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Tolerance to the bronchoprotective effect of salmeterol 12 hours after starting twice daily treatment.
Ann Allergy Asthma Immunol. 1998 Jan; 80(1):31-4.AA

Abstract

BACKGROUND

Regular use of salmeterol has been associated with reduced bronchoprotective effect against methacholine as early as 24 hours after initiating treatment.

OBJECTIVE

To determine whether loss of the bronchoprotective effect measured one hour after salmeterol could be demonstrated 12 hours following one previous dose.

METHODS

Ten subjects with stable, mild asthma were enrolled in a randomized, placebo-controlled, double-blind, crossover study comparing two 2-dose treatment periods: (1) blinded salmeterol 50 microg inhaled at bedtime, followed by unblinded salmeterol 50 microg inhaled 12 hours later and (2) blinded placebo inhaled at bedtime, followed by unblinded salmeterol 50 microg inhaled 12 hours later. The methacholine PC20 was measured one hour after the morning salmeterol; FEV1 was measured just prior to the morning salmeterol dose and at the start of the methacholine inhalation test.

RESULTS

The mean log methacholine PC20 recorded one hour after a single dose of salmeterol (1.20 +/- 0.17 SE) was significantly higher than the mean log methacholine PC20 recorded after two doses of salmeterol at 12-hour intervals (1.00 +/- 0.16 SE; P = .024). The mean FEV1 12 hours after salmeterol was significantly higher than the mean FEV1 recorded 12 hours after placebo (P = .0017), however, there was no significant difference between the FEV1 recordings one hour after the two unblinded doses of salmeterol.

CONCLUSIONS

Tolerance to the bronchoprotective effect of salmeterol against methacholine induced bronchoconstriction occurs extremely quickly as it is evident 12 hours after starting twice daily treatment.

Authors+Show Affiliations

Department of Medicine, Royal University Hospital, Saskatoon, Canada.No affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

9475563

Citation

Drotar, D E., et al. "Tolerance to the Bronchoprotective Effect of Salmeterol 12 Hours After Starting Twice Daily Treatment." Annals of Allergy, Asthma & Immunology : Official Publication of the American College of Allergy, Asthma, & Immunology, vol. 80, no. 1, 1998, pp. 31-4.
Drotar DE, Davis EE, Cockcroft DW. Tolerance to the bronchoprotective effect of salmeterol 12 hours after starting twice daily treatment. Ann Allergy Asthma Immunol. 1998;80(1):31-4.
Drotar, D. E., Davis, E. E., & Cockcroft, D. W. (1998). Tolerance to the bronchoprotective effect of salmeterol 12 hours after starting twice daily treatment. Annals of Allergy, Asthma & Immunology : Official Publication of the American College of Allergy, Asthma, & Immunology, 80(1), 31-4.
Drotar DE, Davis EE, Cockcroft DW. Tolerance to the Bronchoprotective Effect of Salmeterol 12 Hours After Starting Twice Daily Treatment. Ann Allergy Asthma Immunol. 1998;80(1):31-4. PubMed PMID: 9475563.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Tolerance to the bronchoprotective effect of salmeterol 12 hours after starting twice daily treatment. AU - Drotar,D E, AU - Davis,E E, AU - Cockcroft,D W, PY - 1998/2/25/pubmed PY - 1998/2/25/medline PY - 1998/2/25/entrez SP - 31 EP - 4 JF - Annals of allergy, asthma & immunology : official publication of the American College of Allergy, Asthma, & Immunology JO - Ann Allergy Asthma Immunol VL - 80 IS - 1 N2 - BACKGROUND: Regular use of salmeterol has been associated with reduced bronchoprotective effect against methacholine as early as 24 hours after initiating treatment. OBJECTIVE: To determine whether loss of the bronchoprotective effect measured one hour after salmeterol could be demonstrated 12 hours following one previous dose. METHODS: Ten subjects with stable, mild asthma were enrolled in a randomized, placebo-controlled, double-blind, crossover study comparing two 2-dose treatment periods: (1) blinded salmeterol 50 microg inhaled at bedtime, followed by unblinded salmeterol 50 microg inhaled 12 hours later and (2) blinded placebo inhaled at bedtime, followed by unblinded salmeterol 50 microg inhaled 12 hours later. The methacholine PC20 was measured one hour after the morning salmeterol; FEV1 was measured just prior to the morning salmeterol dose and at the start of the methacholine inhalation test. RESULTS: The mean log methacholine PC20 recorded one hour after a single dose of salmeterol (1.20 +/- 0.17 SE) was significantly higher than the mean log methacholine PC20 recorded after two doses of salmeterol at 12-hour intervals (1.00 +/- 0.16 SE; P = .024). The mean FEV1 12 hours after salmeterol was significantly higher than the mean FEV1 recorded 12 hours after placebo (P = .0017), however, there was no significant difference between the FEV1 recordings one hour after the two unblinded doses of salmeterol. CONCLUSIONS: Tolerance to the bronchoprotective effect of salmeterol against methacholine induced bronchoconstriction occurs extremely quickly as it is evident 12 hours after starting twice daily treatment. SN - 1081-1206 UR - https://www.unboundmedicine.com/medline/citation/9475563/Tolerance_to_the_bronchoprotective_effect_of_salmeterol_12_hours_after_starting_twice_daily_treatment_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1081-1206(10)62935-3 DB - PRIME DP - Unbound Medicine ER -