[Effects of pressure and flow rate of irrigation liquid on hydrodynamics of the upper urinary tract in contact ureterolithotripsy].

We studied the influence of pressure and rate of irrigative liquid flow on hydrodynamics of the upper urinary tracts in contact pneumatic lithotripsy (Litoclast lithotriptor) in 68 patients with ureteroliths and nephrostomic drainage. To a nephrostome the device was attached on which the linear change of pressure inside the pelvis was measured at the moment of visualization of the stone, its destruction and final ureteroscopy. 45 patients had nephrostome with a pelvis curl. In this group of patients at the moment of stone destruction the pressure inside the pelvis and the speed of irrigative flow were increased. In patients with marked local inflammation on the place of stone location the pressure inside the pelvis was the highest. The effect of communicating vessels was seen. The stone was completely destroyed in 34 (75.5%) patients, in 9 (20%) patients the stone was destroyed partially. In 2 cases the stone migrated in the cavitary system of the kidney. A nephrostome-intubator was placed antegradely in 23 patients. The balloon-obturator was placed in the ureter above the stone through the nephrostome. The pressure inside the pelvis during contact lithotripsy was not increased. Full destruction of the stone was achieved in 26 patients (92.8%), migration of the stone in the cavitary system and partial destruction of the stone was observed in 2 (2.2%) patients.