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[The dependability of noninvasive stroke volume measurements with impedance cardiography]
Acta Medica Austriaca
|January 1, 1978
Insights
Impedance cardiography offers moderate agreement with thermodilution for stroke volume measurement. While not precise for individual patients, it effectively predicts significant hemodynamic changes in stroke volume and cardiac output.
Area of Science:
- Cardiovascular Physiology
- Medical Instrumentation
Context:
- Hemodynamic monitoring is crucial for assessing cardiac function.
- Thermodilution is a standard method for measuring stroke volume.
- Non-invasive methods are sought to complement or replace invasive techniques.
Purpose:
- To compare the accuracy of impedance cardiography (ICG) against thermodilution (TD) for stroke volume (SV) measurement.
- To evaluate the utility of ICG in detecting acute changes in hemodynamic parameters.
Summary:
- 110 comparative measurements of stroke volume were performed in 33 patients using both thermodilution and impedance cardiography.
- Moderate agreement was observed between the two methods, indicating ICG is not suitable for accurate individual stroke volume estimation.
- Impedance cardiography demonstrated utility in predicting acute changes in stroke volume or cardiac output exceeding 10%.
Impact:
- Findings suggest impedance cardiography can be a valuable tool for monitoring dynamic changes in cardiac output in clinical settings.
- This non-invasive technique may aid in the rapid assessment of patient response to interventions.
- Further research could refine ICG protocols for improved stroke volume quantification.
Abstract:
In 33 patients 110 comparative measurements of stroke volume were performed by the thermodilution method and impedance cardiography during rest and various hemodynamic interventions. Agreement was moderate not allowing accurate estimation of the stroke volume in an individual patient. However, impedance cardiography proved useful in predicting acute changes in stroke volume or cardiac output exceeding 10% of control values.