title: Chronic kidney disease associated mortality in diastolic versus systolic heart failure: a propensity matched study.
abstract: Chronic kidney disease (CKD) is common and is associated with increased mortality in heart failure (HF). However, it is unknown whether the effect of CKD on mortality varies by left ventricular ejection fraction (LVEF). We evaluated the effect of CKD on mortality in patients with systolic (LVEF <or=45%) and diastolic (LVEF >45%) HF. Of the 7,788 patients in the Digitalis Investigation Group trial, 3,527 (45%) had CKD (estimated glomerular filtration rate <60 ml/min/1.73 m2). We calculated the propensity score for CKD for each patient, using a multivariate logistic regression model (c statistic 0.76, postmatch absolute standardized differences <5% for all 32 co-variates). We matched 2,399 pairs of patients with and without CKD with similar propensity scores. There were 757 (rate 1,049/10,000 person-years) and 882 (rate 1,282/10,000 person-years) deaths, respectively, in patients without and with CKD (hazard ratio 1.22, 95% confidence interval 1.09 to 1.36, p <0.0001). CKD-associated mortality was higher in those with diastolic HF (371 extra deaths/10,000 person-years, hazard ratio 1.71, 95% confidence interval 1.21 to 2.41, p = 0.002) than in systolic HF (214 extra deaths/10,000 person-years, hazard ratio 1.19, 95% confidence interval 1.07 to 1.32, p = 0.001), which was significant (adjusted p for interaction = 0.034). A graded association was found between CKD-related deaths and LVEF. The hazard ratios for CKD-associated mortality for the LVEF subgroups of <35%, 35% to 55%, and >55% were 1.15 (95% confidence interval 1.02 to 1.29), 1.35 (95% confidence interval 1.11 to 1.64), and 2.33 (95% confidence interval 1.34 to 4.06). In conclusion, CKD-associated mortality was higher in those with diastolic than systolic HF. Patients with diastolic HF should be evaluated for CKD, and the role of inhibitors of the renin-angiotensin system in these patients needs to be investigated.
authors.affiliation: University of Alabama at Birmingham, Birmingham, Alabama, USA. aahmed@uab.edu
authors.forename: Ali
authors.initials: A
authors.lastname: Ahmed
authors.forename: Michael W
authors.initials: MW
authors.lastname: Rich
authors.forename: Paul W
authors.initials: PW
authors.lastname: Sanders
authors.forename: Gilbert J
authors.initials: GJ
authors.lastname: Perry
authors.forename: George L
authors.initials: GL
authors.lastname: Bakris
authors.forename: Michael R
authors.initials: MR
authors.lastname: Zile
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Love
authors.forename: Inmaculada B
authors.initials: IB
authors.lastname: Aban
authors.forename: Michael G
authors.initials: MG
authors.lastname: Shlipak
mesh_terms: D000368:Aged; D002316:Cardiotonic Agents / Q000627:therapeutic use; D016001:Confidence Intervals; D003971:Diastole; D004071:Digitalis Glycosides / Q000627:therapeutic use; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D005919:Glomerular Filtration Rate; D006333:Heart Failure / Q000150:complications / Q000188:drug therapy / Q000401:mortality*; D006801:Humans; D007676:Kidney Failure, Chronic / Q000150:complications* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction / Q000502:physiology*; D011379:Prognosis; D016016:Proportional Hazards Models; D012189:Retrospective Studies; D012307:Risk Factors; D015996:Survival Rate / Q000639:trends; D013599:Systole
chemical_list: D002316:Cardiotonic Agents; D004071:Digitalis Glycosides