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Original Research

The effect of the hounsfield unit value calculated with the aid of non-contrast computed tomography on the outcome of percutaneous nephrolithotomy


Bozyaka Training and Research Hospital, Department of Urology, Izmir, Turkey


DOI :
2016; 11 (2): 46-51

Abstract

Aim: In this study, we aimed relationship with hounsfield unit, which calculated with the aid of non-kontrast computed tomography and success and complications rates of percutaneous nephrolithotomy (PCNL)  which is applied for renal stones.

Materıal and Methods: We record retrospec-tively of patients who have non-contrast computed tomography operated at our institution between Ja-nuary 2013-January 2015 for renal stones in different locations. HU values were recorded. The patients were divided into two different groups according to houns-field unit value. Hounsfield unit value <1000 was defi-ned group 1 and >1000 was defined group 2. Between two groups, operative time, operation success and complication rates were compared. <4mm remaining stone and stone- free were defined as having a suc-cessful operation. After the operation, > 4 mm stone was defined as residual determination.

Results: Group 1 consists of 114 patients and group 2 consists of 180 patients. The mean age of pa-tients was similar; Mean ages of group 1 and group 2 were 49.6±1.3 and 48.7±0.9 respectively (p=0.496). Mean hounsfield unit value of group 1 ans group 2 were 749.7±19.2 and 1361.3±16.6 respectively (p=<0.001). Mean stone burden of group 1 and gro-up 2 were 579.48±52.9 mm2 and 547.04±38.6 mm2 respectively (p=0.614). Mean operative time was 110.4±4.5 min. in group 1 and 107.7±2.8 min. in group 2 (p=0.593). Scopy times were 86.2±5.4 sec. in group 1 and 88.1±4.9 sec in group 2 (p=0.802). Resi-dual fragmants were detected in 29 (25.4 %) and 51 (28.3%) patients for groups 1 and 2 respectively and groups were similar (p=0.587).

Conclusion: Hounsfield unit which was detected computed tomography is not a sufficient factor alone to predicting success and complication rates of PCNL.

Keywords: Kidney stones; percutaneous nephro-lithotomy; hounsfield unit; non-contrast abdominal computed tomography.


Abstract

Aim: In this study, we aimed relationship with hounsfield unit, which calculated with the aid of non-kontrast computed tomography and success and complications rates of percutaneous nephrolithotomy (PCNL)  which is applied for renal stones.

Materıal and Methods: We record retrospec-tively of patients who have non-contrast computed tomography operated at our institution between Ja-nuary 2013-January 2015 for renal stones in different locations. HU values were recorded. The patients were divided into two different groups according to houns-field unit value. Hounsfield unit value <1000 was defi-ned group 1 and >1000 was defined group 2. Between two groups, operative time, operation success and complication rates were compared. <4mm remaining stone and stone- free were defined as having a suc-cessful operation. After the operation, > 4 mm stone was defined as residual determination.

Results: Group 1 consists of 114 patients and group 2 consists of 180 patients. The mean age of pa-tients was similar; Mean ages of group 1 and group 2 were 49.6±1.3 and 48.7±0.9 respectively (p=0.496). Mean hounsfield unit value of group 1 ans group 2 were 749.7±19.2 and 1361.3±16.6 respectively (p=<0.001). Mean stone burden of group 1 and gro-up 2 were 579.48±52.9 mm2 and 547.04±38.6 mm2 respectively (p=0.614). Mean operative time was 110.4±4.5 min. in group 1 and 107.7±2.8 min. in group 2 (p=0.593). Scopy times were 86.2±5.4 sec. in group 1 and 88.1±4.9 sec in group 2 (p=0.802). Resi-dual fragmants were detected in 29 (25.4 %) and 51 (28.3%) patients for groups 1 and 2 respectively and groups were similar (p=0.587).

Conclusion: Hounsfield unit which was detected computed tomography is not a sufficient factor alone to predicting success and complication rates of PCNL.

Keywords: Kidney stones; percutaneous nephro-lithotomy; hounsfield unit; non-contrast abdominal computed tomography.