BackgroundThe calculation of the volume ratio between the hernia sac and the abdominal
cavity of incisional hernias is based on tomographic sections as well as the
mathematical formula of the volume of the ellipsoid, which allows determining
whether this is a giant hernia or there is a "loss of domain". As the images used
are not exact geometric figures, the study of the volume of two solid organs of
Wistar rats was performed to validate these calculations.AimTo correlate two methods for determining the volume of the kidney and spleen of
rats, comparing a direct method of observation of the volume with the mathematical
calculation of this value.MethodsThe volume of left kidney, geometrically more regular, and spleen, with its
peculiar shape, of ten animals was established in cubic centimeters after complete
immersion in water with the aid of a beaker graduated in millimeters. These values
were compared with those obtained by calculating the same volume with a specific
mathematical formula: V = 4/3 × π × (r1 x r2 x r3). Data were compared and
statistically analyzed by Student's t test. RESULTS: Although the average volume
obtained was higher through the direct method (1.13 cm3 for the left
kidney and 0.71 cm3 for the spleen) than the values calculated with
the mathematical formula (0.81 cm3 and 0.54 cm3), there were
no statistically significant differences between the values found for the two
organs (p>0.05).ConclusionThere was adequate correlation between the direct calculation of the volume of the
kidney and spleen with the result of mathematical calculation of these values in
the animals' studies.
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