Assessment of beat to beat changes in cardiac output during the Valsalva manoeuvre using electrical bioimpedance cardiography
- 31 March 1987
- journal article
- research article
- Published by Portland Press Ltd. in Clinical Science
- Vol. 72 (4) , 423-428
- https://doi.org/10.1042/cs0720423
Abstract
Beat to beat changes in cardiac output during standardized Valsalva''s manoeuvres were recorded using electrical bioimpedance cardiography in 13 normal subjects. Cardiac output increased by 12 .+-. 5% after 1 s of straining solely because of an increase in heart rate. Subsequently, cardiac stroke volume and cardiac output fell during the strain to lows of -40 .+-. 6% and -21 .+-. 3% respectively at 15 s. There was a sustained increase in cardiac output (maximum - 17 .+-. 4%) in the late post strain period. The mean coefficient of variation in impedance measurements of cardiac output was 6.8% during all parts of Valsalva''s manoeuvre, with no single value exceeding 10%.This publication has 4 references indexed in Scilit:
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