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• W2000405926 endingPage "S420" @default.
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• W2000405926 abstract "Objective: Our goal was to demonstrate explicitly that lower-frequency positive-pressure ventilation not only preserves adequate oxygenation and acid-base status in hemorrhagic states, but also that “normal” or higher respiratory rates significantly compromise hemodynamics, even with moderate degrees of hemorrhage. Design and Subjects: Eight intubated pigs (ventilated with 12 mL/kg tidal volume, 28% Fio2, respiratory rate = 12 breaths/min) were hemorrhaged to <65 mm Hg of systolic blood pressure. Respiratory rates were then sequentially changed every 10 mins to 6, 20, 30, and 6 breaths/min. Measurements and Main Results: With respiratory rates at 6 breaths/min, all subjects maintained pH of >7.25 and Sao2 of >99% while increasing systolic blood pressure (mean, 65–84 mm Hg; p < .05), time-averaged coronary perfusion pressure (50 ± 2 to 60 ± 4 mm Hg; p < .05), and cardiac output (2.4 to 2.8 L/min; p < .05). With respiratory rates of 20 and 30 breaths/min, systolic blood pressure (73 ± 4 and 66 ± 5 mm Hg, respectively), coronary perfusion pressure (47 ± 3 and 42 ± 4 mm Hg), and cardiac output (2.5 and 2.4 L/min) diminished. When returned to 6 breaths/min, systolic blood pressure (95 mm Hg), coronary perfusion pressure (71 + 6 mm Hg), and cardiac output (3.0 L/min) improved significantly (p < .05 for all comparisons). Conclusions: After moderate hemorrhage, animals maintain adequate oxygenation and acid-base status with lower-frequency respiratory rates, whereas increasingly higher respiratory rates progressively and significantly impair hemodynamics. Current ventilatory protocols for trauma resuscitation should be re-examined and considered a possible cause of worsened clinical outcomes and unrecognized confounded study results." @default.
• W2000405926 created "2016-06-24" @default.
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• W2000405926 date "2004-09-01" @default.
• W2000405926 modified "2023-09-25" @default.
• W2000405926 title "Detrimental hemodynamic effects of assisted ventilation in hemorrhagic states" @default.
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• W2000405926 doi "https://doi.org/10.1097/01.ccm.0000134264.88332.37" @default.
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