Abstract Book - 26th ESPU Congress, Joint Meeting with ICCS + SPU + AAP/SOU + AAPU + SFU

09:33 - 09:36

S5-4

(PP)

ANALYSIS OF RENAL ULTRASONOGRAPHY MEASURES RELATED TO BODY

HABITUS AND PRONE AND SUPINE POSITIONS

Linda SHORTLIFFE

, Erik KOUBA

and Beverly NEWMAN

1) Stanford University, Urology; Pediatric Urology, Stanford, USA - 2) Stanford University, Urology, Stanford, USA - 3)

Stanford University, Radiology, Stanford, USA

PURPOSE

Quantitative renal ultrasonography (RUS) parameters are an important part of the pediatric urinary tract assessment,

but these are often obtained when the kidney is best imaged whether prone or supine. This prospective study

determines the effect of prone and supine positions and general body habitus on renal sonographic measurements of

renal parenchymal area in children.

MATERIAL AND METHODS

With IRB approval planar renal parenchymal area (RPA) and length were determined during RUS in supine and prone

positions. Exclusion was inability to position or measure kidney dimensions in both positions. Body habitus was

classified by Center for Disease Control body mass index charts (normal, overweight, or obese). Data was analyzed by

Pearson correlation (prone vs. supine) and Bland-Altman analyses (scatterplot of mean and differences between

positional values).

RESULTS

From October 2010 to January 2011, 213 children had studies and 177 (mean 58.6 months; range 0.3-215 months)

were included. 122 children had complete data for body habitus (84 normal, 19 overweight, 19 obese.) RPA determined

in prone vs. supine positions showed high correlation (Pearson Correlation 0.90; p<0.01); however, Bland-Altman

analysis showed variance due to position was >50% of mean. Further analyses showed neither systematic bias of

measured kidneys nor body habitus influenced results.

CONCLUSIONS

This analysis shows that sonographic RPA from prone and supine positions correlate well, but cannot be compared

(prone and supine RPA cannot be used interchangeably) for clinical assessment. Quantitative ultrasonography measures

(RPA) should be made in the same position for clinical assessment regardless of body habitus and should be

standardized.