Relation of N-terminal pro-B-type natriuretic peptide to severity of valvular aortic stenosis

The American Journal of Cardiology
Michael WeberC Hamm

Abstract

N-terminal pro-B-type natriuretic peptide (NT-proBNP) has been shown to be a reliable biochemical marker for left ventricular wall stress and is increased in patients with aortic stenosis (AS). We evaluated the role of NT pro-BNP as a biochemical marker in the diagnosis of AS and whether it contributes to the optimal timing for aortic valve replacement (AVR). Included in this study were 146 patients who had AS, 31 who underwent AVR, and 32 who had "normal valve function" (controls). Increased NT pro-BNP was closely linked to severity of AS (mild AS 612 +/- 151 pg/ml, moderate AS 1,441 +/- 32 pg/ml, severe AS 2,579 +/- 13 pg/ml, AVR 593 +/- 148 pg/ml, controls 140 +/- 27 pg/ml; p <0,01) and to New York Heart Association functional class (class I 601 +/- 116 pg/ml, class II 1,119 +/- 216 pg/ml, class III 1,998 +/- 459 pg/ml, class IV 5,107 +/- 1,512 pg/ml; p <0.01). Area under the receiver-operating characteristic curve for NT pro-BNP as a predictor for AVR was 0.73. Using an optimized cutoff of 550 pg/ml for NT-proBNP, the positive predictive value was 85%. Thus, NT pro-BNP is linked to severity of AS and New York Heart Association class and is an indication for AVR. Therefore, it is a useful biochemical marker to evaluate sever...Continue Reading

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