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• W1997500308 abstract "Study objective Although a moderate positive end-expiratory pressure (PEEP) level is widely recommended, it is unknown whether moderate PEEP during mechanical ventilation has adverse effects during severe hemorrhagic shock. Therefore, the purpose of our study was to evaluate the effects of 0 cm H2O PEEP versus 5 cm H2O PEEP versus 10 cm H2O PEEP on short-term survival in a porcine model of severe hemorrhagic shock. Secondary study endpoints were hemodynamic variables and blood gases. Methods Twenty-four anesthetized pigs were bled approximately 45 mL/kg, randomized into 3 groups, and then ventilated with 0, 5, or 10 cm H2O PEEP. Survival rates were compared using Kaplan-Meier methods with log rank (Mantel Cox) comparison of cumulative survival by treatment group. Results Seven of 8 0 cm H2O PEEP animals survived the 120-minute study period, but 8 of 8 5 cm H2O PEEP animals died within 30 minutes, and 8 of 8 10 cm H2O PEEP animals were dead within 20 minutes (P<.0001). Ventilation with 0 cm H2O PEEP prevented a further reduction of mean arterial blood pressure and cardiac output. When compared with the 0 cm H2O PEEP group, end-tidal CO2 declined in the 5 cm H2O PEEP and 10 cm H2O PEEP animals. Compared with the 0 cm H2O PEEP animals, those ventilated with 5 or 10 cm H2O PEEP had higher lactate levels after 10 minutes. Conclusion When compared with pigs ventilated with either 5 or 10 cm H2O PEEP, those ventilated with 0 cm H2O PEEP during untreated, severe hemorrhagic shock had significantly improved short-term survival. Although a moderate positive end-expiratory pressure (PEEP) level is widely recommended, it is unknown whether moderate PEEP during mechanical ventilation has adverse effects during severe hemorrhagic shock. Therefore, the purpose of our study was to evaluate the effects of 0 cm H2O PEEP versus 5 cm H2O PEEP versus 10 cm H2O PEEP on short-term survival in a porcine model of severe hemorrhagic shock. Secondary study endpoints were hemodynamic variables and blood gases. Twenty-four anesthetized pigs were bled approximately 45 mL/kg, randomized into 3 groups, and then ventilated with 0, 5, or 10 cm H2O PEEP. Survival rates were compared using Kaplan-Meier methods with log rank (Mantel Cox) comparison of cumulative survival by treatment group. Seven of 8 0 cm H2O PEEP animals survived the 120-minute study period, but 8 of 8 5 cm H2O PEEP animals died within 30 minutes, and 8 of 8 10 cm H2O PEEP animals were dead within 20 minutes (P<.0001). Ventilation with 0 cm H2O PEEP prevented a further reduction of mean arterial blood pressure and cardiac output. When compared with the 0 cm H2O PEEP group, end-tidal CO2 declined in the 5 cm H2O PEEP and 10 cm H2O PEEP animals. Compared with the 0 cm H2O PEEP animals, those ventilated with 5 or 10 cm H2O PEEP had higher lactate levels after 10 minutes. When compared with pigs ventilated with either 5 or 10 cm H2O PEEP, those ventilated with 0 cm H2O PEEP during untreated, severe hemorrhagic shock had significantly improved short-term survival." @default.
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• W1997500308 date "2005-10-01" @default.
• W1997500308 modified "2023-10-10" @default.
• W1997500308 title "Influence of Positive End-Expiratory Pressure Ventilation on Survival During Severe Hemorrhagic Shock" @default.
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• W1997500308 doi "https://doi.org/10.1016/j.annemergmed.2005.02.022" @default.
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