搏动性耳鸣与颞骨蜂房气化程度关系的体外实验研究

Objective: To study the relationship between pulsatile tinnitus and temporal bone pneumatization grade. Methods: Through the in vitro experiment, the generation and transmission pathways of the venous sound were simulated. The sound signals at the position of eardrum were recorded and analyzed. Results: In case of cortical plate dehiscence, the high pressure and pulse-synchronous venous sounds were received at eardrum. The highest sound pressure occurred in the normal pneumatization case. In case of cortical plate intactness, the non-pulsatile venous sounds with pressure close to the background control sound were received at eardrum. Temporal bone air cells (TBAC) with different pneumatization grades would transmit venous sound in different frequency ranges. Conclusions: Normal pneumatization TBAC exhibited the highest amplification on venous sound, while hypopneumatization TBAC exhibited the lowest amplification on venous sound. The pneumatization grade of TBAC is neither the sufficient nor essential condition of pathogenic venous sound, while the cortical plate dehiscence is the sufficient or necessary condition of pathogenic venous sound.