BACKGROUND:Chronic kidney disease (CKD) is associated with increased mortality in patients with heart failure (HF). However, its association with hospitalization in HF patients has not been well studied. METHODS: Of 7788 patients in the Digitalis Investigation Group trial, 3527 had CKD, defined by an estimated glomerular filtration rate (GFR) <60 ml/min/1.73 m(2) body surface area (BSA). Propensity scores for CKD were calculated using a multivariable logistic regression model and used to match 2399 pairs of patients with and without CKD. Matched Cox regression analyses were used to estimate association of CKD with outcomes. RESULTS:All-cause hospitalization occurred in 1636 (rate, 4233/10,000 person-years) and 1587 (rate, 3733/10,000 person-years) patients respectively, with and without CKD (matched hazard ratio [HR] for CKD, 1.18, 95% confidence interval [CI], 1.08-1.29; P < 0.0001). Matched HR for cardiovascular and HF hospitalization were respectively 1.17 (95% CI, 1.06-1.28, P = 0.002) and 1.28 (95% CI, 1.13-1.45, P < 0.0001). Compared to GFR >or=60 ml/min/1.73 m(2) BSA, HR for all-cause hospitalization for GFR 45-59 and <45 ml/min/1.73 m(2) BSA were respectively 1.04 (95% CI, 0.94-1.16; P = 0.422) and 1.58 (95% CI, 1.34-1.87; P < 0.0001). Similarly, HR for all-cause death for GFR 45-59 and <45 ml/min/1.73 m(2) BSA were respectively 1.03 (95% CI, 0.90-1.18; P = 0.651) and 1.70 (95% CI, 1.40-2.07; P < 0.0001). Matched HR for death due to cardiovascular causes and progressive HF were respectively 1.24 (95% CI, 1.09-1.40; P = 0.001) and 1.42 (95% CI, 1.16-1.72; P = 0.001). CONCLUSION:CKD was associated with increased mortality and hospitalization in ambulatory patients with chronic HF, which increased progressively with worsening kidney function.
RCT Entities:
BACKGROUND:Chronic kidney disease (CKD) is associated with increased mortality in patients with heart failure (HF). However, its association with hospitalization in HF patients has not been well studied. METHODS: Of 7788 patients in the Digitalis Investigation Group trial, 3527 had CKD, defined by an estimated glomerular filtration rate (GFR) <60 ml/min/1.73 m(2) body surface area (BSA). Propensity scores for CKD were calculated using a multivariable logistic regression model and used to match 2399 pairs of patients with and without CKD. Matched Cox regression analyses were used to estimate association of CKD with outcomes. RESULTS: All-cause hospitalization occurred in 1636 (rate, 4233/10,000 person-years) and 1587 (rate, 3733/10,000 person-years) patients respectively, with and without CKD (matched hazard ratio [HR] for CKD, 1.18, 95% confidence interval [CI], 1.08-1.29; P < 0.0001). Matched HR for cardiovascular and HF hospitalization were respectively 1.17 (95% CI, 1.06-1.28, P = 0.002) and 1.28 (95% CI, 1.13-1.45, P < 0.0001). Compared to GFR >or=60 ml/min/1.73 m(2) BSA, HR for all-cause hospitalization for GFR 45-59 and <45 ml/min/1.73 m(2) BSA were respectively 1.04 (95% CI, 0.94-1.16; P = 0.422) and 1.58 (95% CI, 1.34-1.87; P < 0.0001). Similarly, HR for all-cause death for GFR 45-59 and <45 ml/min/1.73 m(2) BSA were respectively 1.03 (95% CI, 0.90-1.18; P = 0.651) and 1.70 (95% CI, 1.40-2.07; P < 0.0001). Matched HR for death due to cardiovascular causes and progressive HF were respectively 1.24 (95% CI, 1.09-1.40; P = 0.001) and 1.42 (95% CI, 1.16-1.72; P = 0.001). CONCLUSION: CKD was associated with increased mortality and hospitalization in ambulatory patients with chronic HF, which increased progressively with worsening kidney function.
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