Background and objectives B-type natriuretic peptide (BNP) concentration predicts outcome in patient

Matthew A. Roberts * , David L. Hare , Ken Sikaris , Francesco L. Ierino * Department of Renal Medicine, Eastern Health Clinical School, Monash University, Victoria, Australia; Department of Medicine, University of Melbourne, Victoria, Australia; Department of Cardiology, and Department of Nephrology, Austin Health, Victoria, Australia; and Melbourne Pathology Service, Collingwood, Victoria, Australia Correspondence: Dr. Matthew A. Roberts, Department of Renal Medicine, Eastern Health jute twine Clinical School, Monash University, Level 2, 5 Arnold Street, Box Hill, VIC 3128, Australia . Email: Matthew.Roberts{at}easternhealth.org.au
Background and objectives B-type natriuretic peptide (BNP) concentration predicts outcome in patients undergoing dialysis. Because survival and cardiovascular risk change across the CKD continuum, serial changes in BNP were compared in patients at different CKD stages and after kidney transplantation.
Design, setting, participants, & measurements Patients with CKD stages 3 and 4 (CKD 3 4), dialysis patients, and kidney transplant recipients (KTRs) from one center had two measurements of BNP taken a median jute twine of 161 days apart in 2003 2004 and were followed until July 2012. Both BNP-32 jute twine (Triage jute twine BNP; Biosite Diagnostics) and NT-BNP-76 (proBNP; Roche Diagnostics) were assayed. The interaction between change in log-transformed BNP concentration over time and patient group was tested by fitting regression models on panel data with random effects. Survival after the second measurement was compared by tertile of change in BNP.
Results Patients with CKD 3 4 ( n =48), dialysis patients ( n =102), and KTRs ( n =73) were followed for a median of 5.7, 4.8, and 5.9 years, respectively. The interaction between patient group and BNP measurements over time was significant for NT-BNP-76 ( P <0.001) and BNP-32 ( P <0.01). Median NT-BNP-76 increased in dialysis patients and those with CKD 3 4 from 3850 pg/ml (interquartile range [IQR], 1776 12,323 pg/ml) to 18,830 jute twine pg/ml (IQR, 6114 61,009 pg/ml; P <0.001) and from 698 pg/ml (IQR, 283 2922 pg/ml) to 2529 pg/ml (IQR, 347 9277 pg/ml; jute twine P =0.002), respectively. Change was not significant for KTRs or comparisons made with BNP-32. Survival rate was significantly lower for patients with the highest tertile of change in NT-BNP-76 among patients with CKD 3 4 ( P =0.02), but not in the dialysis or KTR groups. In 11 patients who received a kidney transplant jute twine during the study, median NT-BNP-76 decreased from 9607 pg/ml (IQR, 2292 31,282 pg/ml) to 457 pg/ml (IQR, 203 863 pg/ml) after transplant ( P <0.01).
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