KBN grant No. 2 P05C 052 27 (2004-2007)

Project Manager – Krzysztof Morawski MD, PhD


"The new model of intraoperative electrophysiological monitoring of hearing function in patients operated because of tumors of the cerebellopontine angle- clinical trials."


  • prof. Kazimierz Niemczyk,
  • Jorge Bohorquez PhD (University of Miami)
  • prof. Fred Telischi (University of Miami)

The issue of ponto-cerebellar angle tumors and is still an interdisciplinary challenge for surgeons, audiologists and radiologist. Better, more accurate and faster imaging and audiological diagnostic cause that more and more frequently in the surgical patient, status of hearing is relatively well preserved. Therefore, in addition to complete removal of the tumor, as a high priority at the time of surgery is to preserve the hearing function. Therefore, intraoperative monitoring of hearing function becomes particularly important. The purpose of intraoperative monitoring thus becomes a complex control of activity of cochlea, cochlear part of nerve VIII and the upper floors of the auditory pathway. One of the techniques allowing for the monitoring of hearing function is to record otoacoustic emissions, conducting electrophysiological measurements and testing cochlear blood flow. The authors of the project have experience in the field of intraoperative monitoring techniques that were mentioned earlier, gained both in animal models and in clinical trials, which are documented and supported by numerous publications.


The aim of this study was to develop a new model of electrophysiological intraoperative monitoring of hearing function in patients operated because of a cerebello-pontine angle tumor. The final result of the work is:


  1. Development of a program for the analysis of on-line type, which allows for very fast display of electrophysiological parameters recorded in real time
  2. Development of criteria and standards for each electrophysiological parameters recording useful in intraoperative monitoring that reflects the activity of the hearing organ,
  3. Standards have been developed that allow rapid interpretation of the obtained results, that show level and location of damage still in reverse phase, allowing the surgeon to modify handling and avoid causing irreparable damage to the hearing.