Association between pathogens from tracheal aspirate and oral biofilm of patients on mechanical ventilation

Abstract The aim of this study was to detect possible associations between respiratory pathogens from tracheal aspirate and oral biofilm samples in intubated patients in an intensive care unit (ICU), and to identify the most common respiratory pathogens in oral biofilm, particularly in patients that developed ventilator-associated pneumonia (VAP). Two oral biofilm samples were collected from the tongue of intubated patients (at admission and after 48 hours) and analyzed by culture with the Antibiotic Sensitivity Test. The results from the tongue biofilm samples were compared with the tracheal secretions samples. A total of 59.37% of patients exhibited the same species of pathogens in their tracheal aspirate and oral biofilm, of which 8 (42.1%) developed VAP, 10 (52.63%) did not develop pneumonia and one (5.26%) had aspiration pneumonia. There was a statistically significant association between presence of microorganisms in the tracheal and mouth samples for the following pathogens: Klebsiella pneumoniae, Candida albicans, Pseudomonas aeruginosa, Enterobacter gergoviae, Streptococcus spp and Serratia marcescens (p < 0.05). Pathogens that are present in tracheal aspirates of intubated patients can be detected in their oral cavity, especially in those who developed VAP or aspiration pneumonia. Thus, the results indicate that an improved oral care in these patients could decrease ICU pneumonia rates.

Neumonía aspirativa en pacientes adultos mayores / Aspiration pneumonia in the elderly patients

En la neumonía aspirativa hay evidencia radiológica de infiltrado parenquimal pulmonar en diferentes segmentos, como consecuencia del paso de secreciones contaminadas por agentes patógenos que proceden de la región orofaríngea o gastroesofágica hacia el árbol traqueobronquial. Se presenta principalmente en adultos mayores y en pacientes con alteraciones neurodegenerativas. Los mecanismos implicados en la aspiración son: la disfagia orofaríngea funcional y las alteraciones gastroesofágicas. Los gérmenes implicados son Streptococcus pneumoniae, Haemophilus influenza y S. aureus cuando la neumonía aspirativa ocurre en la comunidad y bacilos gramnegativos si es de ocurrencia intrahospitalaria. Los anaerobios pocas veces son agentes responsables. La historia clínica, radiografía pulmonar y otros procedimientos como la videofluroscopia orofaríngea, resultan útiles para el diagnóstico. El tratamiento está basado en el uso de antibióticos principalmente contra gérmenes aeróbicos grampositivos y gramnegativos y, excepcionalmente, contra anaerobios en situaciones especiales; y, medidas para disminuir las condiciones que favorecen la broncoaspiración.

In aspiration pneumonia there is radiological evidence of an infiltrate in the pulmonary parenchyma, in different segments, as a result of the passage of secretions contaminated by pathogens that come from the region of oropharyngeal or gastroesophageal tube to the tracheobronchial tree. It occurs mainly in the elderly and in patients with neurodegenerative disorders. The involved mechanisms in the aspiration are: functional oropharyngeal dysphagia and gastroesophageal alterations. The involved germs are Streptococcus pneumoniae, Haemophilus influenza and Staphylococcus aureus when the aspiration pneumonia occurs in the community and gram-negative bacilli in hospital occurrence. Anaerobic bacteria are rarely responsible agents. The clinical history, pulmonary x-ray and other procedures such as oropharyngeal videofluoroscopy are useful for diagnosis. Treatment is mainly based on the use of antibiotics against gram-positive and gram-negative aerobic germs and, exceptionally, against anaerobes in special situations; and, measures to reduce the conditions that favor the aspiration into lungs.

Aeromonas hydrophila and Aspiration Pneumonia: A Diverse Presentation

Although there are ever increasing reports of extraintestinal human infections caused by Aeromonads, in both immunocompromised and immunocompetent patients, respiratory tract infections remain uncommon. We describe a case of aspiration pneumonia in an immunocompetent patient with multiple sclerosis, caused by a community acquired, multidrug resistant strain of Aeromonas hydrophila sensitive only to meropenem. The case highlights the clinical significance of Aeromonas hydrophila as a respiratory pathogen, as well as the community origin of multidrug resistance and the utility of newer carbapenems in such cases.