AGT and congestive heart failure: Serum Ang II levels were significantly higher in the patients with CHF (NYHA II, NYHA III, and NYHA IV) than in the healthy controls (P<0.05), higher in the NYHA III and NYHA IV groups than in the NYHA II group (P<0.05), and higher in the NYHA IV group than in the NYHA III group (P<0.05).