Documentation of vasomotor dysfunction by indicator dilution curve analysis.

Indocyanine green dye dilution curves with abnormal contours have been recorded in four patients with acute and critical illnesses using standardized recording methods. The abnormal curves are characterized by a high and prolonged concentration of dye occurring after the peak concentration. This altered contour can be detected by use of routine mathematical processing since the derived hemodynamic parameters are affected by the altered contour. A physiologic basis for the altered curve contour is proposed.