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The transperitoneal approach is used systematically for an arterial or a venous splenorenal anastomosis. However, this approach is associated with high morbidity and mortality rates. Because of our anatomical and surgical findings we have used the retroperitoneal approach to the splenic hilus by means of the lumbar region. The first splenorenal arterial anastomosis with this approach was done in 1972. The approach has proved to be less aggressive since it avoids the danger of damaging the pancreas, it is a more direct approach to the splenic vessels and it provides better exposure and facilitates the anastomosis. In addition, the loss or infection of ascitic fluid in cirrhotic patients is avoided with this approach, as well as intraoperative hemorrhaging caused by the great surplus circulation. There has been neither mortality nor complications in the 13 cases of arterial and venous splenorenal anastomoses that we have done with this method.

In view of the current controversy about the relative merits of subtotal versus total parathyroidectomy plus autograft for the treatment of parathyroid hyperplasia, we reviewed the results of subtotal parathyroidectomy in 6 patients with hyperparathyroidism after successful renal transplantation. All had normal renal function and hypercalcemia (mean 11.4 mg/100 ml). The time elapsed between renal transplantation and parathyroidectomy ranged from 3 months to 10 years (mean 42 months). The indications for subtotal parathyroidectomy were: severe acute hypercalcemia after transplantation (1 case), persistent asymptomatic hypercalcemia (2 cases), allograft iithiasis (2 cases), and bone disease (1 case). Subtotal parathyroidectomy was performed, aiming to leave about 30-50 mg of parathyroid tissue, and included a routine transcervical thymectomy. The weight of resected tissue ranged between 0.6 and 2.4 g per patient (mean 1.58 g). Immediate control of hypercalcemia was achieved in all cases. No patient needed replacement therapy with calcium and/or vitamin D after the operation. The 6 patients were followed from 8 months to 4.5 years (mean 34 months) and all had normal calcium, phosphate, and alkaline phosphatase serum values at the time of their last visit. A reappraisal of the surgical indications for hypercalcemia after renal transplantation is needed because severe longterm complications (allograft lithiasis) may develop in patients with minimal hypercalcemia. Subtotal parathyroidectomy is a good operation for treating hyperparathyroidism in patients with functioning renal allografts.

The mass transfer area coefficient (MTC) is the best parameter for solute transport evaluation in continuous ambulatory peritoneal dialysis (CAPD) patients. We compared three simplified MTC methods (calculated according Garred, Krediet, or Lindholm) and the peritoneal equilibration test (PET) (Twardowskl) to complex MTC (MTCX) (Randerson and farrell) for urea and creatinine, by means of 29 tests performed In 24 stable CAPD patients. There were no significant differences (paired t-test) between MTCX and each of the simplified MTC, except for creatinine MTC calculated by Krediet's method, which was significantly different (MTCX: 9.36.:1:.4.32, K-MTC: 10.48.:1:.4.55, p<0.05). Likewise, there was an acceptable correlation between complex MTC and each of the simplified methods including the PET. However, a more detailed study of the MTC's categorizations shows poor agreement with complex MTC categorization. Better results are obtained by PET categorization, which reaches good likelihood ratios either for positive or negative events. We conclude that simplified MTC or the dialysatelplasma ratio at 240 minutes for urea and creatinine has an acceptable correlation with complex MTC and can be useful in clinical practice. There is poor agreement between solute transport categorizations of simplified MTC and complex MTC. There Is a better coincidence between the PET ( DIP at 240 minutes) and complex MTC categorizations.