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Sunday 01 October 2000

The anti-inflammatory profile of inhaled corticosteroids combined with salmeterol in asthmatic patients.

By: Walters EH, Bjermer L, Faurschou P, Sandstrom T.

Respir Med 2000 Oct;94 Suppl F:S26-31

Inhaled corticosteroid (ICS) therapy such as fluticasone propionate (FP) is effective in moderate-to-severe asthma, but for patients on ICS who still experience symptoms, treatment guidelines recommend either increasing the dose of ICS or adding a long-acting beta2-agonist such as salmeterol or formoterol. Several studies have now shown that adding salmeterol provides greater clinical benefit than increasing the dose of ICS, raising the question of whether salmeterol has an additive or complementary anti-inflammatory effect to that of ICS. Recent studies on bronchial biopsies and bronchoalveolar lavage from asthmatic patients treated with either salmeterol. FP or placebo in addition to low-dose ICS have demonstrated that addition of salmeterol produces independent or additional reductions in several pro-inflammatory cells, cytokines and cell adhesion molecules compared with FP. Such complementary anti-inflammatory effects may explain the improved control of asthma symptoms and exacerbations observed when salmeterol is added to low-dose ICS therapy, and may help to modify the long-term sequelae of asthma. These findings also indicate, contrary to earlier speculation, that salmeterol does not have a pro-inflammatory effect or mask persistent airway inflammation. This review presents the results of recent studies and suggests possible mechanisms for the additional antiinflammatory effects of salmeterol.

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