Gastric regurgitation increases the risk of pulmonary aspiration in surgical patients receiving general anesthesia because of depression of gastro-esophageal reflux. In addition, some patients may have higher risk of aspiration as a result of reduced gastric emptying and gastroesophageal reflux, prolonged surgical time, and laparoscopic surgery. Second-generation supraglottic airway device (SAD) provides an additional channel to facilitate the drainage the gastric content to prevent from aspiration, which was routinely used in surgeries. Currently, multichannel intraluminal impedance-pH (MII-pH) monitoring, which combines multiple impedance channels to conventional pH catheters, is regarded as the most sensitive technique for detecting reflux events. Therefore, application of MII-pH monitoring on the SAD-based general anesthesia may help to detect ongoing reflux/regurgitation in the esophagus of patients during perioperative period. The hypothesis of the present study is that the occurrences of gastroesophageal regurgitation during general anesthesia may be influenced by the several factors, such as abdominal insufflation during laparoscopy, longer surgical time, Trendelenburg position, higher body weight, etc.
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episode of gastric regurgitation
Timeframe: From the insertion of supraglottic airway device until removal of supraglottic airway device, whichever came first, assessed up to the total anesthetic time.