• Marcelo Park, Pedro Vitale Mendes, Costa Eduardo Leite Vieira EL Instituto de Ensino e Pesquisa, Hospital Sírio-Libanês, São Paulo, SP, Brazil., Edzangela Vasconcelos Santos Barbosa, Adriana Sayuri Hirota, and Azevedo Luciano Cesar Pontes LC Instituto de Ensino e Pesquisa, Hospital Sírio-Libanês, São Paulo, SP, Brazil..
• Instituto de Ensino e Pesquisa, Hospital Sírio-Libanês, São Paulo, SP, Brazil.
• Rev Bras Ter Intensiva. 2016 Jan 1; 28 (1): 11-8.

ObjectiveThe aim of this study was to explore the factors associated with blood oxygen partial pressure and carbon dioxide partial pressure.MethodsThe factors associated with oxygen - and carbon dioxide regulation were investigated in an apneic pig model under veno-venous extracorporeal membrane oxygenation support. A predefined sequence of blood and sweep flows was tested.ResultsOxygenation was mainly associated with extracorporeal membrane oxygenation blood flow (beta coefficient = 0.036mmHg/mL/min), cardiac output (beta coefficient = -11.970mmHg/L/min) and pulmonary shunting (beta coefficient = -0.232mmHg/%). Furthermore, the initial oxygen partial pressure and carbon dioxide partial pressure measurements were also associated with oxygenation, with beta coefficients of 0.160 and 0.442mmHg/mmHg, respectively. Carbon dioxide partial pressure was associated with cardiac output (beta coefficient = 3.578mmHg/L/min), sweep gas flow (beta coefficient = -2.635mmHg/L/min), temperature (beta coefficient = 4.514mmHg/ºC), initial pH (beta coefficient = -66.065mmHg/0.01 unit) and hemoglobin (beta coefficient = 6.635mmHg/g/dL).ConclusionIn conclusion, elevations in blood and sweep gas flows in an apneic veno-venous extracorporeal membrane oxygenation model resulted in an increase in oxygen partial pressure and a reduction in carbon dioxide partial pressure 2, respectively. Furthermore, without the possibility of causal inference, oxygen partial pressure was negatively associated with pulmonary shunting and cardiac output, and carbon dioxide partial pressure was positively associated with cardiac output, core temperature and initial hemoglobin.

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