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[A clinical study of impedance graph in verifying tracheal intubation].
Zhonghua Yi Xue Za Zhi. 2007 Apr 03; 87(13):898-901.ZY

Abstract

OBJECTIVE

To evaluate the clinical usefulness of impedance pneumography in determining the tube placement during endotracheal intubation.

METHODS

Thirty-six endotracheally-intubated patients for elective operations underwent general anesthesia and endotracheal intubation, and then a second identical tube was inserted into the esophagus under laryngoscopic control. The ventilation circuit was then attached either to tracheal or esophageal tube. The tube position was determined by 2 blinded examiners, one experienced and the other inexperienced, using three methods: impedance pneumography, capnography, and auscultation. The order of the tubes tested and the order of the methods used were randomized. The observation results and the time needed to determine were recorded by another assistant.

RESULTS

Of the 216 tests conducted, both examiners correctly diagnosed the position of the tube using impedance pneumography and capnography. In the auscultation method there were two false-negative results (with the tracheal tube identified as esophageal) and one false-positive (with the esophageal tube identified as tracheal) by the experienced examiner, while five false-negative results (with the tracheal tube identified as esophageal) and nine false-positive (with the esophageal tube identified as tracheal) by the inexperienced examiner. With the sensitivity and specificity of impedance pneumography as standards (100%), the sensitivity and specificity of the capnography were both 100% too, and the sensitivity and specificity of the auscultation method were 90% and 86% respectively, both significantly lower than those of the other 2 methods (all P<0.01). Capnography needed 3.4 s+/-1.3 s and 3.7 s+/-1.4 s to verify tracheal intubation and esophageal intubation respectively, both significantly longer than those of the auscultation methods (1.7 s+/-0.7 s and 2.5 s+/-1.7 s) and impedance pneumography (1.6+/-0.3 and 2.1+/-1.1s, all P<0.01). It took less time for impedance pneumography and auscultation to verify the tracheal intubation than to verify esophageal intubation (both P<0.01).

CONCLUSION

Impedance pneumography is one of the reliable methods for diagnosing tracheal tube position.

Authors+Show Affiliations

Department of Anesthesiology, Zhongshan Hospital, Fudan University School of Medicine, Shanghai 200032, China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

English Abstract
Journal Article

Language

chi

PubMed ID

17650400

Citation

Yao, Yong-xing, et al. "[A Clinical Study of Impedance Graph in Verifying Tracheal Intubation]." Zhonghua Yi Xue Za Zhi, vol. 87, no. 13, 2007, pp. 898-901.
Yao YX, Jiang Z, Lu XH, et al. [A clinical study of impedance graph in verifying tracheal intubation]. Zhonghua Yi Xue Za Zhi. 2007;87(13):898-901.
Yao, Y. X., Jiang, Z., Lu, X. H., He, J. H., Ma, X. X., & Zhu, J. H. (2007). [A clinical study of impedance graph in verifying tracheal intubation]. Zhonghua Yi Xue Za Zhi, 87(13), 898-901.
Yao YX, et al. [A Clinical Study of Impedance Graph in Verifying Tracheal Intubation]. Zhonghua Yi Xue Za Zhi. 2007 Apr 3;87(13):898-901. PubMed PMID: 17650400.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - [A clinical study of impedance graph in verifying tracheal intubation]. AU - Yao,Yong-xing, AU - Jiang,Zhen, AU - Lu,Xia-hui, AU - He,Ji-hui, AU - Ma,Xiao-xu, AU - Zhu,Ji-hong, PY - 2007/7/26/pubmed PY - 2008/8/19/medline PY - 2007/7/26/entrez SP - 898 EP - 901 JF - Zhonghua yi xue za zhi JO - Zhonghua Yi Xue Za Zhi VL - 87 IS - 13 N2 - OBJECTIVE: To evaluate the clinical usefulness of impedance pneumography in determining the tube placement during endotracheal intubation. METHODS: Thirty-six endotracheally-intubated patients for elective operations underwent general anesthesia and endotracheal intubation, and then a second identical tube was inserted into the esophagus under laryngoscopic control. The ventilation circuit was then attached either to tracheal or esophageal tube. The tube position was determined by 2 blinded examiners, one experienced and the other inexperienced, using three methods: impedance pneumography, capnography, and auscultation. The order of the tubes tested and the order of the methods used were randomized. The observation results and the time needed to determine were recorded by another assistant. RESULTS: Of the 216 tests conducted, both examiners correctly diagnosed the position of the tube using impedance pneumography and capnography. In the auscultation method there were two false-negative results (with the tracheal tube identified as esophageal) and one false-positive (with the esophageal tube identified as tracheal) by the experienced examiner, while five false-negative results (with the tracheal tube identified as esophageal) and nine false-positive (with the esophageal tube identified as tracheal) by the inexperienced examiner. With the sensitivity and specificity of impedance pneumography as standards (100%), the sensitivity and specificity of the capnography were both 100% too, and the sensitivity and specificity of the auscultation method were 90% and 86% respectively, both significantly lower than those of the other 2 methods (all P<0.01). Capnography needed 3.4 s+/-1.3 s and 3.7 s+/-1.4 s to verify tracheal intubation and esophageal intubation respectively, both significantly longer than those of the auscultation methods (1.7 s+/-0.7 s and 2.5 s+/-1.7 s) and impedance pneumography (1.6+/-0.3 and 2.1+/-1.1s, all P<0.01). It took less time for impedance pneumography and auscultation to verify the tracheal intubation than to verify esophageal intubation (both P<0.01). CONCLUSION: Impedance pneumography is one of the reliable methods for diagnosing tracheal tube position. SN - 0376-2491 UR - https://www.unboundmedicine.com/medline/citation/17650400/[A_clinical_study_of_impedance_graph_in_verifying_tracheal_intubation]_ L2 - http://journal.yiigle.com/LinkIn.do?linkin_type=pubmed&amp;issn=0376-2491&amp;year=2007&amp;vol=87&amp;issue=13&amp;fpage=898 DB - PRIME DP - Unbound Medicine ER -