医学
电阻抗断层成像
肺
灌注
通风(建筑)
心脏病学
麻醉
核医学
内科学
断层摄影术
放射科
机械工程
工程类
作者
Inéz Frerichs,Sven Pulletz,Gunnar Elke,Florian Reifferscheid,Dirk Schädler,Jens Scholz,Norbert Weiler
出处
期刊:Respiration
[S. Karger AG]
日期:2009-01-01
卷期号:77 (3): 282-291
被引量:86
摘要
<i>Background:</i> Electrical impedance tomography (EIT) is able to detect variations in regional lung electrical impedance associated with changes in both air and blood content and potentially capable of assessing regional ventilation-perfusion relationships. However, regional lung perfusion is difficult to determine because the impedance changes synchronous with the heart rate are of very small amplitude. <i>Objectives:</i> The aim of our study was to determine the redistribution of lung perfusion elicited by one-lung ventilation using EIT with a novel region-of-interest analysis. <i>Methods:</i> Ten patients (65 ± 9 years, mean age ± SD) scheduled for elective chest surgery were studied after intubation with a double-lumen endotracheal tube during bilateral and unilateral ventilation of the right and left lungs. EIT data were acquired at a rate of 25 scans/s. Relative impedance changes synchronous with the heart rate were evaluated in the right and left lung regions. <i>Results:</i> During bilateral ventilation, the mean right-to-left lung ratio of the sum of heart rate-related impedance changes was 1.12 ± 0.20, but the ratio significantly changed (0.81 ± 0.16 and 1.48 ± 0.37) during unilateral left- and right-lung ventilation with reduced perfusion of the non-ventilated lung. Increased perfusion most likely occurred in the ventilated lung because the impedance values summed over both regions did not change (0.62 ± 0.23 vs. 0.58 ± 0.22) compared with bilateral ventilation. <i>Conclusions:</i> Our results indicate that redistribution of regional lung perfusion can be assessed by EIT during one-lung ventilation. The performance of EIT in detecting changes in lung perfusion in even smaller lung regions remains to be established.
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