title: The relation between serum phosphorus levels and clinical outcomes after acute myocardial infarction.
abstract: BACKGROUND
  Elevated serum phosphorus levels have been linked with cardiovascular disease and mortality with conflicting results, especially in the presence of normal renal function.
  
  
  METHODS
  We studied the association between serum phosphorus levels and clinical outcomes in 1663 patients with acute myocardial infarction (AMI). Patients were categorized into 4 groups based on serum phosphorus levels (<2.50, 2.51-3.5, 3.51-4.50 and >4.50 mg/dL). Cox proportional-hazards models were used to examine the association between serum phosphorus and clinical outcomes after adjustment for potential confounders.
  
  
  RESULTS
  The mean follow up was 45 months. The lowest mortality occurred in patients with serum phosphorus between 2.5-3.5 mg/dL, with a multivariable-adjusted hazard ratio of 1.24 (95% CI 0.85-1.80), 1.35 (95% CI 1.05-1.74), and 1.75 (95% CI 1.27-2.40) in patients with serum phosphorus of <2.50, 3.51-4.50 and >4.50 mg/dL, respectively. Higher phosphorus levels were also associated with increased risk of heart failure, but not the risk of myocardial infarction or stroke. The effect of elevated phosphorus was more pronounced in patients with chronic kidney disease (CKD). The hazard ratio for mortality in patients with serum phosphorus >4.5 mg/dL compared to patients with serum phosphorus 2.50-3.50 mg/dL was 2.34 (95% CI 1.55-3.54) with CKD and 1.53 (95% CI 0.87-2.69) without CKD.
  
  
  CONCLUSIONS
  We found a graded, independent association between serum phosphorus and all-cause mortality and heart failure in patients after AMI. The risk for mortality appears to increase with serum phosphorus levels within the normal range and is more prominent in the presence of CKD.
authors.affiliation: Department of Cardiology, Rambam Medical Center, Haifa, Israel. daronson@tx.technion.ac.il
authors.forename: Doron
authors.initials: D
authors.lastname: Aronson
authors.forename: Michael
authors.initials: M
authors.lastname: Kapeliovich
authors.forename: Haim
authors.initials: H
authors.lastname: Hammerman
authors.forename: Robert
authors.initials: R
authors.lastname: Dragu
mesh_terms: D000368:Aged; D002423:Cause of Death; D005260:Female; D005919:Glomerular Filtration Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000097:blood* / Q000401:mortality*; D010758:Phosphorus / Q000097:blood*; D011379:Prognosis; D016016:Proportional Hazards Models; D051436:Renal Insufficiency, Chronic / Q000097:blood / Q000401:mortality / Q000503:physiopathology
chemical_list: D010758:Phosphorus