Effect of bronchial thermoplasty on air trapping assessed by xenon ventilation computed tomography

Ryota Dokuni, Kazuyuki Kobayashi, Yoshiharu Ohno, Tatsuya Nagano, Daisuke Tamura, Kanoko Umezawa, Naoko Katsurada, Kyosuke Nakata, Masatsugu Yamamoto, Motoko Tachihara, Hiroshi Kamiryo, Yoshihiro Nishimura

Research output: Contribution to journalArticlepeer-review


Objective Bronchial thermoplasty (BT) is a bronchoscopic procedure for patients with severe asthma. Although it has been suggested that BT works by reducing airway smooth muscle, the detailed mechanism underlying its effects is still unknown. Methods We performed xenon ventilation computed tomography (Xe-CT) before each BT procedure and six weeks after the third treatment to assess the improvement in lung ventilation at each separate lung region. The air trapping index in each lobe was defined as the mean trapping value (0: none, 1: mild, 2: moderate, and 3: severe) of the included segments. Patients and Materials Four patients were included. Results Asthma symptoms were improved after BT. The comparison of the scores at baseline with those after the third treatment showed that the air trapping index was improved in both the treated and untreated regions. However, neither the pulmonary function nor the exhaled nitric oxide was improved. Conclusion Using Xe-CT, we successfully evaluated the air trapping in patients who underwent BT. The improvement in asthma symptoms by BT may be related to the amelioration of peripheral lung ventilation in both the treated and untreated regions.

Original languageEnglish
Pages (from-to)2027-2032
Number of pages6
JournalInternal Medicine
Issue number13
Publication statusPublished - 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Internal Medicine


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