Objective To explore the characteristics of high-resolution CT(HRCT)in asymptomatic small airway damage patients with different smoking levels.Methods 166 patients with pulmonary small airway damage admitted to our hospital from March 2022 to December 2023 were selected and divided into a non-smoking group(59 cases)and a smoking group(107 cases)based on whether they smoked.The smoking group was divided into low smoking group(51 cases,smoking<5 cigarettes per day)and high smoking group(56 cases,smoking≥5 cigarettes per day)based on smoking volume.All patients underwent end inspiratory and end expiratory HRCT scans,and the HRCT results were analyzed.Results The smoking group had higher inspiratory lung volume,expiratory lung volume,proportion of low attenuation areas in the inspiratory phase,and proportion of low attenuation areas in the expiratory phase compared to non-smoking group patients.The high smoking group had significantly higher inspiratory lung volume,expiratory lung volume,proportion of low attenuation areas in the inspiratory phase,and proportion of low attenuation areas in the exhalatory phase compared to the low smoking group,the differences were statistically significant(P<0.05).The incidence of lobular central emphysema,total lobular emphysema,pleural nodules and air trapping in the high smoking group were higher than those in the low smoking group and the non-smoking group.The incidence of lobular central air cavity nodules and subsegmental atelectasis in the high smoking group was higher than that in the non-smoking group.The incidence of centrilobular emphysema,total lobular emphysema,pleural nodules,air trapping,and centrilobular air nodules in the low smoking group was higher than that in the non-smoking group,the differences were statistically significant(P<0.05).Conclusion HRCT scans of asymptomatic pulmonary small airway damage patients who smoke show changes in lung volume parameters and lung lesions,and a large number of smoking patients have more severe lung lesions.
Pulmonary small airway damageHigh resolution CTSmokeLung volume parameters
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