Effects of ergometrine on airway smooth muscle contractile responses
Article first published online: 27 APR 2006
Clinical & Experimental Allergy
Volume 15, Issue 2, pages 173–178, March 1985
How to Cite
LOUIE, S., KRZANOWSKI, J. J., BUKANTZ, S. C. and LOCKF.Y, R. F. (1985), Effects of ergometrine on airway smooth muscle contractile responses. Clinical & Experimental Allergy, 15: 173–178. doi: 10.1111/j.1365-2222.1985.tb02271.x
- Issue published online: 27 APR 2006
- Article first published online: 27 APR 2006
- (Received 24 July 1984: accepted for publication 23. August 1984)
A 26-year-old asthmatic female developed severe asthma within a few hours of receiving three oral doses of 0.4 mg ergometrine maleate for the control of postpartum haemorrhaging. This experience and two previous reports of bronchospasm in asthmatic subjects following ergometrine suggested that ergometrine altered airway smooth muscle tone.
In the present investigation the effect of ergometrine was studied on canine tracheal smooth muscle strips. Ergometrine (10−9m 10 −8m) induced contraction of canine tracheal smooth muscle. The concentration causing 50% of maximal contraction (EC50) was 4.73 × 10−8M. The acetylcholine EC50 was not altered by ergometrine (10−9M or 10−8M); however, acetylcholine (10 −4m and 10−3m) induced contractions were enhanced by ergometrine (10−8m). The data suggest that ergometrine maleate may cause broncho-constriction in some patients with asthma.