title: Effect of naloxone on circadian rhythms in lung function.
abstract: To determine whether the endogenous opioid peptides play a part in the pathogenesis of asthmatic morning dipping, six patients with chronic asthma with a reproducible peak flow pattern of morning dipping were investigated in a double blind, randomised, crossover study of naloxone versus placebo. Naloxone was given as a loading dose of 8 mg followed by a continuous infusion of 5.6 mg/h from midnight until 10 am on two consecutive nights. Naloxone had no significant effect on PEFR, FEV1, or FVC at 6 am. There was, however, an improvement over placebo values in all these indices between the hours of 8 am and 8 pm on the day after the first naloxone infusion in all six patients. This effect was not observed after the second naloxone infusion.
mesh_terms: D000293:Adolescent; D000328:Adult; D001249:Asthma / Q000188:drug therapy* / Q000503:physiopathology; D002908:Chronic Disease; D002940:Circadian Rhythm / Q000187:drug effects*; D002986:Clinical Trials as Topic; D005260:Female; D005541:Forced Expiratory Volume; D006801:Humans; D008168:Lung / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009270:Naloxone / Q000627:therapeutic use*; D010366:Peak Expiratory Flow Rate; D012119:Respiration / Q000187:drug effects*; D014797:Vital Capacity
chemical_list: D009270:Naloxone