Ariane R Panzer1, Susan V Lynch1, Chaz Langelier2, Jason D Christie3, Kathryn McCauley1, Mary Nelson4,5, Christopher K Cheung4,5, Neal L Benowitz6,5, Mitchell J Cohen7,8, Carolyn S Calfee9,10,11,12. 1. 1 Division of Gastroenterology, Department of Medicine. 2. 2 Division of Infectious Diseases, Department of Medicine. 3. 3 Division of Pulmonary and Critical Care Medicine, Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania. 4. 4 Department of Surgery. 5. 5 Zuckerberg San Francisco General Hospital, San Francisco, California. 6. 6 Division of Clinical Pharmacology, Department of Medicine. 7. 7 Department of Surgery, Denver Health Medical Center, Denver, Colorado; and. 8. 8 Department of Surgery, University of Colorado, Aurora, Colorado. 9. 9 Division of Pulmonary and Critical Care Medicine, Department of Medicine. 10. 10 Department of Anesthesia. 11. 11 Cardiovascular Research Institute, and. 12. 12 Center for Tobacco Control Research and Education, University of California, San Francisco, San Francisco, California.
Abstract
RATIONALE: Cigarette smoking is associated with increased risk of acute respiratory distress syndrome (ARDS) in patients after severe trauma; however, the mechanisms underlying this association are unknown. OBJECTIVES: To determine whether cigarette smoking contributes to ARDS development after trauma by altering community composition of the lung microbiota. METHODS: We studied the lung microbiota of mechanically ventilated patients admitted to the ICU after severe blunt trauma. To do so, we used 16S ribosomal RNA gene amplicon sequencing of endotracheal aspirate samples obtained on ICU admission (n = 74) and at 48 hours after admission (n = 30). Cigarette smoke exposure (quantified using plasma cotinine), ARDS development, and other clinical parameters were correlated with lung microbiota composition. MEASUREMENTS AND MAIN RESULTS: Smoking status was significantly associated with lung bacterial community composition at ICU admission (P = 0.007 by permutational multivariate ANOVA [PERMANOVA]) and at 48 hours (P = 0.03 by PERMANOVA), as well as with significant enrichment of potential pathogens, including Streptococcus, Fusobacterium, Prevotella, Haemophilus, and Treponema. ARDS development was associated with lung community composition at 48 hours (P = 0.04 by PERMANOVA) and was characterized by relative enrichment of Enterobacteriaceae and of specific taxa enriched at baseline in smokers, including Prevotella and Fusobacterium. CONCLUSIONS: After severe blunt trauma, a history of smoking is related to lung microbiota composition, both at the time of ICU admission and at 48 hours. ARDS development is also correlated with respiratory microbial community structure at 48 hours and with taxa that are relatively enriched in smokers at ICU admission. The data derived from this pilot study suggest that smoking-related changes in the lung microbiota could be related to ARDS development after severe trauma.
RATIONALE: Cigarette smoking is associated with increased risk of acute respiratory distress syndrome (ARDS) in patients after severe trauma; however, the mechanisms underlying this association are unknown. OBJECTIVES: To determine whether cigarette smoking contributes to ARDS development after trauma by altering community composition of the lung microbiota. METHODS: We studied the lung microbiota of mechanically ventilated patients admitted to the ICU after severe blunt trauma. To do so, we used 16S ribosomal RNA gene amplicon sequencing of endotracheal aspirate samples obtained on ICU admission (n = 74) and at 48 hours after admission (n = 30). Cigarette smoke exposure (quantified using plasma cotinine), ARDS development, and other clinical parameters were correlated with lung microbiota composition. MEASUREMENTS AND MAIN RESULTS: Smoking status was significantly associated with lung bacterial community composition at ICU admission (P = 0.007 by permutational multivariate ANOVA [PERMANOVA]) and at 48 hours (P = 0.03 by PERMANOVA), as well as with significant enrichment of potential pathogens, including Streptococcus, Fusobacterium, Prevotella, Haemophilus, and Treponema. ARDS development was associated with lung community composition at 48 hours (P = 0.04 by PERMANOVA) and was characterized by relative enrichment of Enterobacteriaceae and of specific taxa enriched at baseline in smokers, including Prevotella and Fusobacterium. CONCLUSIONS: After severe blunt trauma, a history of smoking is related to lung microbiota composition, both at the time of ICU admission and at 48 hours. ARDS development is also correlated with respiratory microbial community structure at 48 hours and with taxa that are relatively enriched in smokers at ICU admission. The data derived from this pilot study suggest that smoking-related changes in the lung microbiota could be related to ARDS development after severe trauma.
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