Prolonged blockade of Eustachian tube leads to ?

Ans. is'd'i.e., All of the above[Rf Dhingra 6h/e p. 60)Acute tubal blockage - AbsorPtion of ME gases - Negative Pressure in ME - Retraction of TM - Transudate in ME/haemorrhage (acute OME) - Prolonged tubal blockage/dysfunction - OME (thin watery or mucoid discharge) - Atelectatic ear/Perforation - Retraction pocket/cholesteatoma