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Magnetic resonance imaging of guinea pig cochlea after vasopressin‐induced or surgically induced endolymphatic hydrops
- Source :
- Otolaryngology–Head and Neck Surgery. 142:260-265
- Publication Year :
- 2010
- Publisher :
- Wiley, 2010.
-
Abstract
- Objective To investigate the ability to detect the in vivo cochlear changes associated with vasopressin-induced and surgically induced endolymphatic hydrops using MRI at 3 tesla (T). Study Design Prospective, animal model. Setting Animal laboratory. Subjects and Methods In group 1, five guinea pigs underwent post–gadolinium temporal bone MRI before and after seven and 14 days of chronic systemic administration of vasopressin by osmotic pump. In group 2, five guinea pigs underwent temporal bone MRI eight weeks after unilateral surgical ablation of the endolymphatic sac. Three-tesla high-resolution T1-weighted sequences were acquired pre- and postcontrast administration. Region of interest signal intensities of the perilymph and endolymph were analyzed manually. Quantitative evaluation of hydrops was measured histologically. Results Gadolinium preferentially concentrated in the perilymph, allowing for distinction of cochlear compartments on 3.0-T MRI. The T1-weighted contrast MRI of vasopressin-induced hydropic cochlea showed significant increases in signal intensity of the endolymph and perilymph. Surgically induced unilateral hydropic cochlea also showed increased signal intensity, compared with the control cochlea of the same animal, but less of an increase than the vasopressin group. The histological degree of hydrops induced in the vasopressin group was comparable to previous studies. Conclusions In vivo postcontrast MRI of the inner ear demonstrated cochlear changes associated with chronic systemic administration of vasopressin and surgical ablation of the endolymphatic sac. Understanding the MRI appearance of endolymphatic hydrops induced by various methods contributes to the future use of MRI as a possible tool in the diagnosis and treatment of Meniere's disease.
- Subjects :
- Vasopressin
Pathology
medicine.medical_specialty
Vasopressins
Endolymph
Guinea Pigs
Contrast Media
Gadolinium
Endolymphatic sac
otorhinolaryngologic diseases
medicine
Animals
Vasoconstrictor Agents
Endolymphatic Hydrops
Inner ear
Prospective Studies
Endolymphatic hydrops
Endolymphatic Duct
Meniere Disease
Cochlea
medicine.diagnostic_test
business.industry
Magnetic resonance imaging
Perilymph
medicine.disease
Magnetic Resonance Imaging
Disease Models, Animal
medicine.anatomical_structure
Otorhinolaryngology
Surgery
sense organs
Endolymphatic Sac
business
Subjects
Details
- ISSN :
- 10976817 and 01945998
- Volume :
- 142
- Database :
- OpenAIRE
- Journal :
- Otolaryngology–Head and Neck Surgery
- Accession number :
- edsair.doi.dedup.....c2e1be46b4e461a82172470995721893