[Epidemiology of urologic pediatric emergencies in our hospital, 1990]. / Epidemiologiá de las urgencias urológicas pediátricas en nuestro hospital, 1990.

The article's objective is to study the epidemiological patterns which define the paediatric urological emergencies within the area of influence of our hospital. To this end, 187 protocols of the paediatric emergencies attended by the urologist in 1990 were retrospectively reviewed. The most frequently observed pathologies were balanitis-phimosis, acute scrotum and genito-urinary injuries. A clear relationship of the type of disease to the patient's age and treatment, as well as some time-related variations were observed. About 40% of all cases could had been treated at a non-emergency outpatient clinic.

[Parathormone, cyclic AMP, 1,25 dihydroxyvitamin D and osteocalcin in hypercalciuric renal lithiasis]. / Parathormona, AMP cíclico, 1,25 dihidroxivitamina D y osteocalcina en la litiasis renal hipercalciúrica (LRH).

A study was undertaken in 46 subjects; 21 patients diagnosed as having HRL and 25 volunteers patients. Biochemical and hormonal analyses were performed in the study population, including determination of Ca, P, Mg, Cr in blood and urine, phosphate tubular resorption (PTR), maximum tubular phosphate resorption (MTPR), fasting calcium secretion (FCS), alkaline phosphatase (AP), hydroxyprolinuria (HPR), osteocalcin (BGP), parathormone (PTH), cAMP, and 1-25(OH)2D. The stone formers showed lower calcemia values (p less than or equal to 0.005d), higher phosphaturia, and magnesiuria (p less than or equal to 0.0005), higher FCS (P less than or equal to 0.005) and higher values for PTH (p less than or equal to 0.01) and cAMP (p less than or equal to 0.0025). No significant differences were observed for the other parameters evaluated. Classification of the patient group into 2 subgroups (renal SbR and absorptive SbA) according to FCS values greater or lower that 0.16 mg/dl, the SbR patient group revealed a higher PTH and 1-25(OH)2D values (p less than or equal to 0.05). There appears to be no increase of bone resorption since AP, HPR, and BGP values in our patients fell within normal ranges. The 1-25(OH)2D levels were also normal and, with respect to the control group, were only elevated for the SbR patient group, whose PTH levels were also observed to be elevated. These increments appear to be related and may result in intermediate forms between renal and absorptive hypercalciuria.

Experimental oxalosis in rats: an electron microscopic study.

The ultrastructural change in rat kidneys was analyzed after intraperitoneal injection of oxalic acid. This study demonstrates fundamental alterations in the epithelial cells of the proximal convoluted tubules (PCT). At 8 h (group IV), cytoplasmic prolongations (CP) begin to be observed, which fill the lumens of PCT at 20 h (group VII) and 24 h (group VIII). Unusual mechanism of cytoplasmic secretion is suggested to this fact. Calcium salts were found on CP and in group VIII. At 16 h (group IV), intracitoplasmic membranous structures (MS) appear, which can emigrate across the microvilli into the lumens of PCT. At 24 h (group VIII), MS are also shown in basal zone and in basement membrane. We considered that CP, which can fragment, and MS are the ultrastructural substratum of the matrix of the calculis, corresponding probably to the substance A.