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Bladder Shape Impact on the Ultrasonic Measurement of Bladder Volume in Children

US is used for noninvasive assessment of bladder shape and for calculation of bladder volume. Objective: To evaluate the impact of bladder shape on the accuracy of US estimation of bladder volume in children and to calcualte formulas for US estiimation of volume. Mat&Methods: US was performed in 146 children refered for urodynamic investigation. Three bladder diameters were measured, and bladder shapes cathegorized as round, ellipsoid, cuboid, triangular and undefined. Correction coefficients (k) were calculated for the whole sammple and for each bladder shape using LRA. Resutls: Round bladder shape was present in 23%, cuboid in 25%, ellipsoid in 21%, triangular in 25%, and 6% had an undefined shape. Correct.coefficients were 0.66 for the whole sample, 0.561 for round bladder, 0.92 for cuboid, 0.80 for ellipsioid, 0.623 for triangular, and 0.749 for undefined shape. MPE were significantly lower when using different k-s than errors when using k=0.5 applied to our data. Conslusion: Bladder shape has considerable impact on the accuracy of US estimationo of BV in children, and correction coefficients should be used for BV measurements of different bladder shapes.

urinary bladder; measurement technique; ultrasound; children

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