Average ± SD mean arterial pressure (MAP), heart rate (HR), left ventricular systolic pressure (LVSP), and dP/dt max in the 10 rats exposed to 0.75 mg/kg/min KCN. Data have been compared to the effects of an infusion of KCl (equimolar infusion, 11.5 micromol/kg/min). In marked contrast to KCl infusion, all cardiac parameters significantly decreased within 330 sec into KCN infusion leading to PEA within 7–8 minutes. Note that the first rats died by PEA (LVSP < 10 mmHg) at 400 sec. * Significantly different from baseline, p<0.05.