No abstract available
MeSH terms
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Aged
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Anesthesia
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Aorta, Thoracic / surgery
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Cardiac Surgical Procedures
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Echocardiography, Transesophageal
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Humans
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Hypoxia / etiology*
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Male
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Oxygen / blood
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Pneumonia / complications*
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Positive-Pressure Respiration
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Valsalva Maneuver