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Three-dimensional presentation of tissue oxygenation parameters.

From the Fick equation comes that VO2 = DO2 x O2ER, where VO2--oxygen consumption, DO2--oxygen delivery, O2ER--oxygen extraction ratio. These 3 factors can be represented in one figure using the fy = fx x fz equation. This equation spans a surface representing all the possible movements and relationships of tissue oxygenation parameters, helping in this way to evaluate the problems of tissue oxygenation more precisely.