[Upper urinary tract hypertrophy of the solitary kidney]

17 dogs were examined 1 and 3 months, 1-1.5 years after unilateral nephrectomy. It was found that compensatory hypertrophy develops not only in the parenchyma of the remaining kidney but in the upper urinary tracts as well. 1 month after the nephrectomy ureteral activity for urine evacuation enhanced as compared to its preoperative activity. 3 months and 1-1.5 years after the nephrectomy ureteral performance remained elevated. High performance was supported due to increased amplitude of the contractions and their prolongation. Frequency of the contractions reduced. Basal and peristaltic pressure in the ureter, as a rule, rose. Diuretic lazix load 3 months after nephrectomy and more led to higher elevation of the intraureteral pressure. Ureteral wall lock in contraction promoting active urinary transport was observed whereas this locking mechanism before nephrectomy was decompensated even in lower intraureteral pressure. Ureteral hypertrophy was followed by negative effects such as defective generation and conduction of excitation through the ureter, higher incidence of endogenous infection in the urinary tracts.