[Massive heroin intoxication. Hemodynamic studies].

Acute hemodynamic changes during heroin overdose have not been frequently reported. We observed 2 male patients aged 24 and 21 years admitted in coma and shock and presenting severe mixed acidosis, with, respectively, pH 6.80, PaCO2 72 mm Hg, PaO2 70 mm Hg, BE -18 mEq/l, lactic acid 16.5 mmol/l, and pH 6.86, PaCO2 94 mm Hg, PaO2 46 mm Hg, BE -16 mEq/l, lactic acid 5.45 mmol/l. The hemodynamic data of the first patient showed a low output failure state associated with high filling pressures, suggesting biventricular heart failure. In the second case, clinically and radiologically marked pulmonary edema was associated with a hyperdynamic state and moderately elevated pulmonary artery pressure, but normal pulmonary capillary pressure. The possible pathophysiological mechanisms of those different, hemodynamic patterns are discussed.