Abstract
Background
The coexistence of emphysema and pulmonary fibrosis is known as combined pulmonary fibrosis and emphysema (CPFE). The aim of this study was to compare diaphragmatic motion measured by M-mode ultrasonography of patients with CPFE, idiopathic pulmonary fibrosis (IPF), and chronic obstructive pulmonary disease (COPD).
Methods
Pulmonary function, high-resolution computed tomography (HRCT), and diaphragmatic motion were examined in patients with CPFE (n = 25), IPF (n = 18), and COPD (n = 60), and in healthy controls (n = 21). Diaphragmatic motions were measured on M-mode ultrasonographic images during quiet breathing and deep breathing.
Results
There were no significant differences in right or left diaphragmatic motion during quiet breathing among the four groups, whereas differences were significant in right and left motion during deep breathing. Diaphragmatic motion in CPFE patients was the lowest among the four groups. COPD patients, especially those with severe COPD, showed significantly lower diaphragmatic motion than IPF patients or healthy controls. There were no differences in diaphragmatic motion between IPF patients and healthy controls. Right diaphragmatic motions during deep breathing were negatively correlated with emphysema scores (r = −0.606, p < 0.001), but were not correlated with fibrosis scores on HRCT.
Conclusions
Diaphragmatic weakness was found in CPFE patients. Emphysema but not fibrosis may be one cause of limited diaphragmatic motion in patients with CPFE. M-mode ultrasonographic evaluation of diaphragmatic motion during deep breathing may be a useful tool in diagnosing CPFE and in discriminating CPFE patients from IPF or COPD patients.
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Acknowledgments
This work was supported by grants from the National Natural Science Foundation of China (No. 30500224) and Science and Technology Bureau of Jingzhou, Hubei, China (No. [2009]13).
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The authors have no conflicts of interest or financial ties to disclose.
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Li He and Wanguang Zhang contributed equally to this work.
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He, L., Zhang, W., Zhang, J. et al. Diaphragmatic Motion Studied by M-mode Ultrasonography in Combined Pulmonary Fibrosis and Emphysema. Lung 192, 553–561 (2014). https://doi.org/10.1007/s00408-014-9594-5
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DOI: https://doi.org/10.1007/s00408-014-9594-5