In recent years the multiple inert gas elimination technique (MIGET) has been developed to quantitate continuous distributions of ventilation-perfusion (V/Q) ratios in the lung. Based on the steady-state elimination of six gases of different solubilities, this technique provides information about the mechanism of impaired gas exchange in normal and diseased lungs by describing alterations in V/Q distributions. A better understanding of a patient's clinical course is made possible by the MIGET's identification of specific gas exchange patterns, which aid in the interpretation of pathophysiologic mechanisms. Correlations of the observed gas exchange patterns with etiology, response to treatment, and prognosis elucidate the mechanisms of hypoxemia.
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