title: A nomogram for the determination of "virtual shunt" with correction factors for variations in pH, temperature and hemoglobin concentration.
abstract: Several nomograms are currently in use for determination of virtual shunt from a known FIO2 and PaO2. They are constructed for fixed standard values of pH, T and Hb. In the critically ill however those values often vary widely from the standard values. This may lead to substantial under- or overestimation of the virtual shunt. We therefore calculated correction factors resulting in a more precise value for the virtual shunt.
mesh_terms: D001831:Body Temperature; D006454:Hemoglobins / Q000032:analysis*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D000860:Hypoxia / Q000503:physiopathology; D010100:Oxygen / Q000097:blood; D010313:Partial Pressure; D011659:Pulmonary Gas Exchange
chemical_list: D006454:Hemoglobins; D010100:Oxygen