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Related Experiment Videos

Lung fluid and impedance cardiography

L A Critchley1, J A Critchley

  • 1Department of Anaesthesia & Intensive Care, Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, People's Republic of China.

Anaesthesia
|June 5, 1998
PubMed
Summary

Impedance cardiography may inaccurately measure cardiac output in critically ill patients due to increased lung fluid. Thermodilution is more reliable in these specific patient populations.

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Area of Science:

  • Critical care medicine
  • Cardiovascular physiology
  • Medical instrumentation

Background:

  • Cardiac output monitoring is crucial for managing critically ill patients.
  • Impedance cardiography (ICG) is a non-invasive method for assessing cardiac output.
  • Previous studies suggest ICG is reliable in healthy subjects.

Observation:

  • Two critically ill patients underwent serial thermodilution and ICG measurements.
  • ICG failed to detect cardiac output changes and yielded lower values compared to thermodilution.
  • Chest X-ray and thoracic impedance changes indicated increased extravascular lung water in both patients.

Findings:

  • Increased extravascular lung water significantly impacts ICG accuracy.
  • Aberrant electrical conduction through fluid-laden lungs alters the impedance waveform.
  • ICG measurements were unreliable in these critically ill patients with pulmonary edema.

Implications:

  • ICG may not be suitable for cardiac output monitoring in critically ill patients with elevated lung water.
  • Clinicians should consider alternative methods like thermodilution in such cases.
  • Further research is needed to understand ICG limitations in complex patient conditions.

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