¸ñÀû: Vascular pulsatile tinnitus (VPT) has frequently been classified as
¡°objective tinnitus¡±, in most cases VPT is not objective because
VPT is not easily documentable in most cases. In this regard, we
have recently reported a novel transcanal sound recording and
spectro-temporal analysis method for the objective and differential
diagnosis of VPT. In this study, we applied the transcanal sound
recording and spectro-temporal analysis method for a verification of
postoperative VPT change. ¹æ¹ý:Transcanal sound recording was performed for five VPT patients before
and after operation. VPT was recorded with transcanal microphone in
eight different head positions.: 1) neutral head position, 2) head
rotated to the tinnitus side, 3) head rotated to the non-tinnitus
side, and 4) neutral position with manual compression of the
ipsilateral carotid artery, in both upright and supine positions. The
ear canal signals recorded from the patients were analyzed in the
time-frequency domain. °á°ú:From the spectro-temporal analysis, all five VPT patients demonstrated pulse-synchronous, mutually exclusive acoustic characteristics that were representative of their presumptive vascular pathologies such as sigmoid sinus diverticulum, dehiscent jugular bulb, dominant transverse-sigmoid sinus with high jugular bulb, or dural arteriovenous fistula. Postoperative recordings demonstrated decreased or disappeared recorded signals in all patients and they were consistent with subjective improvement of VPT after surgical interventions such as resurfacing of sigmoid sinus or jugular bulb, or transarterial embolization. °á·Ð:The transcanal recording and spectro-temporal analysis may be very
useful method not only to objectify VPT but also to verify treatment
outcome by comparing signals before and after operation. Future
studies with a larger sample size and diverse etiologies are
warranted. |