Final answer:
Option C. PVFM is diagnosed by observing normal vocal cord movement through laryngoscopic visualization, distinguishing it from vocal cord paralysis, polyps, or tracheal stenosis.
Step-by-step explanation:
The diagnosis of Paradoxical Vocal Fold Motion (PVFM) can be confirmed through direct laryngoscopic visualization, which would show normal vocal cord movement as opposed to vocal cord paralysis, polyps, or tracheal stenosis. During this procedure, a doctor looks at the vocal cords and evaluates their movement. In the case of PVFM, the vocal cords behave differently than normal by closing when they should open, for example, during inhalation, but they are not paralyzed or structurally altered by lesions such as polyps or affected by conditions like tracheal stenosis.
Diagnosis of PVFD (Paradoxical Vocal Fold Dysfunction) can be confirmed through direct laryngoscopic visualization. This procedure involves examining the vocal cords and larynx using a special instrument called a laryngoscope. During this examination, the healthcare provider will look for the presence of vocal cord paralysis, which is a common feature of PVFD.