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J Urol. 2016 Feb;195(2):471-5. doi: 10.1016/j.juro.2015.09.085. Epub 2015 Oct 8.

Measurement of Differential Renal Function by Scintigraphy in Hydronephrotic Kidneys: Importance of Conjugate Views for Accurate Evaluation.

Author information

1
Children's Hospital of Orange County, Orange, California; University of California Irvine Medical Center, Orange, California.
2
Division of Urology, Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada.
3
University of California Irvine Medical Center, Orange, California.
4
Division of Nuclear Medicine, Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada.
5
Division of Urology, Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada. Electronic address: psalle@sidra.org.

Abstract

PURPOSE:

Traditionally a single posterior view is used to measure differential renal function during nuclear renal scintigraphy. Nevertheless, experimental data show important variation in this measurement in the setting of significant hydronephrosis. To date, the impact of degree of hydronephrosis on the accuracy of differential renal function determination has not been addressed. We evaluated the discrepancy between function measured by anterior and posterior views, and the relationship to varying degrees of hydronephrosis.

MATERIALS AND METHODS:

We retrospectively reviewed consecutive mercaptoacetyltriglycine renal scans from 2009 to 2011. Ultrasounds were reviewed and degree of hydronephrosis was recorded using anteroposterior pelvic diameter. Absolute percent difference in differential renal function between each view (anterior minus posterior) was calculated and correlated to anteroposterior pelvic diameter. Patients were stratified into 4 groups according to anteroposterior pelvic diameter, ie less than 10 mm, greater than 10 mm, greater than 15 mm and greater than 25 mm.

RESULTS:

A total of 519 scans with corresponding ultrasounds were analyzed. Median patient age was 2.26 years. Kidneys with a larger anteroposterior pelvic diameter had a greater discrepancy in function on anterior and posterior views. There was a meaningful discrepancy for anteroposterior pelvic diameter greater than 10 mm (p = 0.034) and greater than 25 mm (p = 0.032). Several statistical models were used to identify a meaningful cut point of 15 mm, where the discrepancy in anterior and posterior views became significant (p = 0.001).

CONCLUSIONS:

The use of single views during nuclear renography for grossly hydronephrotic kidneys is often inaccurate. The discrepancy in differential renal function obtained on the anterior and posterior views is adversely impacted especially as anteroposterior pelvic diameter increases beyond 15 mm. Therefore, we suggest incorporation of conjugate views for estimating differential renal function in patients with hydronephrosis.

KEYWORDS:

hydronephrosis; kidney function tests; pediatrics; radionuclide imaging; technetium Tc 99m mertiatide

PMID:
26454101
DOI:
10.1016/j.juro.2015.09.085
[Indexed for MEDLINE]

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