title: [Oxygen Leukocyte Larceny].
abstract: The authors present a case of a 60-year-old male patient, previously diagnosed with B-cell chronic lymphocytic leukemia, who was admitted to the Emergency Room with dyspnea. The initial evaluation revealed severe anemia (Hgb = 5.0 g/dL) with hyperleukocytosis (800.000/µL), nearly all of the cells being mature lymphocytes, a normal chest X-ray and a low arterial oxygen saturation (89%; pulse oximetry). After red blood cell transfusion, Hgb values rose (9.0 g/dL) and there was a complete reversion of the dyspnea. Yet, subsequent arterial blood gas analysis, without the administration of supplemental oxygen, systematically revealed very low oxygen saturation values (~ 46%), which was inconsistent with the patientâs clinical state and his pulse oximetry values (~ 87%), and these values were not corrected by the administration of oxygen via non-rebreather mask. The investigation performed allowed to establish the diagnosis of oxygen leukocyte larceny, a phenomenon which conceals the true oxygen saturation due to peripheral consumption by leukocytes.
authors.affiliation: Serviço de Patologia Clínica. Centro Hospitalar de Vila Nova de Gaia/Espinho. Vila Nova de Gaia.
authors.forename: Miguel
authors.initials: M
authors.lastname: Pinto da Costa
authors.affiliation: Serviço de Hematologia Clínica. Centro Hospitalar de Vila Nova de Gaia/Espinho. Vila Nova de Gaia.
authors.forename: Henrique
authors.initials: H
authors.lastname: Pimenta Coelho
mesh_terms: D006801:Humans; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000150:complications / Q000378:metabolism*; D007962:Leukocytes / Q000378:metabolism*; D007964:Leukocytosis / Q000209:etiology / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption