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The multiple inert gas elimination technique (MIGET).

Peter D Wagner1

  • 1Division of Physiology, Department of Medicine, University of California-San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0623A, USA. pdwagner@ucsd.edu

Intensive Care Medicine
|April 19, 2008
PubMed
Summary

The Multiple Inert Gas Elimination Technique (MIGET) measures pulmonary gas exchange to assess ventilation/perfusion ratios and shunting. This method also quanties diffusion limitations and extrapulmonary influences on oxygenation.

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Area of Science:

  • Physiology
  • Pulmonary Medicine
  • Medical Technology

Background:

  • The Multiple Inert Gas Elimination Technique (MIGET) was developed in the 1970s.
  • It is based on mass-conservation principles established by Rahn, Fenn, Riley, and coworkers in the 1950s.
  • MIGET relates ventilation/perfusion ratios to alveolar and capillary gas partial pressures.

Purpose of the Study:

  • To review the principles, information content, and limitations of MIGET.
  • To explain how MIGET quantifies ventilation/perfusion inequality and pulmonary shunting.
  • To describe MIGET's ability to identify diffusion limitations and extrapulmonary influences on oxygenation.

Main Methods:

  • Intravenous infusion of six different inert gases dissolved in saline or dextrose.
  • Measurement of pulmonary gas exchange for these inert gases.
  • Computation of ventilation/perfusion ratio distribution based on gas exchange data.

Main Results:

  • MIGET quantifies ventilation/perfusion inequality and pulmonary shunting.
  • The technique can identify and quantify diffusion limitation of O(2) exchange.
  • MIGET explains the impact of inspired O(2), ventilation, cardiac output, Hb, temperature, and acid/base state on arterial oxygenation.

Conclusions:

  • MIGET is a comprehensive tool for analyzing pulmonary gas exchange.
  • It provides insights into both intrapulmonary and extrapulmonary factors affecting oxygenation.
  • The review highlights MIGET's established utility and potential future applications in respiratory medicine.