Behind the Valsalva

The Effect of the Valsalva

Physiologic changes in the circulatory system caused by performing the Valsalva maneuver are blunted or absent in patients with congestive heart failure. Previously there has been no noninvasive method for examining cardiac chamber size during this maneuver. M-mode echocardiography was used to evaluate possible changes in cardiac chamber dimensions in 12 normal subjects (group I) and 15 patient...

behind the scenes of surrogacy

Valsalva manoeuvrel

Ten normal male volunteers received either TOO mg alprenolol or placebo in a double-blind randomized trial. Ninety minutes later they performed a standardized Valsalva manoeuvre 40: mmHg airway pressure for 12 seconds. Beat-to-beat measurements were made of heart rate, left ventricular ejection time (LVET), ejection time index (ETI), and' corrected ejection time' (LVET/Vye). After placebo, hear...

What’s behind meaning?

The paper addresses the main questions to be dealt with by any semantic theory which is committed to provide an explanation of how meaning is possible. On one side the paper argues that the resources provided by the development of mathematical logic, theoretical computer science, cognitive psychology, and general linguistics in the 20th Century, however indispensable to investigate the structur...

Teaching in the Laboratory Teaching cardiac autonomic function dynamics employing the Valsalva (Valsalva-Weber) maneuver

Junqueira LF Jr. Teaching cardiac autonomic function dynamics employing the Valsalva (Valsalva-Weber) maneuver. Adv Physiol Educ 32: 100–106, 2008; doi:10.1152/advan.00057.2007.—In this report, a brief history of the Valsalva (Valsalva-Weber) maneuver is outlined, followed by an explanation on the use of this approach for the evaluation of cardiac autonomic function based on underlying heart ra...