Valsalva Maneuver - StatPearls - NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK537248/
WebAug 21, 2023 · Valsalva maneuver (VM) is a simple, non-invasive test that can be easily performed using a mouthpiece and a manometer. While the maneuver is relatively safe, it is prudent to rule out any pre-existing disease of the retina before performing the maneuver.
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