Validation of a Doppler technique for beat-to-beat measurement of cardiac output
| Autor: | V.I. Iyawe, E. D. Bennett, K.B. Saunders, A. R. C. Cummin, S. Bayley, N. Mehta |
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| Rok vydání: | 1985 |
| Předmět: |
Adult
Male Cardiac output medicine.medical_specialty Blood velocity Physical Exertion Thermodilution Nitrous Oxide Beat (acoustics) Hemodynamics Electrocardiography symbols.namesake medicine.artery Internal medicine Ascending aorta medicine Cardiovascular problems Humans Ultrasonics Cardiac Output Aorta Mathematics Liter General Medicine Cardiovascular Diseases Anesthesia symbols Cardiology Female Doppler effect Blood Flow Velocity |
| Zdroj: | Clinical Science. 69:377-382 |
| ISSN: | 1470-8736 0143-5221 |
| DOI: | 10.1042/cs0690377 |
| Popis: | 1. We have measured aortic flow in the ascending aorta in man with a Bach-Simpson BVM 202 blood velocity meter, and aortic root diameter by M-mode echocardiography, and thus derived beat-to-beat cardiac output (Q). 2. We tested the technique in 21 patients (53 comparisons) with various cardiovascular problems against a thermodilution method, and in four normal subjects at rest and two levels of exercise (50 and 100 W) against a nitrous oxide rebreathing method. 3. We obtained excellent overall correlation in a range of 0.5–10 litres/min (r = 0.98, n = 77, sy,x = 0.48 litre/min), the formula for the least squares regression being: (Q Doppler) = 0.95 (Q Thermodilution/N2O) + 0.11 litre/min. 4. The Doppler signal is sufficiently noise-free to obtain maximum acceleration of flow from the first derivative of velocity. |
| Databáze: | OpenAIRE |
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