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Combination therapy improves survival after acute myocardial infarction in the elderly with chronic kidney disease

Michelle W Krause1, Mark Massing, Abhijit Kshirsagar

  • 1Division of Nephrology and Hypertension, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA. krausemichellew@uams.edu

Renal Failure
|December 17, 2004
PubMed

Insights

Patients with chronic kidney disease (CKD) benefit from cardioprotective therapy after heart attack, but are less likely to receive it. This study highlights potential disparities in treatment for CKD patients post-myocardial infarction.

Area of Science:

  • Cardiology
  • Nephrology
  • Pharmacotherapy

Background:

  • Individuals with chronic kidney disease (CKD) face elevated mortality risks following acute myocardial infarction (MI).
  • The utilization and impact of combination cardioprotective therapy in CKD patients post-MI remain under-investigated.
  • Understanding treatment patterns and survival outcomes is crucial for this high-risk population.

Purpose of the Study:

  • To assess the frequency of cardioprotective medication prescription in Medicare recipients with acute myocardial infarction (MI) and varying degrees of chronic kidney disease (CKD).
  • To determine if the use of cardioprotective therapy, including aspirin, beta-blockers, and ACE-inhibitors, affects survival rates in CKD patients post-MI.

Main Methods:

  • Retrospective cohort study involving 1,342 Medicare recipients diagnosed with acute myocardial infarction (MI).
  • Data collected via medical chart abstraction from 60 North Carolina hospitals (1996-1997).
  • Cardioprotective medication use categorized as aspirin alone, aspirin with beta-blockers, or aspirin with beta-blockers and ACE-inhibitors. Chronic kidney disease (CKD) defined by estimated glomerular filtration rate (GFR) 15-89 mL/min/1.73 m2. Cox proportional hazards regression used to analyze survival.

Main Results:

  • Prescription rates for combination cardioprotective therapy were lower in patients with severe CKD (GFR 15-29 mL/min/1.73 m2), with only 27.1% receiving aspirin with beta-blockers and 8.6% receiving triple therapy.
  • Cardioprotective medication use was associated with improved survival across all CKD severity levels.
  • In severe CKD, hazards ratios for death were 0.21 for aspirin alone, 0.17 for aspirin with beta-blockers, and 0.35 for aspirin with beta-blockers and ACE-inhibitors, indicating significant survival benefits.

Conclusions:

  • Patients with chronic kidney disease (CKD) demonstrate significant survival benefits from combination cardioprotective therapy after acute myocardial infarction (MI).
  • Despite these benefits, CKD patients are less likely to be prescribed these vital medications, suggesting treatment disparities.
  • Further research is needed to elucidate the reasons behind these observed undertreatment patterns in CKD patients post-MI.
Abstract

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