title: A comparison of levalbuterol with racemic albuterol in the treatment of acute severe asthma exacerbations in adults.
abstract: This multicenter, randomized, double-blind trial compared nebulized levalbuterol (Lev) and racemic albuterol (Rac) in the treatment of acute asthma.
  
  
  METHODS
  Adults with acute asthma exacerbations (FEV(1) 20%-55% predicted) received prednisone and either Lev (1.25 mg, n = 315) or Rac (2.5 mg, n = 312). Nebulized treatments were administered every 20 minutes in the first hour, then every 40 minutes for 3 additional doses, then as necessary for up to 24 hours. The primary end point was time to meet discharge criteria. Secondary end points included changes in lung function and hospitalization rates. A subset of 160 patients had plasma (S)-albuterol concentrations determined at study entry.
  
  
  RESULTS
  Time to meet discharge criteria did not differ between the 2 treatments. FEV(1) improvement was greater following Lev compared with Rac, both after dose 1 and cumulatively over the entire treatment period (dose 1 in intent to treat [ITT] group: Lev 0.50 +/- 0.43 L, Rac 0.43 +/- 0.37 L; P = .02), particularly among the 60% of patients not on recent steroid therapy (dose 1: Lev 0.58 +/- 0.47 L, Rac 0.44 +/- 0.37 L; P < .01), and patients whose entry (S)-albuterol concentrations were in the highest quartile of those measured. A small and similar proportion of Lev-treated (7.0%) and Rac-treated (9.3%) patients required hospitalization (P = .28). Among patients not on steroids, fewer Lev- than Rac-treated patients required admission (3.8% vs 9.3%, P = .03), as was also the case for patients with high plasma (S)-albuterol concentrations. Asthma relapses (5% in 30 days) were lower than in previous reports and did not differ between groups.
  
  
  CONCLUSIONS
  This study suggests that early, regular nebulized beta(2)-agonist and systemic corticosteroid therapy may reduce hospitalization and relapse rates in patients with acute severe asthma. Lev was well tolerated and compared favorably with Rac in improving airway function, particularly in those who were not on inhaled or oral corticosteroids and in those who had high plasma (S)-albuterol concentrations at presentation.
authors.affiliation: Department of Emergency Medicine, Henry Ford Hospital, Detroit, MI, USA.
authors.forename: Richard
authors.initials: R
authors.lastname: Nowak
authors.forename: Charles
authors.initials: C
authors.lastname: Emerman
authors.forename: John P
authors.initials: JP
authors.lastname: Hanrahan
authors.forename: Merdad V
authors.initials: MV
authors.lastname: Parsey
authors.forename: Nicola A
authors.initials: NA
authors.lastname: Hanania
authors.forename: Raymond
authors.initials: R
authors.lastname: Claus
authors.forename: Kendyl
authors.initials: K
authors.lastname: Schaefer
authors.forename: Rudolf A
authors.initials: RA
authors.lastname: Baumgartner
mesh_terms: D000208:Acute Disease; D000280:Administration, Inhalation; D000318:Adrenergic beta-Agonists / Q000627:therapeutic use*; D000328:Adult; D000420:Albuterol / Q000627:therapeutic use*; D000704:Analysis of Variance; D001249:Asthma / Q000188:drug therapy*; D001993:Bronchodilator Agents / Q000627:therapeutic use*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D009330:Nebulizers and Vaporizers; D011241:Prednisone / Q000627:therapeutic use; D011446:Prospective Studies; D012129:Respiratory Function Tests; D018709:Statistics, Nonparametric; D016896:Treatment Outcome
chemical_list: D000318:Adrenergic beta-Agonists; D001993:Bronchodilator Agents; D000420:Albuterol; D011241:Prednisone