Accuracy of CO 2 monitoring via nasal cannulas and oral bite blocks during sedation for esophagogastroduodenoscopy
Journal of clinical monitoring and computing(2015)
摘要
Esophagogastroduodenoscopy procedures are typically performed under conscious sedation. Drug-induced respiratory depression is a major cause of serious adverse effects during sedation. Capnographic monitoring of respiratory activity improves patient safety during procedural sedation. This bench study compares the performance of the nasal cannulas and oral bite blocks used to monitor exhaled CO 2 during sedation. We used a spontaneously breathing mechanical lung to evaluated four CO 2 sampling nasal cannulas and three CO 2 sampling bite blocks. We placed pneumatic resistors in the mouth of the manikin to simulate different levels of mouth opening. We compared CO 2 measurements taken from the sampling device to CO 2 measurements taken directly from the trachea. The end tidal CO 2 concentration (P et CO 2 ) measured through the bite blocks and nasal cannulas was always lower than the corresponding P et CO 2 measured at the trachea. The difference became larger as the amount of oxygen delivered through the devices increased. The difference was larger during normal ventilation than during hypoventilation. The difference became larger as the amount of oral breathing increased. The two nasal cannulas without oral cups failed to provide sufficient CO 2 for breath detection when the mouth was fully open and oxygen was delivered at 10 L/min. Our simulation found that respiratory rate can be accurately monitored during the procedure using a CO 2 sampling bite block or a nasal cannula with oral cup. The accuracy of P et CO 2 measurements depends on the device used, the amount of supplement oxygen, the amount of oral breathing and the patient’s minute ventilation.
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关键词
Conscious sedation, End-tidal carbon dioxide, Esophagogastroduodenoscopy, Manikin
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