The cardiac levels of nitrate and nitrite in patients with mild to severe c
hronic heart failure increased compared with levels in control subjects (9.
9 +/- 0.8 vs 3.8 +/- 0.3 mu moL/L, p <0.001), and there was a significant i
nverse correlation between cardiac levels of nitrate and nitrite and ejecti
on fraction (r = 0.71, p <0.001).