Associates of mortality and hospitalization in hemodialysis: potentially actionable laboratory variables and vascular access.

Lacson E, Wang W, Hakim RM, Teng M, Lazarus JM
Am J Kidney Dis. 2009 53 (1): 79-90

PMID: 18930570 · DOI:10.1053/j.ajkd.2008.07.031

BACKGROUND - To determine the most significant potentially actionable clinical variables associated with mortality and hospitalization risk in hemodialysis (HD) patients.

STUDY DESIGN - Cohort study.

SETTING & PARTICIPANTS - Adult maintenance HD patients in the Fresenius Medical Care, North America database as of January 1, 2004, with baseline information from October 1, 2003, to December 31, 2003, comprising approximately 26% of the US HD population.

PREDICTORS - Case-mix (age, sex, race, diabetes, vintage, and body surface area), vascular access, and laboratory (albumin, equilibrated Kt/V, hemoglobin, calcium, phosphorus, creatinine, bicarbonate, biointact parathyroid hormone, transferrin saturation, and white blood cell count) variables.

OUTCOMES - 1-year mortality and hospitalization risk from January 1 to December 31, 2004.

MEASUREMENTS - Cox proportional hazards models for death and hospitalization.

RESULTS - The cohort (N = 78,420) had a mean age of 61.4 +/- 15.0 years, 47% were women, 49% were white, 41% were black race (10% defined as "other"), and 52% had diabetes. The top 5 actionable variables were the same for mortality and hospitalization. Final case-mix plus laboratory-adjusted hazard ratios for these top 5 actionable variables indicate 177% increased risk of death and 67% increased risk of hospitalization per 1-g/dL decrease in albumin level, 39% and 45% greater risk with catheters compared with fistulas, 18% and 9% greater risk per 1-mg/dL greater phosphorus level, 11% and 9% lower risk per 1-g/dL greater hemoglobin level, and 5% and 2% greater risk per 0.1-unit decrease in equilibrated Kt/V, respectively (all P < 0.0001).

LIMITATIONS - Observational cross-sectional study with limited comorbidity adjustment (for diabetes).

CONCLUSION - The same variables are associated with both mortality and hospitalization in HD patients. The top 5 potentially actionable variables are readily identifiable, with albumin level and catheter use the most prominent, and all 5 are appropriate targets for improvement.

MeSH Terms (24)

Aged Albuminuria Calcium Catheters, Indwelling Cohort Studies Creatinine Cross-Sectional Studies Female Hemoglobins Hospitalization Humans Kidney Failure, Chronic Leukocyte Count Male Middle Aged Multivariate Analysis North America Outcome Assessment (Health Care) Parathyroid Hormone Phosphorus Proportional Hazards Models Renal Dialysis Risk Factors Transferrin

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