2002 Fiscal Year Final Research Report Summary
Experimental studies of prevention and therapy in intractable otitis media
| Project/Area Number |
13671793
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Otorhinolaryngology
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| Research Institution | Nagoya City University |
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Principal Investigator |
OZEKI Masashi Nagoya City University Graduate School of Medical Sciences Research Associate., 大学院・医学研究科, 助手 (80315887)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Motohiko Nagoya City University Graduate School of Medical Sciences Assistant Professor, 大学院・医学研究科, 講師 (50326138)
NAKAJIMA Katuhisa Nagoya City University Graduate School of Medical Sciences Professor, 大学院・医学研究科, 教授 (40012778)
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| Project Period (FY) |
2001 – 2002
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| Keywords | Intractable otitis media / recurrent otitis media / H. influenzae / Adenovirus / Eustachian tube |
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| Research Abstract |
Clinical signs and otoscopy
This increased level of inflammation was sustained for an additional 7days post-IN inoculation of NTHi, after which the mean tympanic membrane inflammation score increased to value of 2+ indicating moderate inflammation with an effusion present or suspected. This level of inflammation was maintained to day 14 after NTHi inoculation when the study was terminated.
Quantitation of adherent NTHi
The mean number of NTHi adherent to floor mucus at the pharyngeal portion of the ET was significantly greater 4 days after IN inoculation than at one day post inoculation. Adherence to pharyngeal floor mucus continued to increase slightly over the remaining 10 days of observation. At the mid and tympanic portions of the ET, the number of NTHi adherent to floor mucus increased more gradually, not reaching a maximum value until day 14.
NTHi adherence to roof mucus was significantly less than to floor mucus at all three portions of the ET on the days indicated. The number of NTHi adherent to cells of the mucosal epithelium in any portion (pharyngeal, mid, tympanic) or region (roof, floor) of the ET was negligible at all time points of this study.
NTHi adherence to middle ear mucosa was minimal until approximately 7-10 days after inoculation when there were also clinical signs of the onset of OM as determined by both otoscopy and tympanometry and delineated above. This increase in mean adherent bacteria was significantly between days : 4 and 7 ; and 7 and 10 days.
Electron microscopy
NTHi were found embedded in the mucus in the ET lumen and were not observed below the depth of the ciliary tips nor were they seen adherent to the surface of any epithelial cell type in any compartment of the ET
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