ASSOCIATION OF RESIDUAL KIDNEY CLEARANCE WITH MALNUTRITION AND INFLAMMATION IN PERITONEAL DIALYSIS: A CROSS SECTIONAL STUDY

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ASSOCIATION OF RESIDUAL KIDNEY CLEARANCE WITH MALNUTRITION AND INFLAMMATION IN PERITONEAL DIALYSIS: A CROSS SECTIONAL STUDY

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Co-author 1

Aphichat Chatkrailert tengaphi@gmail.com Thammasat University Division of Nephrology, Internal Medicine Department Pathum Thani Thailand *

Co-author 2

Wankawee Jeerangsapasuk wankaweej@gmail.com Thammasat University Division of Nephrology, Internal Medicine Department Pathum Thani Thailand -

Co-author 3

Chayaporn Wichitkul Chayapornwichitkul@gmail.com Thammasat University Division of Nephrology, Internal Medicine Department Pathum Thani Thailand -

Co-author 4

Thanarak Boonkerd thanajazz18@gmail.com Thammasat University Hospital Renal Unit Pathum Thani Thailand -

Co-author 5

Siriporn Wisettorn wisettornsiri@gmail.com Thammasat University Hospital Renal Unit Pathum Thani Thailand -

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Introduction

Malnutrition and systemic inflammation are common and interrelated complications in patients undergoing peritoneal dialysis (PD), contributing to poor clinical outcomes. Residual kidney clearance (Kr) may play a protective role in this context, while erythropoietin resistance index (ERI) reflects anemia management challenges influenced by inflammation. This study aimed to investigate the associations of Kr and ERI with nutritional and inflammatory markers in PD patients.

Methods

We conducted a cross-sectional study of 47 stable adult PD patients. Nutritional and inflammatory indicators, including malnutrition-inflammation score (MIS), serum albumin, and interleukin-6 (IL-6), were assessed alongside Kr and ERI. Ordinal regression was used to evaluate associations, and Spearman correlation with bootstrapped 95% confidence intervals determined relationships among clinical variables.

Results

The mean age was 62.2 ± 15.5 years; 53.2% were male. The mean MIS was 5.7 ± 2.5, serum albumin 3.29 ± 0.5 g/dL. Kr was significantly inversely associated with MIS (β = –0.585, p = 0.040) and positively associated with serum albumin (β = 0.152, p = 0.018). IL-6 was positively associated with MIS (β = 0.684, p = 0.037). Spearman analysis confirmed significant correlations between Kr and both MIS (r = –0.358, p = 0.008) and albumin (r = 0.343, p = 0.012), and between IL-6 and MIS (r = 0.390, p = 0.004). ERI showed no significant correlations with MIS, albumin, IL-6, or Kr.

Conclusion

Kr was significantly associated with better nutritional status and lower inflammatory burden in patients undergoing peritoneal dialysis, while ERI appears unrelated to these markers. Preservation of Kr and use of IL-6 and MIS as assessment tools may support individualized nutritional and inflammation management in PD care.

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