title: Effects of intravenous administration of slow-reacting substance of anaphylaxis, histamine, bradykinin, and prostaglandin F2alpha on pulmonary mechanics in the guinea pig.
abstract: The effects of intravenous administration of a purified preparation of slow-reacting substance of anaphylaxis (SRS-A), histamine, bradykinin, and prostaglandin F(2alpha) (PGF(2alpha)) on the mechanics of respiration were assessed in the unanesthetized guinea pig. Geometrically increasing doses of SRS-A resulted in graded decreases in average pulmonary compliance, with only modest increases in average pulmonary resistance. A dose with apparent maximal effects. 3,000 U/kg, resulted in a decrease of 49+/-7% of compliance below control values, with an increase in resistance of 24+/-8% above control. Intravenous administration of geometrically increasing amounts of histamine, bradykinin, and prostaglandin F(2alpha) also resulted in decreased compliance; but in each case this was accompanied by a marked increase in respiratory resistance. A decrease of compliance of approximately 50%, induced by intravenous histamine, bradykinin, or PGF(2alpha), was accompanied by an increase of 60-140% in resistance. Thus, intravenously administered SRS-A alters pulmonary mechanics with a more peripheral effect than any of the other agents tested.
mesh_terms: D000403:Airway Resistance / Q000187:drug effects; D000818:Animals; D001920:Bradykinin / Q000008:administration & dosage* / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D006168:Guinea Pigs; D006632:Histamine / Q000008:administration & dosage* / Q000494:pharmacology; D007263:Infusions, Parenteral; D008168:Lung / Q000187:drug effects*; D008170:Lung Compliance / Q000187:drug effects; D008297:Male; D011453:Prostaglandins / Q000008:administration & dosage* / Q000494:pharmacology; D012119:Respiration / Q000187:drug effects; D013189:SRS-A / Q000008:administration & dosage* / Q000494:pharmacology; D013997:Time Factors
chemical_list: D011453:Prostaglandins; D013189:SRS-A; D006632:Histamine; D001920:Bradykinin