Contrast‐enhanced ultrasound voiding cystography as a screening examination for vesicoureteral reflux in the follow‐up of renal transplant recipients: a new approach
| Autor: | Andrej Kmetec, Aljos˘a Kandus, Jurij Fettich, Jadranka Buturović-Ponikvar, Andrej Bren |
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| Rok vydání: | 2001 |
| Předmět: |
Adult
Male medicine.medical_specialty media_common.quotation_subject Urinary system Urology Contrast Media urologic and male genital diseases Urination Vesicoureteral reflux Cystography Humans Medicine Radionuclide Imaging Ultrasonography media_common Vesico-Ureteral Reflux Transplantation medicine.diagnostic_test business.industry Ultrasound Reflux Technetium Middle Aged medicine.disease Kidney Transplantation female genital diseases and pregnancy complications Nephrology Urinary Tract Infections Female business Contrast-enhanced ultrasound |
| Zdroj: | Nephrology Dialysis Transplantation. 16:120-123 |
| ISSN: | 1460-2385 0931-0509 |
| Popis: | Background The aim of the study was to evaluate a new diagnostic procedure, ultrasound contrast-enhanced voiding cystography (USVC), for vesicoureteral reflux (VUR) in renal transplant recipients and to compare it with radionuclide voiding cystography (RVC). Methods Twenty-three renal transplant recipients with recurrent urinary tract infection were investigated simultaneously by RVC and USVC. After catheterization, the empty bladder was filled with normal saline (mean 250+/-30 ml) and 30-45 mBq of (99m)Tc-labelled colloid. At the end of filling the bladder, 19.5 ml of galactose-based, microbubble-containing echo-enhancing agent, at a concentration of 200 mg/ml, was instilled. During the filling and voiding phases the movement of the radiotracer was recorded by a gamma camera and the presence of microbubbles in the urinary tract by ultrasound. RVC was used to detect and grade the degree of VUR. Results Nuclear studies identified VUR in 16 (69.6%) of 23 recipients with recurrent urinary tract infection: VUR grade I in three (13%) recipients, grade II in eight (34.8%) and grade III in five (21.7%) using a simplified grading system. USVC with contrast-enhancement detected VUR in 14 (60.9%) recipients. Overall sensitivity and specificity of contrast-enhanced USVC was 75 and 71%, respectively. Statistical analysis showed that the accuracy of this procedure increased with higher grades of VUR and its sensitivity reached 100% for detection of VUR grade III. Conclusion In our preliminary study, contrast-enhanced USVC has proved to be an effective examination, with the same accuracy rate as RVC in detecting grade III VUR episodes with low diagnostic accuracy for low reflux grades. |
| Databáze: | OpenAIRE |
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