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Esophageal . Manometry. A nasogastric tube equipped with an esophageal balloon was used for this study (Avea GS smarthCath; Carefusion, Yorba Linda, CA). Correct positioning of the esophageal catheter was ensured with an occlusion test(3). After inflating the catheter according to manufacturer recommendations, during a prolonged expiratory hold ... ................
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