<prompt> Muller manoeuvre is used in?To find out opening of mouthTo remove laryngeal foreign bodyTo find degree of obstruction in sleep disordered breathingTo remove foreign body from ear  <response>: Mullers manoeuvre: A flexible endoscope is passed through the nose and the patient asked to inspire vigorously with nose and mouth completely closed. Look for the collapse of the soft tissues at the level of the base of the tongue and just above the soft palate. Level of pharyngeal obstruction can be found. Ref: Diseases of ENT, PL Dhingra, 7th edition, pg no. 315 