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The historical evolution of bioimpedance
1Department of Engineering, CardioDynamics International Corporation, San Diego, California, USA.
AACN Clinical Issues
|April 4, 2000
Summary
Thoracic electrical bioimpedance (TEB) noninvasively tracks cardiac cycle volume changes. Advanced signal processing and algorithms enhance TEB accuracy for continuous cardiac output monitoring.
Area of Science:
- Biomedical Engineering
- Physiology
Background:
- Thoracic electrical bioimpedance (TEB) technology measures volumetric changes during the cardiac cycle.
- Early TEB applications date back to the 1960s.
Observation:
- TEB measurements are noninvasive and continuous.
- Technological advancements, including microprocessors and improved algorithms, have increased TEB sophistication and accuracy.
- Enhanced understanding of the cardiac cycle, aided by echocardiography and MRI, has benefited TEB development.
Findings:
- TEB converts thoracic impedance changes into volume changes over time.
- Modern data signal processing and mathematical algorithms improve TEB accuracy.
Implications:
- Noninvasive cardiac output monitoring using TEB is expanding in clinical use.
- TEB is increasingly compared to established methods like thermodilution and Fick methods.