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Journal Article
Research Support, Non-U.S. Gov't
Identification of potential outcome benefit from ACE inhibition after acute coronary syndrome: a biomarker approach using N-terminal proBNP.
Heart 2010 June
OBJECTIVE: To consider whether patients most likely to benefit from ACE inhibition in routine practice after acute coronary syndrome (ACS) may be identified from plasma natriuretic peptide concentrations.
DESIGN: Observational cohort study.
SETTING: Teaching hospital coronary care unit.
PATIENTS: 1725 patients admitted with acute coronary syndrome (56.3% ST elevation ACS; median age 67, range 24-97 years).
MEASUREMENTS: Using Cox proportional hazards analysis, we assessed the adjusted predictive value for major adverse cardiac events (MACE) of prescription of an ACE inhibitor, of plasma N-terminal pro B-type natriuretic peptide (NT-proBNP) and for interaction between these factors. To adjust for demographic differences between patients prescribed or not prescribed an ACE inhibitor, a factor correcting for likelihood of ACE inhibitor prescription (propensity score) was included in the analysis.
OUTCOME MEASURES: The primary end point was the occurrence of MACE (death, recurrent myocardial infarction or hospitalisation with heart failure).
RESULTS: During the index admission ACE inhibitor was prescribed for 1267/1725 (73.4%) patients. During follow-up (median 528 days, range 0-3873 days), 534/1725 patients experienced MACE. After covariable adjustment, NT-proBNP showed linear association with risk of MACE (p<0.005), strongest for patients with NT-proBNP in the top quartile of observed values (HR=2.768, p<0.001). Only for patients with NT-proBNP in the top quartile was prescription of ACE inhibitor associated with reduction in risk of MACE (HR=0.532, p=0.003). This association was maintained after correction for propensity scores (HR=0.599, p=0.003).
CONCLUSIONS: Prognostic benefit from ACE inhibition was seen only in patients with the most marked elevation of plasma NT-proBNP. Plasma NT-proBNP may be a useful indicator of the appropriateness of individual prescription of ACE inhibitor treatment across the spectrum of ACS.
DESIGN: Observational cohort study.
SETTING: Teaching hospital coronary care unit.
PATIENTS: 1725 patients admitted with acute coronary syndrome (56.3% ST elevation ACS; median age 67, range 24-97 years).
MEASUREMENTS: Using Cox proportional hazards analysis, we assessed the adjusted predictive value for major adverse cardiac events (MACE) of prescription of an ACE inhibitor, of plasma N-terminal pro B-type natriuretic peptide (NT-proBNP) and for interaction between these factors. To adjust for demographic differences between patients prescribed or not prescribed an ACE inhibitor, a factor correcting for likelihood of ACE inhibitor prescription (propensity score) was included in the analysis.
OUTCOME MEASURES: The primary end point was the occurrence of MACE (death, recurrent myocardial infarction or hospitalisation with heart failure).
RESULTS: During the index admission ACE inhibitor was prescribed for 1267/1725 (73.4%) patients. During follow-up (median 528 days, range 0-3873 days), 534/1725 patients experienced MACE. After covariable adjustment, NT-proBNP showed linear association with risk of MACE (p<0.005), strongest for patients with NT-proBNP in the top quartile of observed values (HR=2.768, p<0.001). Only for patients with NT-proBNP in the top quartile was prescription of ACE inhibitor associated with reduction in risk of MACE (HR=0.532, p=0.003). This association was maintained after correction for propensity scores (HR=0.599, p=0.003).
CONCLUSIONS: Prognostic benefit from ACE inhibition was seen only in patients with the most marked elevation of plasma NT-proBNP. Plasma NT-proBNP may be a useful indicator of the appropriateness of individual prescription of ACE inhibitor treatment across the spectrum of ACS.
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