RESUMO
Eustachian tubal function was studied in 50 patients having perforated ear drums by doing valsalva manoeuvre, Bortnick-Miller [B.M.] apparatus and contrast roentgenographic evaluation [prograde technique] were done. The ventilatory function of the Eustachian tube was severely compromised in traumatic perforation cases [50%]. The use of traumatic perforation cases as control in future investigations has been put to question. The ventilatory function of the Eustachian tubes in CSOM was found to be less efficient as compared to controls. However, a wide spectrum of functions ranging from normal to complete absence of function was found in these cases. A comparison between B.M. Test and contrast evaluation demonstrated a false positive result of 26.8% in the later test as far as ventilatory function was concerned. It was thus inferred that B.M. Test and contrast evaluation demonstrated a false positive result of 26.8% in the later test as far as ventilatory function was concerned. It was thus inferred that B.M. test should be used as screening procedure for testing ventilatory n of Eustachian tube. The severely hypo-functioning and non-functioning a tubes should be subjected to contrast evaluation to delineate the site and probable use of obstruction