).
  • Obstructed kidneys showed a mean divided renal function of 0.3 compared to 0.45 in controls (P<0.05).

Conclusions:

  • Optimized modeling of renogram TACs is feasible for analyzing obstructed kidneys.
  • Afferent flow rate parameters derived from optimized models may serve as a more sensitive index of early parenchymal dysfunction in renal obstruction.
  • This approach could improve the early detection of renal dysfunction in obstructive conditions.