The effect of the Valsalva maneuver on the circulation. II

摘要: Abstract 1. Mitral valvular disease prevents the overshoot in blood pressure and bradycardia normally seen after a Valsalva maneuver. It does so by preventing sufficient from reaching periphery post-straining period despite normal reflexes. 2. Tetraethylammonium chloride also this blocking vasopressor reflexes during immediately sustained straining. 3. Atropine blocks parasympathetic nervous system, Phase 4 is exaggerated prolonged, while abolished. Increased cardiac output atropine acting presence of constricted arterial system may partially explain 4. Venous rises similar manner straining, even administration tetraethylammonium or atropine.