DIAGNOSTIC ACCURACY OF CT HOUNSFIELD UNIT FOR DETECTION OF CALCIUM STONES IN PATIENTS WITH RENAL STONE DISEASE
Main Article Content
Keywords
Computed tomography, Kidney stones, Nephrolithiasis
Abstract
Objective
To assess diagnostic accuracy of CT Hounsfield for calcium stones in patients with renal stone disease taking stone chemical composition as gold standard.
Methodology
A descriptive, cross-sectional study was conducted at the Department of Urology, Allied Hospital, Faisalabad from 20 August 2019 to 19 February 2020. A total of 201 patients aged 15-60 years with kidney stones undergoing percutaneous nephrolithotomy were included in the study by non-probability consecutive sampling. Non-CT scan was performed using GE-128 slice and Hounsfield unit was determined. All patients underwent PCNL and extracted stones were sent for analysis.
Results
CT Hounsfield unit had a sensitivity of 93.14%, specificity of 91.92%, positive predictive value of 92.23% and a negative predictive value of 92.54%. There was no significant difference between overall accuracy between patients aged 15-40 years vs older patients i.e. 92.67% and 92.16%, respectively. An accuracy of 94.92% was recorded in males which was significantly higher than 89.16% in females. Highest accuracy was for stones in middle calyx i.e. 95.35% and lower calyx i.e. 92.63%.
Conclusion
Hounsfield unit has a high accuracy for diagnosis of calcium stones in patients with renal stones. It is also an efficient tool for differentiating different stone types by composition.
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Dr Muhammad Farhan Azeem
Assistant Professor, Urology, University Medical and Dental College Faisalabad
Dr Umair Afzal
SR, Urology and Kidney Transplant, Shaikh Zayed Hospital Lahore
Dr Ayaz Ahmad
SR, Urology, University Medical and Dental College Faisalabad
Dr Shahzina Nayyab
SR, Radiology, University Medical and Dental College Faisalabad
Dr Inam Ul Haq
MO, General Surgery, DHQ Hospital Sheikhupura
Dr Imran Ul Haq Chaudhary
MO, Urology and Kidney Transplant, Shaikh Zayed Hospital Lahore