Two large clinical trials, the Serevent Nationwide Surveillance (SNS) trial7 and the Salmeterol Multicenter Asthma Research Trial (SMART),8 were designed to address whether regular use of the LABA salmeterol was associated with an increased risk of serious asthma events. At that time, inhaled glucocorticoids were not part of routine asthma care. Although the SNS trial showed significantly fewer withdrawals because of worsening asthma with salmeterol than with salbutamol, the rate of asthma-related deaths was higher among salmeterol-treated patients, although the difference was not significant.7 In SMART, more patients receiving salmeterol than receiving placebo died, both from respiratory-related events (24 vs. 11) and from asthma-related events (13 vs. 3).8 This risk was greater among black patients than among white patients.8 Although 47% of the patients were receiving inhaled glucocorticoids at baseline, SMART was not designed to address whether concurrent use of inhaled glucocorticoids altered the risk.8
Two large clinical trials, the Serevent Nationwide Surveillance (SNS) trial7 and the Salmeterol Multicenter Asthma Research Trial (SMART),8 were designed to address whether regular use of the LABA salmeterol was associated with an increased risk of serious asthma events. At that time, inhaled glucocorticoids were not part of routine asthma care. Although the SNS trial showed significantly fewer withdrawals because of worsening asthma with salmeterol than with salbutamol, the rate of asthma-related deaths was higher among salmeterol-treated patients, although the difference was not significant.7 In SMART, more patients receiving salmeterol than receiving placebo died, both from respiratory-related events (24 vs. 11) and from asthma-related events (13 vs. 3).8 This risk was greater among black patients than among white patients.8 Although 47% of the patients were receiving inhaled glucocorticoids at baseline, SMART was not designed to address whether concurrent use of inhaled glucocorticoids altered the risk.8
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