• Andrew J. Larner


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.


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

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Andrew J. Larner
    • 1
  1. 1.Walton Centre for Neurology & NeurosurgeryLiverpoolUK

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