Chest
Original ResearchUltrasonographyDiaphragmatic Motion Studied by M-Mode Ultrasonography: Methods, Reproducibility, and Normal Values
Section snippets
Materials and Methods
The local ethics committee approved the study protocol, and written informed consent was obtained from all healthy subjects. All volunteers were free of any signs of cardio-respiratory and neurologic diseases, and had normal pulmonary function tests. Pulmonary function was studied with a spirometer (Ilmeter 1304; Masterlab Jaeger; Wurzberg, Germany) according to the standards of the American Thoracic Society. The criteria for classification as normal consisted of a FVC > 80% of predicted, a FEV1
Results
Initially, 236 healthy subjects were screened. However, 26 subjects had lower spirometric parameters than normal and were excluded. In total, 210 subjects (150 men, 60 women, 50 ± 14 years) were investigated (Table 1). Their pulmonary function tests were normal [FVC = 3.6 ± 1 (100 ± 13% of predicted), FEV1 = 3.1 ± 0.9 L (95 ± 11% of predicted), FEV1/FVC = 87 ± 7%].
Right and left diaphragmatic motions were successfully accomplished during QB in the whole population. Mean excursions were measured
Discussion
In the present study, the ultrasonographic recording of the right hemidiaphragmatic movement was found to be straightforward. Indeed, the liver window was large and allowed a good visualization of the right diaphragmatic dome. Consequently, the diaphragmatic motion of the right hemidiaphragm could be obtained during QB and VS in the whole population. Although complete motion could be assessed in most cases during DB, the descending lung masked the ultrasonographic images and impeded the
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The authors have no conflicts of interest to disclose.