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Figure 1 Mean plasma concentrations (µmol/L) of NOx from arterial (closed circles), peripheral venous (open triangles) and coronary sinus (open squares) plasma in control patients and in patients with AMI. Plasma NOx concentrations are significantly elevated above control values, at 48 and 72 h after onset of symptoms (p < 0.01). Values for NOx in coronary sinus plasma significantly exceed those in peripheral venous plasma from 24 to 72 h after onset of symptoms (p < 0.05). The NOx values in coronary sinus plasma also significantly exceed those in arterial plasma from 24 to 72 h after onset of symptoms (p < 0.05).