title: An improved program to calculate intrapulmonary shunting.
abstract: A computer program was developed to calculate intrapulmonary venous admixture on a Texas Instruments TI 59 programmable calculator. The program incorporates the following characteristics: 1) a correction for saturated water vapor pressure which varies with body temperature; 2) a mathematical model of the standard oxyhemoglobin dissociation curve; and 3) correction factors for shifts of the dissociation curve due to variations in pH and carbon dioxide tension. It also corrects oxygen tensions obtained at electrode temperature to those at patient temperature, and calculates variations of the Bunsen solubility coefficient of oxygen in blood with body temperature.
mesh_terms: D001701:Bionics; D002245:Carbon Dioxide / Q000097:blood*; D006801:Humans; D007362:Intensive Care Units; D008722:Methods; D010100:Oxygen / Q000097:blood; D010108:Oxyhemoglobins / Q000032:analysis*; D010313:Partial Pressure; D011652:Pulmonary Circulation
chemical_list: D010108:Oxyhemoglobins; D002245:Carbon Dioxide; D010100:Oxygen