Palpatory thud, an audible snap is seen in

A foreign body in trachea may move up and down the trachea between the carnia and the undersurface of vocal cords causing "audible slap" and "palpatory thud&;.Symptoms and signs of foreign bodies at different levelsSite of foreign bodiesSymptoms and signsLarynxChoking, Cyanosis, Complete obstruction leading to death* Paial obstruction: stridor, hoarseness, cough, respiratory difficultyTrachea* Choking, stridor, wheeze, cough, palpatory thud, audible slap* Cough, wheeze and diminished air entry to lung forms a "triad"Bronchi Respiratory distress with swelling of the foreign body* Lung collapse, emphysema, pneumonitis, bronchiectasis or lung abscess are late featuresRef: Hazarika; 3rd ed; Pg 651