NPPB and angina pectoris: Among other effects are inhibition of the Renin-Angiotensin-Aldosterone system(RAAS), and sympathetic nervous system.7 After an ischemic occurrence, BNP levels peak in 14 and 40 hours.One of the most frequent reasons for admission to CCU is Non ST segment- elevation Myocardial infarction (NSTEMI), which could have a number of causes.8 BNP levels were found to be more in stable angina than in unstable angina (UA)in another cross-sectional analysis.9