Difficulties in noninvasive cardiac stroke volume determination in "small" blood circulation systems] |
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Authors: | S Vogt D Troitzsch B Kusch R Moosdorf |
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Institution: | Klinik für Herzchirurgie am Herzzentrum des Klinikums, Philipps-Universit?t Marburg. vogts@mailer.uni-marburg.de |
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Abstract: | Pulsewave velocity analysis is an option for the noninvasive determination of cardiac output and the evaluation of additional haemodynamic parameters. An algorithm we developed ourselves has been established as a method for the measurement of cardiac output in rabbits. The effectiveness of this program was investigated by monitoring controlled hypoxia-induced alterations in the circulatory system. Calculated values were compared with direct measurements of cardiac output with a Doppler flow probe placed in the ascending aorta. Within the physiological framework of blood gas analysis, a good correlation was found between the two methods. In the case of hypoxia-induced depression, however, the two methods showed diverging results, presumably due to arrhythmia-induced wave reflections within the arterial vascular tree. This makes an extension of the algorithm necessary to take account for these case. |
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