The Factors Influencing Peritoneal Membrane Transport Characteristics Within 4 Weeks in CAPD Patients / 대한신장학회잡지

BACKGROUND: To get stability and reproducibility of peritoneal membrane transport characteristics of peritoneal dialysis patients, peritoneal equilibration test (PET) is usually recommended at least 1 month after initiation of peritoneal dialysis. But there has been controversy about the exact mechanism. The aim of this study was to compare peritoneal membrane transport characteristics at 2nd and 4th week after initiation of peritoneal dialysis and analyze associated factors. METHODS: From May 2001 to March 2002, 60 new CAPD patients in our hospital were enrolled (male: 31, mean age: 52.6 years old, DM: 23). PET, body weight, body surface area (BSA), blood hemoglobin, serum albumin, hs-CRP(high sensitivity C reactive protein), 24 hours dialysate volume and 24 hours dialysate albumin amount, weekly Kt/Vurea, weekly CCr, residual renal function (RRF) were checked at 2nd and 4th week. Paired t-test, independent t-test, Pearson correlation and multiple regression analysis (GEE by STATA, version 7.0) were used. RESULTS: We can summarize the RESULTS: D/P4Cr and hemoglobin level were significantly increased with time (0.66+/-0.13 g/dL vs. 0.69+/-0.11 g/dL and 9.38+/-1.12 g/dL vs. 9.82+/-1.09 g/dL, p<0.05, respectively) and body weight was significantly decreased with time (63.1+/-11.7 kg vs. 62.4+/-11.2 kg, p<0.05). Factors influencing D/P4Cr change were 24 hours dialysate volume, serum albumin and 24 hours dialysate albumin amount (Beta coefficients: -0.044/L, -0.062/g/dL and 0.028/g/day, p<0.01, respectively). Factors influencing serum albumin (g/dL) were D/ P4Cr, 24 hours dialysate volume and hemoglobin level (Beta coefficients: -0.129/0.1, -0.117/L and 0.133/g/ dL, p<0.01, respectively). There was positive correlation between delta changes of D/P4Cr and delta changes of hs CRP (r=0.297, p=0.02) CONCLUSION: The change of D/P4Cr within 1 month was reciprocally correlated with the change of serum albumin (negatively) and hs CRP (positively). The change of serum albumin, 24 hours dialysate volume and 24 hours albumin loss via dialysate influenced the change of D/P4Cr within 1 month after initiation of peritoneal dialysis.

Factors Affecting Serum Albumin Level in Continuous Ambulatory Peritoneal Dialysis Patients / 대한내과학회지

OBJECTIVES: Protein-calorie malnutrition is a common problem in patients undergoing continuous ambulatory peritoneal dialysis (CAPD). Serum albumin(SA) concentration has been used as a marker for assessing nutritional status. Hypoalbuminemia has been linked to an increased risk of morbidity and mortality and more numerous, prolonged hospitalization for peritoneal dialysis patients. The aim of this study was to determine factors affecting SA value in CAPD patients. METHODS: We performed a cross-sectional study which included patients' demographics, anthropometric data, biochemical parameters, urea kinetic data and comorbidity in 106 stable CAPD patients. RESULTS: 1) There were 50 men and 56 women with a mean CAPD duration of 43 months and mean age of 49 years. The mean concentration of SA was 3.9+/-0.5 (range 2.5-5.3) g/dl and weekly Kt/Vurea 2.0+/-0.4 (range 1.32-3.79) 2) Twenty-one patients(20%) were classified as group I(SA<3.5g/dl)and the remaining patients(80%) as group II(SA 3.5g/dl) 3) Group I patients were significantly older(55+/-11 vs 47+/-11 years, p<0.05) and had significantly higher comorbidity score(1.5+/-0.8 vs 0.7+/-0.9, p<0.05), C-reactive protein (4.5+/-0.9 vs 0.5+/-0.1 mg/dl, p<0.05), 24-hr dialysate-toplasma creatinine(D/PCr) ratio(0.84+/-0.1 vs 0.76+/-0.1, p<0.05), 24-hr dialysate protein (7167+/-2031 vs 5471+/-1515 mg, p<0.05) and had significantly lower residual renal function(RRF)(0.2+/-0.3 vs 0.7+/-1.2 ml/min, p<0.05), BUN(48+/-14.8 vs 55.6+/-14.9 mg/dl, p<0.05), serum creatinine(10.4+/-2.8 vs 12.6+/-3.5 mg/dl, p<0.05), IGF-1(186+/-99 vs 260+/-131 ng/ml, p<0.05), serum phosphorus(4.1+/-1.2 vs 5.0+/-1.3 mg /dl, p<0.05) than group II.4) SA showed positive correlation with anion gap (r=0.43, p value=0.001), transferrin(r=0.41, p value= 0.001) phosphorus(r=0.31, p value=0.001) and negative correlation with 24-hr dialysate protein loss(r=-0.51, p value=0.001), 24-hr D/PCr ratio(r=-0.49, p value=0.001), comorbidity score(r=-0.36, p vluue=0.001). NPCR(r=0.22, p value=0.023), IGF-1(r=0.30, p value=0.002), BUN(r=0.23, p value=0.016) weakly correlated with SA.5) By stepwise multiple logistic regression analysis, age, CRP, 24-hr D/PCr ratio and RRF independently influenced SA level. CONCLUSION: SA level seems to be affected by non-nutritional factors such as age, peritoneal membrane transport characteristics, residual renal function and presence of acute phase protein response manifested by CRP elevation, in addition to nutritional factors.