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In a human, if you were to avoid a tympanotomy, how could you distinguish between a blocked Eustachian Tube, a ruptured eardrum, or Perilymph Fistula?

For instance take the situation where a young man (suffering from a common cold) blew his nose violently, became dizzy for 1 minute, and then reported loss of hearing in one ear of about 40%. What would your diagnosis be, possible treatments, and expected outcome?

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