Improvement of exertional dyspnea and breathing pattern of inspiration to expiration after bronchial thermoplasty

Table 1 Changes in resting pulmonary function and forced oscillatory parameters after BT

	Pre-BT	3 months after BT	1 year after BT
Pulmonary function test
FEV₁, L	2.63	2.52	2.38
%FEV₁, % predicted	76.2	74.3	70.8
FEV₁/FVC, %	51.2	47.4	46.5
VC, L	5.10	5.21	5.17
IC, L	3.38	3.51	3.23
Forced oscillation technique
R5 ex, cmH₂O/L/s	3.83	3.65	2.42
R5 in, cmH₂O/L/s	1.96	2.12	1.66
R20 ex, cmH₂O/L/s	2.77	2.68	2.03
R20 in, cmH₂O/L/s	1.80	2.12	1.68
Fres ex, Hz	9.48	10.56	8.07
Fres in, Hz	7.41	8.67	7.19

BT bronchial thermoplasty, ex expiratory, FEV₁ forced expiratory volume in 1 s, Fres resonant frequency, FVC forced vital capacity, IC inspiratory capacity, in inspiratory, R5 the resistance at 5 Hz, R20 the resistance at 20 Hz, VC vital capacity

ISSN: 1710-1492