Baydur A, Behrakis P K, Zin W A, Jaeger M, Milic-Emili J
Am Rev Respir Dis. 1982 Nov;126(5):788-91. doi: 10.1164/arrd.1982.126.5.788.
The validity of the conventional esophageal balloon technique as a measure of pleural pressure was tested in 10 subjects in sitting, supine, and lateral positions by occluding the airways at end-expiration and measuring the ratio of changes in esophageal (delta Pes) and mouth pressure (delta Pm) during the ensuing spontaneous occluded inspiratory efforts. Similar measurements were also made during static Mueller maneuvers. In both tests, delta Pes/delta Pm values were close to unity in sitting and lateral positions, whereas in the supine position, substantial deviations from unity were found in some instances. However, by repositioning the balloon to different levels in the esophagus, even in these instances a locus could be found where the delta Pes/delta Pm ratio was close to unity. No appreciable phase difference between delta Pes and delta Pm was found. We conclude that by positioning the balloon according to the "occlusion test" procedure, valid measurements of pleural pressure can be obtained in all the tested body positions.
通过在呼气末阻塞气道，并在随后的自发性阻塞吸气努力过程中测量食管压力变化（ΔPes）与口腔压力变化（ΔPm）的比值，在10名受试者的坐位、仰卧位和侧卧位测试了传统食管气囊技术作为胸膜压力测量方法的有效性。在静态米勒动作期间也进行了类似的测量。在两项测试中，坐位和侧卧位的ΔPes/ΔPm值均接近1，而在仰卧位，在某些情况下发现与1有显著偏差。然而，通过将气囊重新定位到食管的不同水平，即使在这些情况下，也能找到一个ΔPes/ΔPm比值接近1的位置。未发现ΔPes和ΔPm之间有明显的相位差。我们得出结论，通过根据“阻塞试验”程序定位气囊，在所有测试的体位中都能获得有效的胸膜压力测量值。
