Abstract:
BACKGROUND:Although hemodialysis (HD) adequacy, single-pool Kt/Vurea (spKt/V), is inversely correlated with body size, each is known to affect patient survival in the same direction. Therefore, we sought to examine the relationship between HD adequacy and mortality according to body mass index (BMI) in HD patients and explore a combination effect of BMI and HD adequacy on mortality risk. METHODS:We retrospectively reviewed patient data from the Korean Society of Nephrology registry, a nationwide database of medical records of HD patients, from January 2001 to June 2017. We included patients ≥18 years old who were receiving maintenance HD. Patients were categorized into three groups according to baseline BMI (< 20 (low), 20 to < 23 (normal), and ≥ 23 (high) kg/m2). Baseline spKt/V was divided into six categories. RESULTS:Among 18,242 patients on HD, the median follow-up duration was 5.2 (IQR, 1.9-8.9) years. Cox regression analysis showed that, compared to the reference (spKt/V 1.2-1.4), lower and higher baseline spKt/V were associated with greater and lower risks for all-cause mortality, respectively. However, among patients with high BMI (n = 5588), the association between higher spKt/V and lower all-cause mortality was attenuated in all adjusted models (Pinteraction < 0.001). Compared to patients with normal BMI and spKt/V within the target range (1.2-1.4), those with low BMI had a higher risk for all-cause mortality at all spKt/V levels. However, the gap in mortality risk became narrower for higher values of spKt/V. Compared to patients with normal BMI and spKt/V in the target range, those with high BMI and spKt/V < 1.2 were not at increased risk for mortality despite low dialysis adequacy. CONCLUSIONS:The association between spKt/V and mortality in HD patients may be modified by BMI.
journal_name
BMC Nephroljournal_title
BMC nephrologyauthors
Hong WP,Lee YJdoi
10.1186/s12882-019-1570-0subject
Has Abstractpub_date
2019-10-22 00:00:00pages
382issue
1issn
1471-2369pii
10.1186/s12882-019-1570-0journal_volume
20pub_type
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