Quantitative analysis of tracheal damage
No reliable tool has been available thus far to quantitate tracheal damage indirectly immediately after endotracheal intubation. We chose hoarseness as an early indicator of tracheal damage and attempted to quantitate its measurement by using linear prediction analysis. Results were compared with th...
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Veröffentlicht in: | Critical care medicine 1983-04, Vol.11 (4), p.283-285 |
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Sprache: | eng |
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Zusammenfassung: | No reliable tool has been available thus far to quantitate tracheal damage indirectly immediately after endotracheal intubation. We chose hoarseness as an early indicator of tracheal damage and attempted to quantitate its measurement by using linear prediction analysis. Results were compared with those of a qualitative auditory test.Fourteen males who underwent general anesthesia were divided into 2 groups7 were intubated with high-pressure cuffed tubes, and the others with low-pressure cuffed tubes. Mean cuff pressure was 74.1 ± 2.87 mm Hg in the former (group A) and 15.4 ± 0.34 mm Hg in the latter (group B). All patients were asked to sound “a‘’ preoperatively, and on the 1st and 3rd postoperative days. This recorded sound was dubbed at random, transcribed, and scored by 12 physicians blindly following a 3-step scale (0normal, 1some hoarseness, 2obvious hoarseness). Scores were summed in each group and the totals for each postoperative day compared statistically to preoperative values by the Studentʼs t-test for paired data, with a significance of p < 0.05. Linear prediction analysis was applied to the speech sounds by computing the normalized energy of residue for each recorded sound at a sample interval of 64 msec. Total auditory scores between preoperative and first postoperative days were significantly different (p < 0.05) in group A but not in group B. Differences in normalized energy of residue measured preoperatively and first postoperatively were statistically significant (p < 0.05) in group A but not in group B. These results indicate that linear prediction of the speech wave can be a useful tool for quantitative, indirect analysis of hoarseness after endotracheal intubation. |
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ISSN: | 0090-3493 1530-0293 |
DOI: | 10.1097/00003246-198304000-00007 |