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  • Title: Complete renal tubular acidosis late after kidney transplantation.
    Author: Schwarz C, Benesch T, Kodras K, Oberbauer R, Haas M.
    Journal: Nephrol Dial Transplant; 2006 Sep; 21(9):2615-20. PubMed ID: 16644772.
    Abstract:
    BACKGROUND: Neither the prevalence nor the associated risk factors of late post-transplant renal tubular acidosis (RTA) are known. METHODS: We conducted a cross-sectional study with 576 patients for more than 12 months after kidney transplantation, and a glomerular filtration rate (GFR) >40 ml/min. RTA was diagnosed by measurement of the urine anionic gap, urine pH and plasma potassium during acidosis, and fractional bicarbonate excretion after bicarbonate loading. Uni- and multi-variable analysis were used to isolate factors associated with post-transplant RTA, and with the different RTA subtypes. RESULTS: All patients (n = 76) had distal post-transplant RTA. A significant association with the presence of RTA was found for the intake of tacrolimus or renin-angiotensin-aldosterone blockers, the Parathyroid hormone level and the GFR. Type Ia (classic, distal), type Ib (hyperkalaemic, voltage-dependent), rate-limited and type IV RTA were present in 37, 14, 21 and 28% of the patients. Acute transplant rejection was the only significant different parameter between the RTA subtypes and more often present in patients with type Ia or Ib RTA. CONCLUSIONS: We conclude that a significant fraction of stable long-term renal transplant recipients with adequate graft function develop post-transplant RTA, with a preponderance for type Ia and type IV, and absence of type II. In addition, acute transplant rejection seems to have an influence on the subtype of RTA present post-transplantation.
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