Respiratory care
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Randomized Controlled Trial
Neurally-Adjusted Ventilatory Assist Versus Noninvasive Pressure Support Ventilation in COPD Exacerbation: The NAVA-NICE Trial.
This study was conducted to compare the effectiveness of noninvasive ventilation (NIV) with pressure support (NIV-PSV) to noninvasive neurally-adjusted ventilatory assist (NIV-NAVA) during COPD exacerbation. ⋯ Compared to NIV-PSV, NIV-NAVA was associated with better patient-ventilator synchrony and a reduction in the number of asynchrony events in subjects with an exacerbation of COPD, with similar effects on improvement in gas exchange, duration of NIV, hospital lenght of stay, and rate of NIV failure. (Clinicaltrials.gov registration NCT02912689.).
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Automatic cuff pressure (Pcuff) control devices for artificial airways are available, yet there are no standards or data to support their use. We hypothesized that airway pressure oscillations during mechanical ventilation are transmitted to Pcuff; and that the change in mean Pcuff (ΔPcuff) is zero during mechanical ventilation with controlled or uncontrolled Pcuff. ⋯ Automatic devices do not regulate ventilatory pressure oscillations, but they do control mean Pcuff and keep ΔPcuff well below a clinically important threshold. The large ΔPcuff seen with uncontrolled Pcuff warrants periodic monitoring. Further studies are needed to determine the source of ΔPcuff and the physiologic effects of Pcuff oscillations during mechanical ventilation.
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Clinical Trial
Oropharyngeal Oxygen Concentration Is Dependent on the Oxygen Mask System and Sampling Location.
Numerous oxygen delivery systems are used to treat hypoxemia. It is unknown if FIO2 at the lips predicts oropharyngeal FIO2 for various oxygen mask systems. We tested whether FIO2 measurements differed between the lips and oropharynx, and whether this difference depends on the mask system. ⋯ With high oxygen flows and normal tidal volume breathing, FIO2 measurements obtained at the oropharynx or at the lips depended on the device used, with the mask with diffuser showing the most significant discrepancies. FIO2 measures at the oropharynx and the lips were only consistent for the closed mask system. (ClinicalTrials.gov registration NCT02523586.).
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Review Meta Analysis
Immunonutrition for Adults With ARDS: Results From a Cochrane Systematic Review and Meta-Analysis.
ARDS is an overwhelming systemic inflammatory process associated with significant morbidity and mortality. Several trials have evaluated the effects of pharmaconutrients, given as part of a feeding formula or as a nutritional supplement, on clinical outcomes in critical illness and ARDS. The aim of this review is to assess the effects of immunonutrition on mechanically ventilated adults with ARDS compared to the standard feeding formula. ⋯ This Cochrane meta-analysis of 10 studies of varying quality examined the effects of omega-3 fatty acids and antioxidants in adults with ARDS. This intervention may produce little or no difference in all-cause mortality between groups. We are uncertain whether immunonutrition with omega-3 fatty acids and antioxidants improves ventilator days, ICU length of stay, or oxygenation due to the very low quality of evidence.