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Histograms obtained by local monitoring in patients: significance of arterial and venous intracapillary HbO2 and distribution of blood in supply units of tissue

For many purposes of optical monitoring the use of imaging is not necessary, because other less expensive instruments can provide excellent histograms. Normal as well as cumulated histograms reveal the following information: The lowest HbO2 can describe normal or critical values at the venous end of blood capillaries. The intermediate HbO2 characterizes the position of the histogram and the highest one corresponds to the highest arterial sides. The recording of Hb is very important because it reveals information of distribution of blood within the supply units of capillary trees.