Muller's maneuver is ?

Ans. is 'd' i.e., Reverse of Valsalva's maneuver Muller's maneuvre : - A flexible endoscope is passed through the nose and the patient asked to inspire vigrously with nose and mouth completely closed. Look for collapse of the soft tissues at the level of base of tongue and just above the soft palate. Level of pharyngeal obstruction can be found. In Valsalva's maneuver the person expires vigrously with nose and mouth closed completely. So, Muller's maneuver is opposite to Valsalva's maneuver.