6. Comparison of ultrasonography and CT scanning in the detecting renal stone without posterior acostic shadow

Background: Kidney stones or nephrolithiasis is a common disease among men and women. Many studies have highlighted the prevalence and incidence of this disease. The role of imaging measures in the first encounter with a patient suspected of having kidney stones, as well as their treatment and follow up is very important. Many studies have been done to find the best and most accurate imaging method for patients with kidney stones. Many studies show that ultrasound does not have the sensitivity and accuracy required for posterior shading stones or rocks under 5 mm. It is advisable to have a CT scan in such cases before the treatment is based on the estimated size .The aim of this study was to measure the accuracy of ultrasound in estimating the size of stones in a standard CT scan. Methods: This analytical cross-sectional study was conducted in the autumn of 1396 among patients who referred to Baqiyatallah Hospital, with a complaint of renal colic and clinical suspicion of kidney stones. Sampling method was done randomly. The sample size was calculated using the same studies and Pukak formula with a 10% increase. Information needed during the hospitalization was drawn up by a checklist based on age, sex, weight, BMI, type, amount and number of kidney stones. The ultrasound and stereotypes report of the photo is adapted. A urologist does an ultrasound. In the absence of a posterior shadow, the stone is sent to the spiral CT scan confirmation. Ultimately the answer to the CT scan is compared. Exclusion criteria included pregnancy and EP, suspected hemorrhage, unstable hemodynamics. This study was approved at the Ethics Committee of the University of Medical Sciences. Our data were analyzed with Spss v.19 (p <0.05). Results: In this study, 59 patients were enrolled, of which 86.6% were male and the rest were female patients. The mean age, height, weight, and BMI of patients were 51 ± 10.32 years, 168 ± 9.1 cm, 76.9 ± 11.93 kg, and 26.79 ± 2.80. According to the results of this study, the sensitivity of ultrasound to detect 34% and its specificity is 56%. The positive predictive value was 31%, negative predictive value was 34%, and the accuracy of the study was 40.7%. The probability of stomach failure increased with increasing BMI. OR: 1.2. Conclusion: In this study, which was done on posterior shading stones, ultrasound sensitivity and accuracy were not appropriate in determining the size and it was recommended that CT scan was used in these cases.

کلیدواژه ها:

Nephrolithiasis ، Ultrasonography ، CT scan ، sensitivity ، Specificity ، without a posterior shadow