Abstract
Objective
To comprehensively assess the impact of aging, cigarette smoking, and chronic obstructive pulmonary disease (COPD) on pulmonary physiology using 129Xe MR.
Methods
A total of 90 subjects were categorized into four groups, including healthy young (HY, n = 20), age-matched control (AMC, n = 20), asymptomatic smokers (AS, n = 28), and COPD patients (n = 22). 129Xe MR was utilized to obtain pulmonary physiological parameters, including ventilation defect percent (VDP), alveolar sleeve depth (h), apparent diffusion coefficient (ADC), total septal wall thickness (d), and ratio of xenon signal from red blood cells and interstitial tissue/plasma (RBC/TP).
Results
Significant differences were found in the measured VDP (p = 0.035), h (p = 0.003), and RBC/TP (p = 0.003) between the HY and AMC groups. Compared with the AMC group, higher VDP (p = 0.020) and d (p = 0.048) were found in the AS group; higher VDP (p < 0.001), d (p < 0.001) and ADC (p < 0.001), and lower h (p < 0.001) and RBC/TP (p < 0.001) were found in the COPD group. Moreover, significant differences were also found in the measured VDP (p < 0.001), h (p < 0.001), ADC (p < 0.001), d (p = 0.008), and RBC/TP (p = 0.032) between the AS and COPD groups.
Conclusion
Our findings indicate that pulmonary structure and functional changes caused by aging, cigarette smoking, and COPD are various, and show a progressive deterioration with the accumulation of these risk factors, including cigarette smoking and COPD.
Clinical relevance statement
Pathophysiological changes can be difficult to comprehensively understand due to limitations in common techniques and multifactorial etiologies. 129Xe MRI can demonstrate structural and functional changes caused by several common factors and can be used to better understand patients’ underlying pathology.
Key Points
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Standard techniques for assessing pathophysiological lung function changes, spirometry, and chest CT come with limitations.
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129Xe MR demonstrated progressive deterioration with accumulation of the investigated risk factors, without these limitations.
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129Xe MR can assess lung changes related to these risk factors to stage and evaluate the etiology of the disease.
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Abbreviations
- ADC:
-
Apparent diffusion coefficient
- AMC:
-
Age-matched control
- AS:
-
Asymptomatic smokers
- COPD:
-
Chronic obstructive pulmonary disease
- CSSR:
-
Chemical shift saturation recovery
- CT:
-
Computed tomography
- d:
-
Total septal wall thickness
- DWI:
-
Diffusion‐weighted imaging
- FEV1 :
-
Forced expiratory volume in the first second
- FRC:
-
Functional residual capacity
- FVC:
-
Forced vital capacity
- h:
-
Alveolar sleeve depth
- Hct:
-
Blood hematocrit
- HP:
-
Hyperpolarized
- HY:
-
Healthy young
- Lm :
-
Mean airspace chord length
- PFTs:
-
Pulmonary function tests
- RBC:
-
Red blood cell
- RBC/TP:
-
Ratio of xenon signal from red blood cells and interstitial tissue/plasma
- TP:
-
Tissue/plasma
- VDP:
-
Ventilation defects percent
- δ:
-
Barrier thickness
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Funding
This work is supported by National key Research and Development Program of China (grant no. 2018YFA0704000, 2022YFC2410000), National Natural Science Foundation of China (grant no. 82127802, 21921004, 82372150, 81930049, 82202119), the Strategic Priority Research Program of the Chinese Academy of Sciences (grant No. XDB0540000), Key Research Program of Frontier Sciences, CAS (grant no. ZDBS-LY-JSC004), Hubei Provincial Key Technology Foundation of China(2021ACA013, 2023BAA021) and Hubei Provincial Outstanding Youth Fund (2023AFA112). Haidong Li and Xiuchao Zhao acknowledge the support from Youth Innovation Promotion Association, CAS (grant no. 2020330, 2021330).
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The scientific guarantor of this publication is Xin Zhou.
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The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.
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No complex statistical methods were necessary for this paper.
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Written informed consent was obtained from all subjects (patients) in this study.
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This study was performed under the approval of the Institutional Review Board at Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences. Ethical code: APMH22005A.
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Rao, Q., Li, H., Zhou, Q. et al. Assessment of pulmonary physiological changes caused by aging, cigarette smoking, and COPD with hyperpolarized 129Xe magnetic resonance. Eur Radiol (2024). https://doi.org/10.1007/s00330-024-10800-w
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DOI: https://doi.org/10.1007/s00330-024-10800-w