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MedicalExpress

versión impresa ISSN 2318-8111versión On-line ISSN 2358-0429

Resumen

SILVA, Tennyson Rene  y  LIMA, Marcelo Lopes de. Correlation between Hounsfield Unit Value and Stone Composition in Nephrolithiasis. MedicalExpress (São Paulo, online) [online]. 2016, vol.3, n.3, M160303. ISSN 2318-8111.  https://doi.org/10.5935/MedicalExpress.2016.03.03.

OBJECTIVE:

To examine whether the Hounsfield Unit value predicts calcium oxalate monohydrate stones in patients who are undergoing percutaneous nephrolithotomy.

METHOD:

119 patients who underwent percutaneous nephrolithotomy were prospectively evaluated between February 2012 and August 2014. Using thin cuts, the highest single-energy computed tomography attenuation value within a pixel was measured for each stone. Data regarding age and gender were assessed before surgery. The extracted stones were analyzed using infrared spectrophotometry.

RESULTS:

By receiver operating characteristics analysis, a cutoff value of 1548 Hounsfield Unit and an age of 42.5 years were used to determine the likelihood of a stone being composed of calcium oxalate monohydrate. A higher Hounsfield Unit value and increased age augmented the chances of a stone being composed of calcium oxalate monohydrate. In general, females had a greater likelihood of harboring calcium oxalate monohydrate stones than males.

CONCLUSION:

The maximum Hounsfield Unit value, as determined by unenhanced single-energy computed tomography in association with gender, predicts the presence of calcium oxalate monohydrate stones in patients who are undergoing percutaneous nephrolithotomy.

Palabras clave : Urinary Calculi; Lithotripsy; Tomography; Hounsfield Unit.

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