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A Dictionary of Neurological SignsV

A Dictionary of Neurological Signs: V [The Valsalva manoeuvre is a simple test of autonomically mediated cardiovascular reflexes, comprising forced expiration against resistance (‘straining’), followed by release of the resistance and completion of expiration. The first phase produces impaired cardiac filling due to impaired venous return as a consequence of elevated intrathoracic pressure, with a fall in cardiac output and blood pressure, inducing peripheral vasoconstriction (sympathetic pathways) to maintain blood pressure. The second phase causes a transient overshoot in blood pressure as the restored cardiac output is ejected into a constricted circulation, followed by reflex slowing of heart rate.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

A Dictionary of Neurological SignsV

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Publisher
Springer New York
Copyright
© Springer Science+Business Media, LLC 2011
ISBN
978-1-4419-7094-7
Pages
359 –367
DOI
10.1007/978-1-4419-7095-4_22
Publisher site
See Chapter on Publisher Site

Abstract

[The Valsalva manoeuvre is a simple test of autonomically mediated cardiovascular reflexes, comprising forced expiration against resistance (‘straining’), followed by release of the resistance and completion of expiration. The first phase produces impaired cardiac filling due to impaired venous return as a consequence of elevated intrathoracic pressure, with a fall in cardiac output and blood pressure, inducing peripheral vasoconstriction (sympathetic pathways) to maintain blood pressure. The second phase causes a transient overshoot in blood pressure as the restored cardiac output is ejected into a constricted circulation, followed by reflex slowing of heart rate.]

Published: Oct 15, 2010

Keywords: Essential Tremor; Persistent Vegetative State; Cross Reference; Posterior Cortical Atrophy; Homonymous Hemianopia

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