[3D-technologies in planning and navigation for laparoscopic interventions in patients with renal and ureteric...

to evaluate the possibilities and efficiency of using 3D technologies for the laparoscopic interventions in patients with renal and ureteric stones.

A retrospective analysis of the results of surgical treatment of patients with renal and ureteric stones performed in the urology clinic of the I.M. Sechenov First Moscow State Medical University of Minzdrav of Russia for the period from January 2012 to December 2017 was carried out. During this period a total of 4958 interventions were done. Among them, 98 laparoscopic (1.97%) surgeries were performed, including nephron-sparing interventions (n=47; 48%), pyelolithotomy (n=15; 15.3%), ureterolithotomy (n=32; 32.65%) and partial nephrectomy (n=4; 4.05 %). The average patients age was 55.76+/-10.5 (29-80) years. There were 51 men (52%) and 47 women (48%). The mean stone density was 1237.6+/-354.6 HU (from 500 to 1913 HU). In 14 (22.9%) cases, nephrostomy tube or ureteric stent had been put before surgery. In addition, 40 (40.8%) patients previously underwent one surgical intervention on the kidneys and 17 patients with urinary stone disease (17.3%) underwent surgery more or equal 2 times. 88 (89.8%) patients had severe concomitant diseases and the most common pathology in 51 (52.0%) patients with urinary stone disease was arterial hypertension. In 11 (11.2%) cases, the interventions were performed in patients with abnormal kidneys, including horseshoe kidney (n=6; 6.1%), duplicated collecting system (n=3; 3.1%) and pelvic kidney (n=2; 2%). In addition to standard preoperative diagnostic methods in 22 cases (22.4%) the 3D-planning and multivariate virtual performing of intervention based on the multidetector computer tomography scan was done using Amira 3D-modeling program. Among these patients, virtual interventions were performed prior to all pyelolithotomy and partial nephrectomy. Intraoperative data of virtual constructions were used by surgeons as navigation. The interventions were performed by seven urologists at the clinic with various experience in laparoscopic surgery.

The mean duration of laparoscopic pyelolithotomy, laparoscopic partial nephrectomy, laparoscopic ureterolithotomy and laparoscopic nephrectomy was 183.2+/-69.6, 201.3+/-35.2 min, 97.6+/-43.7 and 165.4+/-92.3 min, respectively. The minimal blood loss was observed during laparoscopic ureterolithotomy (53.33+/-31.2 ml). During these interventions, in 8 cases (8.16%) a flexible endoscope was used for inspection and complete removal of stones. Intraoperative complications were noted in 6 patients (6.1%). There were 4 conversions to open surgery (4.1%). Postoperative surgical complications were observed in 1 (1%) patient, while non-surgical complications developed in 4 patients (4.1%). There was no mortality.

Laparoscopic access for the treatment of patients with urinary stone disease should be used for the treatment of patients with large, long-standing ureteral calculi and patients with kidney stones who have concomitant pathology of kidney or upper urinary tract (UPJ obstruction, kidney tumors) requiring surgical intervention. Laparoscopic access should be considered primarily for the planning of laparoscopic partial nephrectomy and laparoscopic nephrectomy in patients with urinary stone disease. The use of 3D computer-assisted technologies is advisable for patients with urinary stone disease and abnormal kidneys if laparoscopic pyelolithotomy, partial nephrectomy or ureterolithotomy is planned.