Table 1. Inclusion criteria in studies into bronchial thermoplasty
Feasibility study [9]AIR study [6]RISA study [5]AIR2 study [7]
Age years≥1818–6518–6518–65
ICS dose# μg≤1500 or 200–1800≥200>1500>1000
LABA dose μg0–100≥100≥100≥100
OCS dose mg·day−100≤30≤10
Pre-BD FEV1 % predicted60–8560–85≥50≥60

  • AIR: Asthma Intervention Research; RISA: Research in Severe Asthma; ICS: inhaled corticosteroids; LABA: long-acting β2-agonist; OCS: oral corticosteroids; BD: bronchodilator; FEV1: forced expiratory volume in 1 s. #: beclomethasone dipropionate equivalent; : inclusion criteria different at the two participating sites (Narinder Shargill, Boston Scientific, San Jose, CA, USA; personal communication).