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DOI: 10.1055/s-0039-1678047
Risk of a severe exacerbation following higher reliever use: post-hoc analysis of SYGMA 1 in mild asthma
Publication History
Publication Date:
19 February 2019 (online)
Introduction In mild asthma, as-needed budesonide/formoterol (BUD/FORM) reduces long-term severe exacerbation risk vs. terbutaline as-needed, with similar reduction as maintenance BUD + terbutaline as-needed. In a post-hoc analysis of SYGMA 1 (NCT02149199; OʼByrne et al. NEJM 2018;378(20):1865 – 1876) we examined the short-term risk of a severe exacerbation after a single day with various levels of reliever use, comparing terbutaline as-needed, BUD/FORM as-needed, and maintenance BUD + terbutaline as-needed.
Methods In the SYGMA 1 study, 3836 patients with mild asthma were randomised to placebo twice daily (bid) + terbutaline 0.5 mg as-needed, placebo bid + BUD/FORM 200/6 µg as-needed, or maintenance BUD 200 µg bid + terbutaline as-needed. For patients with > 2, > 4, > 6 or > 8 reliever inhalations on any day, the proportions who had a severe exacerbation during the next 21 days were compared.
Results The proportion of patients with > 4, > 6 or > 8 as-needed inhalation use days was lower with BUD/FORM as-needed vs. terbutaline as-needed and maintenance BUD + terbutaline as-needed, with reduced risk of severe exacerbation during the next 21 days vs. terbutaline as-needed ([Fig. 1]; [Table 1]). The safety of BUD/FORM as-needed was consistent across all inhalation groups, with no new safety findings.


As-needed terbutaline 0.5 mg (n = 1277) |
As-needed BUD/FORM 200/6 µg (n = 1277) |
BUD maintenance 200 µg bid + as-needed terbutaline (n = 1282) |
|
---|---|---|---|
* Hazard ratios not calculated in view of low exacerbation rates in the as-needed BUD/FORM group. |
|||
> 2 “as-needed” inhalations |
|||
Patients with > 2 reliever inhalations on ≥ 1day, n (%) |
936 (73.3) |
850 (66.6) |
758 (59.1) |
Patients with severe exacerbations within 21 days, n (%) |
37 (4.0) |
10 (1.2) |
11 (1.5) |
Hazard ratio (95% CI) |
Reference group |
0.30 (0.15, 0.61) p = 0.001 |
0.37 (0.19, 0.73) p = 0.004 |
3.33 (1.65, 6.69) p = 0.001 |
Reference group |
1.24 (0.53, 2.91) p = 0.63 |
|
> 4 “as-needed” inhalations |
|||
Patients with > 4 reliever inhalations on ≥ 1day, n (%) |
526 (41.2) |
303 (23.7) |
311 (24.3) |
Patients with severe exacerbations within 21 days, n (%) |
40 (7.6) |
5 (1.7) |
9 (2.9) |
Hazard ratio (95% CI) |
Reference group |
0.24 (0.09, 0.60) p = 0.002 |
0.41 (0.20, 0.84) p = 0.015 |
4.24 (1.67, 10.75) p = 0.002 |
Reference group |
1.73 (0.58, 5.15) p = 0.328 |
|
> 6 “as-needed” inhalations |
|||
Patients with > 6 reliever inhalations on ≥ 1day, n (%) |
281 (22.0) |
102 (8.0) |
142 (11.1) |
Patients with severe exacerbations within 21 days, n (%) |
22 (7.8) |
1 (1.0) |
6 (4.2) |
Hazard ratio (95% CI) |
Reference group |
– |
0.61 (0.25, 1.51) p = 0.287 |
> 8 “as-needed” inhalations* |
|||
Patients with > 8 reliever inhalations on ≥ 1day, n (%) |
170 (13.3) |
49 (3.8) |
67 (5.2) |
Patients with severe exacerbations within 21 days, n (%) |
15 (8.8) |
0 (0.0) |
2 (3.0) |
Conclusions In mild asthma, anti-inflammatory reliever therapy with BUD/FORM as-needed reduces higher reliever use days and reduces exacerbations within the next 21 days vs. terbutaline as-needed.