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- W2079306886 abstract "The understanding of the physiology and management of one-lung ventilation (OLV) has advanced over the last two decades. OLV induces an obligatory shunt through the nonventilated lung that causes varying degrees of arterial hypoxemia. Shunt may also occur in the venti lated lung. The optimal mode of ventilation of the dependent lung has not been well defined. The optimal tidal volume, respiratory rate, inspired oxygen concen tration, and positive end-expiratory pressure (PEEP) during OLV are not known. Functional residual capacity (FRC) of the ventilated lung can be lower than during two-lung ventilation, causing atelectasis and arterial hypoxemia. Patients who desaturate might be expected to show improvement in oxygenation with dependent lung PEEP, because of increased FRC and reduced V/Q mismatch. Not all patients have low lung volumes, and not all patients who have low lung volumes will desatu rate. Therefore, prophylactic PEEP is not usually neces sary or appropriate. Because the predominant cause of hypoxemia during OLV is shunt in the nondependent lung, therapies to improve arterial oxygenation during OLV should be primarily directed toward the nondepen dent lung. Partial reinflation of the nondependent lung with O 2 will reduce the physiological shunt fraction of the lung. Continuous positive airways pressure (CPAP) is an effective prophylactic and therapeutic treatment for hypoxemia. All studies examining CPAP have found it to be effective, provided it is preceded by lung reinflation." @default.
- W2079306886 created "2016-06-24" @default.
- W2079306886 creator A5060733458 @default.
- W2079306886 creator A5088899338 @default.
- W2079306886 date "1997-09-01" @default.
- W2079306886 modified "2023-09-27" @default.
- W2079306886 title "Physiology of One-Lung Ventilation" @default.
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