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Communication between the perilymphatic scalae and spiral ligament visualized by in vivo MRI

Jing Zou1, Ilmari Pyykkö, Börje Bjelke

  • 1Department of Otolaryngology, Tampere University Hospital, Tampere, Finland. Jing.Zou@uta.fi

Audiology & Neuro-Otology
|February 23, 2005
PubMed

Insights

Gadolinium-diethylenetriaminepentaacetate-bismethylamide (Gd-DTPA-BMA) effectively transports through the round window membrane into the inner ear. This MRI study shows Gd-DTPA-BMA reaches the cochlea and semicircular canals, aiding inner ear imaging.

Area of Science:

  • Oto-rhino-laryngology
  • Medical Imaging
  • Pharmacokinetics

Background:

  • Gadolinium-based contrast agents are crucial for MRI.
  • Understanding drug delivery to the inner ear is vital for treating hearing and balance disorders.
  • The round window membrane is a potential pathway for inner ear drug administration.

Purpose of the Study:

  • To evaluate the transport of Gadolinium-diethylenetriaminepentaacetate-bismethylamide (Gd-DTPA-BMA) across the round window (RW) membrane.
  • To assess the distribution of Gd-DTPA-BMA within the inner ear structures using MRI.
  • To compare Gd-DTPA-BMA transport via intact RW, perforated RW, and intravenous administration.

Main Methods:

  • Animal study using guinea pigs with 4.7-T MRI.
  • Human study using 1.5-T MRI.
  • Administration of Gd-DTPA-BMA onto intact and perforated RW membranes, and via intravenous injection.
  • Middle ear injection in human patients.

Main Results:

  • In guinea pigs, Gd-DTPA-BMA rapidly distributed to the basal and second turns of the cochlea, scala tympani, scala vestibuli, spiral ligament, and semicircular canal after intact RW administration.
  • Perforated RW and intravenous administration led to faster cochlear filling compared to intact RW.
  • In humans, Gd-DTPA-BMA was observed in the basal turn and semicircular canal within 2 hours after middle ear injection, with no apex uptake after 12 hours.
  • Gd-DTPA-BMA transport occurred via the RW to the semicircular canal, scala tympani, and scala vestibuli, bypassing the helicotrema.

Conclusions:

  • The round window membrane serves as an effective pathway for Gd-DTPA-BMA delivery to the perilymphatic space.
  • Gd-DTPA-BMA distribution is rapid and widespread within the basal and middle turns of the cochlea and adjacent structures.
  • This study supports the potential of RW administration for targeted inner ear drug delivery and imaging.

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