The effect of dipyridamole on histamine- and adenosine-induced bronchoconstriction in normal and asthmatic subjects

Eur J Respir Dis. 1985 Sep;67(3):185-92.

Abstract

The effect of intravenous infusion of dipyridamole on histamine- and adenosine-induced bronchoconstriction was studied in 6 normal and 6 allergic asthmatic subjects. Dipyridamole in a single dose of 50 mg over 50 min had no effect upon baseline airway calibre measured as specific airways conductance (sGaw) and the forced expiratory volume in 1 s (FEV1). In the asthmatic subjects adenosine-induced bronchoconstriction was potentiated to a small extent by dipyridamole as indicated by a decrease in the concentration of adenosine required to produce falls from baseline of 40% for sGaw (PCs40) and 20% for FEV (PCf20) from 0.48 mg/ml to 0.32 and 0.37 mg/ml respectively. Dipyridamole had a small protective effect on histamine-induced bronchoconstriction with PCs40 and PCf20 increasing from 0.08 mg/ml to 0.11 and 0.17 mg/ml. In normal subjects dipyridamole failed to reveal a bronchoconstrictor effect of adenosine. These studies demonstrate the complex interaction between dipyridamole and bronchoconstrictor stimuli on the airways.

MeSH terms

  • Adenosine / administration & dosage
  • Adenosine / adverse effects*
  • Administration, Intranasal
  • Adult
  • Asthma / physiopathology*
  • Bronchi / physiopathology*
  • Dipyridamole / administration & dosage
  • Dipyridamole / pharmacology*
  • Female
  • Histamine / administration & dosage
  • Histamine / adverse effects*
  • Humans
  • Infusions, Parenteral
  • Male
  • Middle Aged

Substances

  • Dipyridamole
  • Histamine
  • Adenosine