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Blockage of longitudinal flow in endolymphatic hydrops
1Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston 02114.
Summary
External shunt surgery for Meniere's disease may be ineffective. Histological studies reveal that 91% of temporal bones had blockages or internal shunts, hindering endolymphatic sac drainage.
Area of Science:
- Otolaryngology
- Pathology
- Neurosurgery
Background:
- Meniere's disease is characterized by endolymphatic hydrops.
- External shunt surgery aims to drain excess endolymph from the endolymphatic sac.
- The efficacy of external shunts may depend on the patency of endolymphatic pathways.
Purpose of the Study:
- To evaluate the anatomical patency of endolymphatic pathways in Meniere's disease.
- To determine the prevalence of blockages and internal shunts affecting endolymphatic flow.
- To assess the theoretical implications for external endolymphatic shunt surgery.
Main Methods:
- Histological examination of 46 temporal bones from patients with Meniere's disease.
- Assessment of blockages in endolymphatic ducts, sinuses, utricular ducts, saccular ducts, and ductus reuniens.
- Identification of internal fistulae between the saccule and perilymphatic space.
Main Results:
- Blockages in longitudinal endolymph flow pathways were observed in 42 out of 46 ears (91%).
- The ductus reuniens was the most frequently blocked pathway (59%).
- Internal shunts (fistulae) were found in 2 ears with open pathways.
Conclusions:
- The majority of Meniere's disease temporal bones exhibit anatomical abnormalities that could compromise external shunt surgery efficacy.
- Blockages and internal shunts suggest alternative mechanisms for fluid regulation or failure in endolymphatic hydrops.
- Findings question the routine application of external endolymphatic shunt procedures in Meniere's disease.