Publications

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.

Background

Twelve percent of all acute liver failure (ALF) cases are of unknown origin, often termed indeterminate. A previously unrecognized hepatotropic virus has been suspected as a potential etiologic agent.

Methods

We compared the performance of metagenomic next-generation sequencing (mNGS) with confirmatory nucleic acid testing (NAT) to routine clinical diagnostic testing in detection of known or novel viruses associated with ALF. Serum samples from 204 adult ALF patients collected from 1998 to 2010 as part of a nationwide registry were analyzed. One hundred eighty-seven patients (92%) were classified as indeterminate, while the remaining 17 patients (8%) served as controls, with infections by either hepatitis A virus or hepatitis B virus (HBV), or a noninfectious cause for their ALF.

Results

Eight cases of infection from previously unrecognized viral pathogens were detected by mNGS (4 cases of herpes simplex virus type 1, including 1 case of coinfection with HBV, and 1 case each of HBV, parvovirus B19, cytomegalovirus, and human herpesvirus 7). Several missed dual or triple infections were also identified, and assembled viral genomes provided additional information on genotyping and drug resistance mutations. Importantly, no sequences corresponding to novel viruses were detected.

Conclusions

These results suggest that ALF patients should be screened for the presence of uncommon viruses and coinfections, and that most cases of indeterminate ALF in the United States do not appear to be caused by novel viral pathogens. In the future, mNGS testing may be useful for comprehensive diagnosis of viruses associated with ALF, or to exclude infectious etiologies.

OBJECTIVE

We compared rates of induced abortion among women veterans receiving Veterans Affairs (VA) healthcare to rates in the general US population, as current policy prohibits VA provision of abortion counseling or services even when pregnancy endangers a veteran's life.

METHODS

We analyzed data from 2298 women veterans younger than 45 years who completed a telephone-based, cross-sectional survey of randomly sampled English-speaking women from across the United States who had received VA healthcare. We compared lifetime, last-5-year and last-year rates of unintended pregnancy and abortion among participants to age-matched data from the National Survey of Family Growth. As few abortions were reported in the last year, we used multivariable logistic regression to examine associations between abortion in the last 5 years and age, race/ethnicity, income, education, religion, marital status, parity, geography, deployment history, housing instability, and past medical and mental health among VA patients.

RESULTS

Women veterans were more likely than matched US women to report ever having an abortion [17.7%, 95% confidence interval (CI): 16.1%-19.3% vs. 15.2% of US women]. In the last 5 years, unintended pregnancy and abortion were reported by veterans at rates similar to US women. In multivariable models, VA patients were more likely to report abortion in the last 5 years if their annual income was less than $40,000 (adjusted odds ratio (OR) 2.95, 95% CI 1.30-6.70), they had experienced homelessness or housing instability (adjusted OR 1.91, 95% CI 1.01-3.62), they were single (adj. OR 2.46, 95% CI 1.23-4.91) and/or they had given birth (adjusted OR 2.29, 95% CI 1.19-4.40).

CONCLUSION

Women veterans face unintended pregnancy and seek abortion as often as the larger US population.

IMPLICATIONS

The Veterans Health Care Act, which prohibits provision of abortion services, increases vulnerable veterans' out-of-pocket healthcare costs and limits veterans' reproductive freedom.