Doc Labs ™ on Instagram: "This video shows a modified Valsalva maneuver being used in the emergency treatment of stable SVT (supraventricular tachycardia)! This awesome ER team was able to temporarily convert a stable paroxysmal SVT back into sinus rhythm! This is a beautiful example of how manipulating nervous system & leveraging physiology can be used as a simple, cost-free treatment. So, how does it work: The modified Valsalva can be divided into 3 phases: * Phase 1: Increasing intrathoracic