Silent aspiration of oral bacteria in elderly patients

Ayako Hasegawa, Takuichi Sato, Yasushi Hoshikawa, Takashi Kondo, Nobuhiro Takahashi

Research output: Chapter in Book/Report/Conference proceedingChapter


This study aimed to quantify and identify bacteria existing in intraoperative bronchial fluids (IBF), and evaluate the relationship between cough and/or swallowing reflexes (CSR) impairment and silent aspiration of oral bacteria (SAOB) in elderly patients. The bacterial amounts in IBF of patients with impaired CSR were higher than those with normal CSR. Predominant isolates from IBF with normal CSR were Streptococcus, Porphyromonas, Olsenella, Gemella and Veillonella, while those with impaired CSR were Streptococcus, Veillonella, Eikenella and Prevotella. These results indicate that IBF contains bacteria, probably derived from the oral microbiota, and suggest that SAOB occurs in elderly patients irrespective of impairment of CSR.

Original languageEnglish
Title of host publicationInterface Oral Health Science 2011
PublisherSpringer Japan
Number of pages2
ISBN (Electronic)9784431540700
ISBN (Print)9784431540694
Publication statusPublished - 01-01-2012
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Dentistry(all)

Cite this

Hasegawa, A., Sato, T., Hoshikawa, Y., Kondo, T., & Takahashi, N. (2012). Silent aspiration of oral bacteria in elderly patients. In Interface Oral Health Science 2011 (pp. 181-182). Springer Japan.