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The effect of different positions of injector catheter tip on carbon dioxide elimination during high-conventional frequency jet ventilation |
ZHOU Yamei1, LIU Le2, CHEN Limei2, XU Xuzhong2. |
1.Department of Anesthesiology, the Fifth Affiliated Hospital of Wenzhou Medical University, Lishui Municipal Central Hospital, Lishui, 323000; 2.Department of Anesthesiology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015
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Cite this article: |
ZHOU Yamei,LIU Le,CHEN Limei, et al. The effect of different positions of injector catheter tip on carbon dioxide elimination during high-conventional frequency jet ventilation [J]. JOURNAL OF WEZHOU MEDICAL UNIVERSITY, 2017, 47(1): 37-41.
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Abstract Objective: To compare the effect of carbon dioxide elimination during high-conventional frequency jet ventilation with different injector positions in trachea. Methods: Twenty patients undergoing scheduled surgery were selected in this study, with exclusion of thoracic or laparoscopic surgery. High-conventional frequency jet ventilation was applied after general anesthesia. The study objects were randomly divided into two groups named group A and group B by crossover design. In group A, the injection catheter tip was first placed in the endotracheal tube about 3 cm above carina for 40 minutes applying high-conventional frequency jet ventilation, then the injection catheter tip was placed proximal to vocal cord level for another 40 minutes for the same. After that, IPPV was carried out to the end of the surgery. In group B, the only difference is that the injection catheter tip placement sequence was opposite to group A. PETCO2, PIP, MAP, HR, SpO2 and the results of blood gas analysis were recorded at three defined time points including the time before jet ventilation (T0), 20 minutes after jet ventilation (T1), 40 minutes after jet ventilation (T2). Results: The value of PETCO2 at T2 and T1 was significantly higher than that at T0 (P<0.05), and the value at T2 was significantly higher than that at T1 (P<0.05) when the injector head was placed about 3 cm above carina. While the value of PETCO2 at T2 and T1 was significantly lower than that at T0 (P<0.05) when the injector tip was located proximal to the vocal cord level. Placement sequences of injection catheter tip in these two groups made no statistical differences in values of d-PaCO2 (P>0.05), d-PaO2 (P>0.05), d-PH (P>0.05), d-HCO3- (P>0.05). However, there were significant differences in d-PaCO2
(P<0.01), d-PH (P<0.01), d-HCO3- (P<0.01). Conclusion: It is easier to eliminate carbon dioxide in blood when the injector tip was located proximal to the vocal cord level than that was placed about 3 cm above carina where the level of carbon dioxide in blood increased during the high-conventional frequency jet ventilation.
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Received: 25 April 2016
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