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Currently, no reliable minimally invasive method of measuring cardiac output continuously in neonates and children undergoing cardiac surgery is available. An extravascular Doppler probe was used to measure cardiac output in 15 New Zealand White rabbits (average weight 3.5 kg, range 2.5-4.5 kg). The results obtained were compared with cardiac outputs determined using the aortic thermodilution principle. The mean cardiac outputs measured with the extravascular Doppler probe was 0.37 +/- 0.01 l/min as compared with 0.39 +/- 0.01 l/min with aortic thermodilution. Regression analysis revealed a close correlation (r = 0.973) between the two techniques. The extravascular Doppler techniques is an option for continuous and reliable cardiac output measurement in small animals used in surgical experiments (open chest models) and in neonates or children during surgical repair of complicated congenital heart conditions.

biomedizinische technik

Messung des Herzzeitvolumens an der Aorta ascendens mit extravaskulärer Doppler-Ultraschallsonde im Vergleich zur aortalen Thermodilution - Determination of Cardiac Output at the Ascending Aorta with an Extravascular Doppler Ultrasound Probe in Comparison with Aortic Thermodilution