Analise da troca pulmonar em pacientes submetidos a revascularização do miocardio com a utilização de circulação extracorporea

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Introduction: Pulmonary gas exchange analysis in patients who have undergone myocardial revascularization using the extracorporeal circulation (ECC). Objective: Identify the changes that occur during pulmonary gas exchange applying gasometric parameters in patients who have undergone myocardial revascularization using ECC. Methodology: This study was performed on 66 patients who underwent myocardial revascularization using ECC between January, 2000 and December, 2001. The gasometric parameters and the pulmonary gas exchange rates were analyzed. Results: The study population was composed of 71,21% males and 28,79% females. The number of grafts per surgical procedure varied: 1 (2); 2 (15); 3(25); 4 (23) and 5 (1). The carbon dioxide partial pressure (Pac02) parameter revealed a significant tendency in relation to the co-variable sex (P=O.0584),with the male sex presenting a higher mean during the entire surgery. The Pac02 was affected by the time of mechanical ventilation (P=O.0389). Partial oxygen pressure (Pam) presented statistically significant results when compared with time of ECC (P =0.0370) and tidal volume (VT) used during surgery (P=O.0483). When repeated measures were compared with the covariables to verify the effect over a period of time, significant interaction was observed between time and VT (P =0.0116). No evidence was observed that the oxygen saturation parameter depended on the effect of the covariables; however there was a significant interaction between time and VT. With regard to the fraction of inspired oxygen (FI<>2) parameter, as previously demonstrated, significam interaction was observed between time and VT (P =0.0130). Hence, the covariable VT was observed to affect the FI<>2 values in a different manner over a period of time. The analysis also showed that the VT covariable demonstrated a significam difference in relation to sex (p=O.0020). There was a significant interaction between the covariables time and number of grafts (P=O.0399). Covariables such as sex, time ofECC presented a significant difference in relation to hemoglobin (Hb). There was a significant interaction between time and sex (P=O.0054).The alveolar-arterial gas pressure difference (A-aD<>2) and respiratory rate did not present significant correlation with any of the covariables. Only time and VT demonstrated a significant correlation. The alveolar-arterial oxygen and the degree of oxygenation due to the tidal wave demonstrated a tendency to be significam. Conclusion: The arterial blood samples collected from patients who underwent myocardial revascularization with ECC helped correlate pulmonary gas exchange with factors that interfere in the process such as: sex, time of mechanical ventilation, time of ECC and VT-The alveolar-arterial oxygen pressure difference, the respiratory index, the arterial-alveolar oxygen ratio and the oxygen index changed during the surgery due to the use of VT

ASSUNTO(S)

troca gasosa pulmonar sangue - circulação extracorporea

ACESSO AO ARTIGO

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