20577
Measurements of cardiac troponins or brain - type natriuretic peptide ( BNP ) and its precursor , N - terminal brain - type natriuretic peptide ( NT - proBNP ) , have become indispensable in the evaluation of patients with acute coronary syndromes and heart failure , respectively , constituting an integral part of the diagnostic algorithm and risk stratification of these conditions .
 N
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 N