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Measuring Cardiac Output during Cardiopulmonary Exercise Testing
Carlo Vignati1, Gaia Cattadori1,2
11 Heart Failure Unit, Centro Cardiologico Monzino, Istituto di Ricerca Clinica a Carattere Scientifico (IRCCS), Milan, Italy; and.
Insights
Noninvasive methods now allow direct measurement of cardiac output during exercise, improving cardiac function assessment for heart disease diagnosis and treatment. This offers a significant advancement over older invasive techniques.
Area of Science:
- Cardiology
- Physiology
Background:
- Cardiac output is crucial for assessing cardiac function and managing heart diseases.
- Historically, exercise cardiac output measurement relied on impractical invasive methods.
- Indirect parameters for exercise cardiac output lack significant clinical utility.
Purpose of the Study:
- To review the advancements in noninvasive cardiac output measurement during exercise.
- To highlight the clinical significance of accurate cardiac output determination.
Main Methods:
- Review of noninvasive techniques for cardiac output determination.
- Comparison with traditional invasive methods.
- Integration of techniques like transthoracic echocardiography with cardiopulmonary exercise testing.
Main Results:
- Several noninvasive techniques are now available for direct cardiac output measurement.
- These methods provide more definitive results compared to indirect surrogates.
- Noninvasive techniques enhance the understanding of exercise physiopathology.
Conclusions:
- Noninvasive cardiac output measurement during exercise is now clinically feasible.
- These advancements improve diagnosis, treatment, and prognostic evaluation of heart conditions.
- Direct measurement offers better insights into cardiac function during physical exertion.
Abstract:
Cardiac output is a key parameter in the assessment of cardiac function, and its measurement is fundamental to the diagnosis, treatment, and prognostic evaluation of all heart diseases. Until recently, cardiac output determination during exercise had been only possible through invasive methods, which were not practical in the clinical setting. Because [Formula: see text]o2 is cardiac output times arteriovenous content difference, evaluation of cardiac output is usually included in its measurement. Because of the difficulty of directly measuring peak exercise cardiac output, indirect surrogate parameters have been proposed, but with only modest clinical usefulness. Direct measurement of cardiac output can now be made by several noninvasive techniques, such as rebreathing inert gases, impedance cardiology, thoracic bioreactance, estimated continuous cardiac output technology, and transthoracic echocardiography coupled to cardiopulmonary exercise testing, which allow more definitive results and better understanding of the underlying physiopathology.
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