General practice Cohort study of plasma natriuretic peptides for identifying left ventricular systolic dysfunction in primary care

Objectives: To determine whether blood natriuretic peptide concentrations are helpful in identifying or excluding left ventricular systolic dysfunction in stable survivors of acute myocardial infarction. Design: Comparison of blood natriuretic peptide concentrations with echocardiographic assessment of left ventricular systolic function in a general practice population. Setting: Practices in Western District of Glasgow audit group. Subjects: 134 long term survivors of myocardial infarction recalled for echocardiography as part of a primary care secondary prevention audit. Main outcome measures: Area under the receiver operating curve for brain natriuretic peptide and N-terminal atrial natriuretic peptide. Results: Brain natriuretic peptide was of some diagnostic utility in identifying the minority of subjects with severe left ventricular dysfunction (area under curve = 0.73) but was unable to discriminate between patients with moderately severe dysfunction and those with preserved left ventricular function (area under curve for moderate or severe dysfunction = 0.54). The corresponding values for N-terminal atrial natriuretic peptide for severe and moderate or severe dysfunction were 0.55 and 0.56 respectively. Conclusions: Blood natriuretic peptide concentrations are not useful in identifying important left ventricular systolic dysfunction in stable survivors of myocardial infarction.