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A 20-year-old male asked:

How does valsalva maneuver slow the heart rate down? what's the mechanism?

1 doctor answer1 doctor weighed in
Dr. Ira Friedlander
Cardiac Electrophysiology 43 years experience
The valsalva does: not slow the heart rate. It increases the heart rate during the time of increase in intrathoracic pressure due to restricted venous return. Wikipedia has a nice and easy to understand description: https://en.wikipedia.org/wiki/Valsalva_maneuver. If you mean slowing or breaking an episode of SVT it is from compensatory increased vagal tone.

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