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ImportanceWhether selective decontamination of the digestive tract (SDD) reduces mortality in critically ill patients remains uncertain.ObjectiveTo determine whether SDD reduces in-hospital mortality in critically ill adults.Design, Setting, and ParticipantsA cluster, crossover, randomized clinical trial that recruited 5982 mechanically ventilated adults from 19 intensive care units (ICUs) in Australia between April 2018 and May 2021 (final follow-up, August 2021). A contemporaneous ecological assessment recruited 8599 patients from participating ICUs between May 2017 and August 2021.InterventionsICUs were randomly assigned to adopt or not adopt a SDD strategy for 2 alternating 12-month periods, separated by a 3-month interperiod gap. Patients in the SDD group (n = 2791) received a 6-hourly application of an oral paste and administration of a gastric suspension containing colistin, tobramycin, and nystatin for the duration of mechanical ventilation, plus a 4-day course of an intravenous antibiotic with a suitable antimicrobial spectrum. Patients in the control group (n = 3191) received standard care.Main Outcomes and MeasuresThe primary outcome was in-hospital mortality within 90 days. There were 8 secondary outcomes, including the proportion of patients with new positive blood cultures, antibiotic-resistant organisms (AROs), and Clostridioides difficile infections. For the ecological assessment, a noninferiority margin of 2% was prespecified for 3 outcomes including new cultures of AROs.ResultsOf 5982 patients (mean age, 58.3 years; 36.8% women) enrolled from 19 ICUs, all patients completed the trial. There were 753/2791 (27.0%) and 928/3191 (29.1%) in-hospital deaths in the SDD and standard care groups, respectively (mean difference, −1.7% [95% CI, −4.8% to 1.3%]; odds ratio, 0.91 [95% CI, 0.82-1.02]; P = .12). Of 8 prespecified secondary outcomes, 6 showed no significant differences. In the SDD vs standard care groups, 23.1% vs 34.6% had new ARO cultures (absolute difference, −11.0%; 95% CI, −14.7% to −7.3%), 5.6% vs 8.1% had new positive blood cultures (absolute difference, −1.95%; 95% CI, −3.5% to −0.4%), and 0.5% vs 0.9% had new C difficile infections (absolute difference, −0.24%; 95% CI, −0.6% to 0.1%). In 8599 patients enrolled in the ecological assessment, use of SDD was not shown to be noninferior with regard to the change in the proportion of patients who developed new AROs (−3.3% vs −1.59%; mean difference, −1.71% [1-sided 97.5% CI, −∞ to 4.31%] and 0.88% vs 0.55%; mean difference, −0.32% [1-sided 97.5% CI, −∞ to 5.47%]) in the first and second periods, respectively.Conclusions and RelevanceAmong critically ill patients receiving mechanical ventilation, SDD, compared with standard care without SDD, did not significantly reduce in-hospital mortality. However, the confidence interval around the effect estimate includes a clinically important benefit.Trial RegistrationClinicalTrials.gov Identifier: NCT02389036

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Carbon-coated nanoparticles of NiRu (NiRu@C) have been synthesized by a high-pressure chemical vapor deposition using metallocenes of both metals. Transmission electron microscopy images show an average particle size (core) of 8 ± 3 nm and carbon shell thicknesses between 2 and 3 nm. X-ray diffraction investigation reveals NiRu binary alloys. Analyses of the X-ray diffraction peaks and the magnetization curves approximately confirm the average particle size. The compositions of the nanoalloy cores have been studied by means of energy dispersive X-ray analysis. We find that at constant sublimation temperature (95 °C) a synthesis temperature of 900 °C and a Ni−Ru-metallocene weight ratio of 2:1, an increase of synthesis pressure leads to both a change of the core composition and the thickness of the carbon coatings. The magnetic properties of the coated nanoalloys strongly depend on the synthesis parameters so that, for example, the superparamagnetic blocking temperature and the saturation magnetization can be tailored. Our straightforward of controlled synthesis therefore opens a novel route to complex nanosized functional materials.