Ultrasound screening strategies for the diagnosis of congenital anomalies of the kidney and urinary tract.

PURPOSE: Congenital anomalies of the kidneys and urinary tract (CAKUT) are among the most common anomalies in newborn infants, and may cause chronic renal disease in newborns. We investigated the sensitivity and specificity of different ultrasound-based screening strategies for CAKUT. MATERIALS AND METHODS: Newborns (n = 4331) were analyzed for CAKUT in at least one ultrasound examination as a part of the Survey of Neonates in Pomerania (SNiP), a 7-year population-based study on neonates in Western Pomerania (Germany). Intrauterine ultrasound examinations were compared with early postnatal ultrasound findings (from days 3 - 7 of life) and pathological findings within the first 6 months of postnatal life. RESULTS: Cases of CAKUT were detected in 309 (3.7 %) kidneys in one ultrasound examination at the following points of time at least: (i) prenatally in 56 newborns (18.2 %), (ii) 3 - 7 days postnatally in 201 newborns (65.2 %) and (iii) in 52 newborns (17 %) during the 6-month follow-up. The prevalence was significantly higher in male infants, and hydronephrosis was found to be the most frequent obstructive nephropathy (83.3 %). Significant co-morbidity was observed with CNS malformations. The diagnostic sensitivity was significantly higher in postnatal ultrasound screening (79.6 vs. 18.2 % prenatally), while the specificity was above 99 % at all time points. CONCLUSION: This study demonstrates a high prevalence of CAKUT and demonstrates the importance of combined prenatal and postnatal ultrasound examinations for early CAKUT diagnosis.

[Minilaparoscopy below the left costal border with radially expanding STEP-Trocar-System in patients with previous pelvic surgery--results of a pilot study]. / Minilaparoskopie vom linken Rippenbogenrand mit dem dilatierbaren STEP-Trokar-System bei voroperierten Patientinnen--Ergebnisse einer Pilotstudie.

As a part of a prospective study of 20 patients with previous pelvic surgery, the efficacy of using a 2/3 mm dilatable STEP device (InnerDyne, Inc., Sunnyvale, USA) for the first insertion in the area below the left costal border was tested, using 2 or 3.3 mm minilaparoscopes (Storz). Despite the high incidence of periumbilical omental and bowel adhesions (55%), no complications were observed in any of the 20 patients with previous pelvic surgery. Herewith could be confirmed that the use of a minilaparoscope in the area below the left costal border represents in high risk patients a safe and minimally invasive method for preventing or reducing the number of trocar-related injuries during first trocar insertion. In combination with the use of 2/3 mm disposable STEP-trocars if clinically required an atraumatic dilation and safe insertion of reusable 5 mm, 10 mm or 12 mm trocars is enabled.