Journal article
In vitro validation of combined two-dimensional echo/Doppler method for cardiac output
Ultrasonic imaging, v 5(2), pp 176-176
1983
Abstract
We constructed an artifical aorta with pulsatile flow characteristics to test the accuracy of combined two-dimensional echo/Doppler technique for cardiac output measurement. The two-dimensional echocardiographic system was a phased array instrument with a 2.25 MHz transducer. The cross-sectional area of the aorta was imaged in a short axis view in the focal zone of the transducer (7.5 cm). A 2.25 MHz continuous wave Doppler transducer was positioned at an angle of 50° relative to the aorta. Good signal-to-noise ratios in the Doppler signal were obtained using a suspension of methylcellulose as a red blood cell substitute. The Doppler signal was digitized after passage through a high pass filter. These digitized tracings were averaged over ten beats. These values were then corrected for transducer angle and multiplied by the cross-sectional area of the aorta. The predicted cardiac output by the combined echo/Doppler technique was compared to the absolute cardiac output as measured by a 30 s collection of fluid in a graduated cylinder. Thirty separate cardiac output determinations were made ranging from 0.6 to 7.2 liters/minute. Linear regression analysis yielded the following results: y=O.96x + 0.02, SEEz0.5, r=0.96. Each echo/Doppler measurement was performed a minimum of 5 times with a standard deviation of 5 percent. In conclusion, accurate in vitro cardiac output measurements can be made -- using a combined two-dimensional echocardiographic/Doppler system with excellent results if the cross-sectional area of the aorta and the transducer angle are known.
Metrics
10 Record Views
Details
- Title
- In vitro validation of combined two-dimensional echo/Doppler method for cardiac output
- Creators
- Surender Singh - Drexel University, Medical College of Pennsylvania (1970-1993)Luigi Arena - Drexel University, Medical College of Pennsylvania (1970-1993)Ira Gubernick - Drexel University, Medical College of Pennsylvania (1970-1993)Steven Bloom - Drexel University, Medical College of Pennsylvania (1970-1993)Gaetano Capone - Drexel University, Medical College of Pennsylvania (1970-1993)Steven G. Meister - Drexel University, Medical College of Pennsylvania (1970-1993)Michael J. Barrett - Drexel University, Medical College of Pennsylvania (1970-1993)
- Publication Details
- Ultrasonic imaging, v 5(2), pp 176-176
- Conference
- 8th International Symposium on Ultrasonic Imaging and Tissue Characterization, 8th (Washington, District of Columbia, United States, 05 Jun 1983–08 Jun 1983)
- Publisher
- Elsevier
- Number of pages
- 1
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Health Management and Policy
- Web of Science ID
- WOS:A1983QS87600029
- Other Identifier
- 991019183943504721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Acoustics
- Engineering, Biomedical
- Radiology, Nuclear Medicine & Medical Imaging