Document Detail

Length of Nerve Gap Defects Correlates With Incidence of Nerve Regeneration But Not With Recovery of Taste Function in Patients With Severed Chorda Tympani Nerve.
MedLine Citation:
PMID:  21892118     Owner:  NLM     Status:  Publisher    
OBJECTIVE:: To evaluate the relationship between the length of nerve gap defects, incidence of nerve regeneration, and recovery of gustatory function after severing the chorda tympani nerve (CTN). STUDY DESIGN:: Retrospective study. SETTING:: University hospital. PATIENTS:: Eighty-eight consecutive patients whose CTNs were severed during primary surgery and who underwent secondary surgery were included. Proximal and distal stumps of severed nerves were readapted or approximated during surgery. INTERVENTION:: Therapeutic. MAIN OUTCOME MEASURES:: Before and after surgery, the taste function was periodically evaluated using electrogustometry. Nerve gaps were classified into 4 groups: readaptation (Group 1), 1 to 3 mm (Group 2), 4 to 6 mm (Group 3), and more than 7 mm (Group 4). RESULTS:: Regenerated nerves in the tympanic segment were detected in 36 (41%) of the 88 patients during secondary surgery. The incidence of nerve regeneration was 100% (10/10) in Group 1, 45% (10/22) in Group 2, 47% (9/19) in Group 3, and 19% (7/37) in Group 4. There was a significant difference between the length of nerve gap defects and incidence of nerve regeneration (p < 0.001). In the 36 patients with a regenerated CTN, the incidence of gustatory function recovery was 60% (6/10) in Group 1, 50% (5/10) in Group 2, 56% (5/9) in Group 3, and 43% (3/7) in Group 4. There was no significant difference between the length of nerve gap defects and incidence of taste function recovery. CONCLUSION:: Reconstruction of a severed CTN is very important for regeneration. However, the regenerated CTN in the tympanic segment does not always reinnervate the fungiform papillae.
Takehisa Saito; Norihiko Narita; Takechiyo Yamada; Kazuhiro Ogi; Masafumi Kanno; Yasuhiro Manabe; Tetsufumi Ito
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-9-1
Journal Detail:
Title:  Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology     Volume:  -     ISSN:  1537-4505     ISO Abbreviation:  -     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-9-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100961504     Medline TA:  Otol Neurotol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
*Department of Otolaryngology, Head and Neck Surgery, Faculty of Medicine, University of Fukui; †Research and Education Program for Life Science, University of Fukui, Fukui; ‡Department of Otolaryngology, Shinseikai Toyama Hospital, Toyama; and §Department of Anatomy, Faculty of Medicine, University of Fukui, Japan.
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