Inhaled histamine increases the rate of absorption of sodium cromoglycate from the lung.

Abstract:

:Since many factors may alter lung epithelial permeability (LEP) to water soluble molecules, the effect of histamine on the absorption and clearance of inhaled sodium cromoglycate was examined in seven mildly asthmatic patients with hyperresponsive airways and eight normal subjects. The subjects underwent histamine challenge to determine the provocative concentration of histamine required to reduce the forced expiratory volume in one second (FEV1) by 20% (PC20) from baseline. On two further visits they inhaled either saline placebo or histamine and 5 min later inhaled an aerosol containing sodium cromoglycate. Measurements of FEV1 were made and blood samples taken for analysis of plasma sodium cromoglycate concentration at intervals for 3 h. In the asthmatic group histamine inhalation led to a 24 +/- 4% reduction in FEV1 but had no effect on the normal subjects. When compared with inhaled saline, histamine increased the initial pulmonary absorption of SCG without influencing the total amount of drug absorbed in both asthmatics and normals. These observations suggest that the pharmacokinetics of inhaled sodium cromoglycate may be altered significantly by inflammatory mediators present at the site of drug absorption from the airways.

journal_name

Br J Clin Pharmacol

authors

Richards R,Fowler C,Simpson S,Renwick AG,Holgate ST

doi

10.1111/j.1365-2125.1992.tb04048.x

keywords:

subject

Has Abstract

pub_date

1992-03-01 00:00:00

pages

337-41

issue

3

eissn

0306-5251

issn

1365-2125

journal_volume

33

pub_type

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