Effect of the timing of dialysis initiation on left ventricular hypertrophy and inflammation in pediatric patients

Background The optimal time for dialysis initiation in adults and children with chronic kidney disease remains unclear. The aim of this study was to evaluate the impact of dialysis timing on different outcome parameters, in particular left ventricular (LV) morphology and inflammation, in pediatric patients receiving peritoneal dialysis and hemodialysis. Methods The medical records of pediatric dialysis patients who were followed-up in nine pediatric nephrology centers in Turkey between 2008 and 2013 were retrospectively reviewed. In addition to demographic data, we retrieved anthropometric measurements, data on dialysis treatment modalities, routine biochemical parameters, complete blood count, serum ferritin, parathormone, C-reactive protein (CRP), and albumin levels, as well as echocardiographic data and hospitalization records. The patients were divided into two groups based on their estimated glomerular filtration rate (eGFR) levels at dialysis initiation, namely, an early-start group, characterized by an eGFR of > 10 ml/min/1.73 m(2), and a late-start group, with an eGFR of < 7 ml/min/1.73 m(2). The collected data were compared between these groups. Results A total of 245 pediatric dialysis patients (mean age +/- standard deviation 12.3 +/- 5.1 years, range 0.5-21 years) were enrolled in this study. Echocardiographic data were available for 137 patients, and the mean LV mass index (LVMI) was 58 +/- 31 (range 21-215) g/m(2.7). The LVMI was 75 +/- 30 g/ m(2.7)(n = 81) and 34 +/- 6 g/m(2.7)(n = 56) in patients with or without LV hypertrophy (LVH) (p < 0.001). Early-start (eGFR > 10 ml/min/1.73 m(2)) versus late-start dialysis (eGFR < 7 ml/ min/1.73 m(2)) groups did not significantly differ in LVMI and LVH status (p > 0.05) nor in number of hospitalizations. Serum albumin levels were significantly higher in the earlydialysis group compared with the late-dialysis group (3.3 +/- 0.7 vs. 3.1 +/- 0.7 g/dl, respectively; p < 0.05). The early-start group had relatively higher time-averaged albumin levels (3.2 +/- 0.5 vs. 3.1 +/- 0.5 g/dl; p = > 0.05) and relatively lower CRP levels (3.64 +/- 2.00 vs. 4.37 +/- 3.28 mg/L, p > 0.05) than the late-start group, but these differences did not reach statistical significance. Conclusion Although early dialysis initiation did not have a significant effect on important clinical outcome parameters, including LVH, inflammatory state, and hospitalization, in our pediatric dialysis patients, this area of study deserves further attention.