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Effects of ergometrine on airway smooth muscle contractile responses
Author(s) -
LOUIE S.,
KRZANOWSKI J. J.,
BUKANTZ S. C,
LOCKF.Y R. F.
Publication year - 1985
Publication title -
clinical and experimental allergy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.462
H-Index - 154
eISSN - 1365-2222
pISSN - 0954-7894
DOI - 10.1111/j.1365-2222.1985.tb02271.x
Subject(s) - ergometrine , contraction (grammar) , bronchospasm , medicine , acetylcholine , anesthesia , smooth muscle , muscle contraction , asthma
Summary 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 −9 m 10 −8 m ) induced contraction of canine tracheal smooth muscle. The concentration causing 50% of maximal contraction (EC 50 ) was 4.73 × 10 −8 M. The acetylcholine EC 50 was not altered by ergometrine (10 −9 M or 10 −8 M); however, acetylcholine (10 −4 m and 10 −3 m ) induced contractions were enhanced by ergometrine (10 −8 m ). The data suggest that ergometrine maleate may cause broncho‐constriction in some patients with asthma.