― Anton Maria Valsalva (1707) ‘De Aure Humane (anatomy and diseases of human ear) described ways of raising intrathoracic pressure. ∙ Weber (1860) described cardiovascular effects of Valsalva maneuver i.e. all the sound disappear with strain of Valsalva ∙ Hamilton et al (1944) reported Valsalva effects in CCF patients. ∙ Valsalva equivalent procedure ∙ Patient is asked to push back against examiner hand, which is pressed downwards on patients mid abdomen. This elicits [...].