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• W3206481233 abstract "TOPIC: Critical Care TYPE: Original Investigations PURPOSE: Positive End Expiratory Pressure (PEEP) is a fundamental ventilator setting selected by critical care providers and is thought to mitigate atelectasis and atelectotrauma. Optimal PEEP is often studied in the setting of ARDS, but there have been few investigations on the selection of initial PEEP in its absence. Five cm H2O is believed to be a physiologic level and is often set as a standard starting point for intubated patients. We sought to explore if an initial use of PEEP≥7.5 cmH2O compared to lower initial levels of PEEP may reduce the incidence of Ventilator Associated Events (VAE). METHODS: We retrospectively reviewed charts of patients who received mechanical ventilation in 3 Intensive Care Units staffed by the same group of critical care providers. Consecutive cases were reviewed from September 2017 through September 2018. Exclusion criteria included a ventilator course of less than 3 calendar days, inpatient ventilation with alternate facilities or services prior to transfer, or the use of home ventilation prior to arrival. A total of 146 patients met inclusion criteria and data were recorded in a standardized format. Potential VAE were verified by the most senior reviewer using strict CDC criteria. Two cohorts were delineated, those who received an initial PEEP≥7.5 cmH2O and those initiated on <7.5 cmH2O. The initial PEEP was defined as the first setting that was sustained for a period of 8 hours. Fisher's Exact and Wilcoxon Rank Sum tests were used to assess for differences of dichotomous and nonparametric continuous variables, respectively. The primary outcome was the rate of VAE. Secondary outcomes included ICU and hospital mortality, ventilator days, and ICU and hospital days. Multivariate logistic regression analysis was performed to evaluate for any confounders noted in baseline characteristics. RESULTS: Of the 146 cases reviewed, 106 received higher initial PEEP and 40 received lower initial PEEP. Baseline characteristics between groups were similar, though an exception favoring the higher PEEP group was hypoxia as the reason for intubation (67% vs 35%, p=0.001). The cohort with PEEP≥7.5 had fewer VAE (9% vs 23%, p=0.04) and lower ICU mortality (48% vs 65%, p=0.02) compared to the lower PEEP cohort. Median number of ventilator days also trended towards significance in the former group (7 vs 11, p=0.07). Controlling for BMI and reason for intubation, PEEP≥7.5 independently reduced VAE 4-fold (OR 0.2, p=0.01) and ICU mortality 3-fold (OR 0.3, p=0.01). BMI≥30 also increased VAE 3-fold (OR 3.2, p=0.03) regardless of initial PEEP but had no effect on ICU mortality. CONCLUSIONS: The rates of VAE and ICU mortality were lower in patients who received an initial PEEP≥7.5 cmH2O compared to lower levels of initial PEEP. This observation was persistent after controlling for differences in baseline characteristics between groups. Obesity was an independent risk factor for VAE. A trend towards reduction of ventilator days was also seen among patients receiving higher levels of initial PEEP. CLINICAL IMPLICATIONS: Further study is needed on the subject of initial PEEP settings for intubated patients. DISCLOSURES: No relevant relationships by Alissa Ali, source=Web Response No relevant relationships by Jared Beaudin, source=Web Response No relevant relationships by Michael Colancecco, source=Web Response No relevant relationships by Yuxiu Lei, source=Web Response No relevant relationships by Alicia Logan, source=Web Response No relevant relationships by Joseph Plourde, source=Web Response No relevant relationships by Damini Saxena, source=Web Response No relevant relationships by Damini Saxena, source=Web Response" @default.
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• W3206481233 date "2021-10-01" @default.
• W3206481233 modified "2023-09-25" @default.
• W3206481233 title "INITIAL POSITIVE END EXPIRATORY PRESSURE (PEEP) SETTING FOR NEWLY VENTILATED PATIENTS: AN OFTEN OVERLOOKED DECISION THAT MAY IMPACT CLINICAL OUTCOMES" @default.
• W3206481233 doi "https://doi.org/10.1016/j.chest.2021.07.988" @default.
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