Veterinary Teaching Hospital, Animal Science Graduate Program, Franca University, Franca, São Paulo, Brazil.
Practicing Veterinarian Radiologist in Rio Grande do Sul, Canoas, Rio Grande do Sul, Brazil.
PLoS One. 2022 Sep 22;17(9):e0274087. doi: 10.1371/journal.pone.0274087. eCollection 2022.
The purpose of this study was to evaluate and compare positive cystography techniques at 5%, 10%, and 20%, as well as three different double-contrast protocols for detecting radiolucent uroliths with a diameter of less than 3.0 mm in dogs. Six cadavers were used, one was selected at random to represent the negative control, and the others were submitted to urolith implantation in the bladder by urethral catheter. Three radiology professionals blindly accessed ventrodorsal and -lateral projections of each test. Contrast at 20% showed greater diagnostic sensitivity, but with greater difficulty identifying the number and size of the uroliths. Consequently, double-contrast techniques are better and should be used for diagnostic and therapeutic planning. Sensitivity and specificity tests demonstrated that positive 5% cystography and different concentrations of double contrast obtained better results in terms of sensitivity and specificity. However, due to the presence of a greater amount of artifacts in the 5% cystography, it is suggested that double contrast is used for this purpose, especially with the removal of contrast excess (protocol 2).
本研究旨在评估和比较 5%、10%和 20%的阳性膀胱造影技术，以及三种不同的双重对比方案，以检测直径小于 3.0 毫米的狗的透光性尿路结石。使用了 6 具尸体，随机选择 1 具作为阴性对照，其余的通过尿道导管植入膀胱。三位放射学专业人员对每个测试的背腹和侧位投影进行了盲目评估。20%的造影剂显示出更高的诊断灵敏度，但更难以识别结石的数量和大小。因此，双重对比技术更好，应用于诊断和治疗计划。敏感性和特异性测试表明，阳性 5%膀胱造影和不同浓度的双重对比在敏感性和特异性方面获得了更好的结果。然而，由于 5%膀胱造影中存在更多的伪影，建议使用双重对比进行此项检查，特别是在去除多余的造影剂时（方案 2）。
