Valsalva Maneuver (IMAGE) University of Plymouth Caption Incorporating a passive leg raise in the Valsalva maneuver increases its effectiveness by more than a quarter, according to research published in The Lancet. Credit Plymouth University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.