Clinical Relevance of Absolute BK Polyoma Viral Load Kinetics in Patients With Biopsy Proven BK Polyomavirus Associated Nephropathy.

Introduction: The absolute BK viral load is an important diagnostic surrogate for BK polyomavirus associated nephropathy (PyVAN) after renal transplant (KTX) and serial assessment of BK viremia is recommended. However, there is no data indicating which particular viral load change, i.e., absolute vs. relative viral load changes (copies/ml; percentage of the preceding viremia) is associated with worse renal graft outcomes. Materials and Methods: In this retrospective study of 91 biopsy proven PyVAN, we analyzed the interplay of exposure time, absolute and relative viral load kinetics, baseline risk, and treatment strategies as risk factors for graft loss after 2 years using a multivariable Poisson-model. Results: We compared two major treatment strategies: standardized immunosuppression (IS) reduction (n = 53) and leflunomide (n = 30). The median viral load at the index biopsy was 2.15E+04 copies/ml (interquartile range [IQR] 1.70E+03-1.77E+05) and median peak viremia was 3.6E+04 copies/ml (IQR 2.7E+03-3.3E+05). Treatment strategies and IS-levels were not related to graft loss. After correction for baseline viral load and estimated glomerular filtration rate (eGFR), absolute viral load decrease/unit remained an independent risk factor for graft loss [incidence rate ratios [IRR] = 0.77, (95% CI 0.61-0.96), p = 0.02]. Conclusion: This study provides evidence for the prognostic importance of absolute BK viremia kinetics as a dynamic parameter indicating short-term graft survival independently of other established risk factors.

Clinical application of interventional renal sympathetic denervation: recommendations of the Austrian Society of Hypertension 2012.

Increased activity of the sympathetic nervous system plays a major role in the pathophysiology of primary arterial hypertension. Interventional renal sympathetic denervation (RSD) is a novel percutaneous treatment, decreasing sympathetic activity and consecutively blood pressure by ablating sympathetic nervous fibers located in the adventitia of the renal arteries. The procedure has been tested in several clinical trials in patients with resistant hypertension (defined as systolic office blood pressure > 160 mmHg-in diabetic patients > 150 mmHg-treated with ³ 3 antihypertensive drugs) and caused a meaningful blood pressure reduction, lasting for at least 3 years. So far, no major adverse events have been identified; however, data on the long-term consequences are lacking. The present position paper of the Austrian Society of Hypertension is aiming to assist in choosing possible indications for RSD in clinical routine, based on the available evidence in 2012.

[Hypertension and the kidney]. / Hypertonie und Niere.

Hypertension and proteinuria are common risk factors for cardiovascular morbidity and mortality, as well as for the progression of renal disease. Renal functional impairment represents an independent cardiovascular risk factor by itself. Strict antihypertensive therapy and measures to maximally reduce proteinuria can substantially improve the prognosis of renal patients. This review summarizes current evidence for the role of hypertension and proteinuria with regard to renal and cardiovascular outcomes and for the importance of intensive antihypertensive and anti-proteinuric measures.