What is the role of fluoroscopy in the workup of hypoventilation syndromes?

Updated: Jul 22, 2021
  • Author: Jazeela Fayyaz, DO; Chief Editor: Guy W Soo Hoo, MD, MPH  more...
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The fluoroscopic "sniff test" (in which paradoxical elevation of the paralyzed diaphragm is seen during inspiratory effort against a closed glottis) can confirm chest radiographic findings regarding unilateral diaphragmatic paralysis. This test is less useful in the diagnosis of bilateral diaphragmatic paralysis.

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