Why does the LiMON not measure cardiac output from the dye dilution?
The transmission through the tissue of the wave length used by the LiMON is not only dependent on the concentration of ICG-PULSION, but also on further parameters, e.g. the thickness of the finger of the patient. The LiMON determines from the measured change in transmission the changes of the ICG concentration in the blood of the patient and hence the plasma disappearance rate (PDR). For the determination of cardiac output (CO), not only the concentration change, but also the absolute concentration of ICG-PULSION in the blood is required. Currently this is not achievable with sufficient accuracy by a non invasive, optical measurement.
