title: Pharmacological study of the internal and sphincter in patients with chronic anal fissure.
abstract: A pharmacological study of the internal anal sphincter (IAS) was undertaken in patients with chronic and fissure. The sensitivity of the IAS to the contractile effect of phenylephrine and potassium chloride and to relaxation by isoproterenol was evaluated. Supersensitivity of the IAS to relaxation by isoproterenol was noted. Further research is necessary to determine the pharmacological basis of such a disturbance.
authors.affiliation: Department of Surgery, Federal University of Ceara, Brazil.
authors.forename: F S
authors.initials: FS
authors.lastname: Regadas
authors.forename: L K
authors.initials: LK
authors.lastname: Batista
authors.forename: J L
authors.initials: JL
authors.lastname: Albuquerque
authors.forename: F R
authors.initials: FR
authors.lastname: Capaz
mesh_terms: D001003:Anal Canal / Q000187:drug effects* / Q000503:physiopathology; D002908:Chronic Disease; D004305:Dose-Response Relationship, Drug; D005401:Fissure in Ano / Q000503:physiopathology*; D006801:Humans; D066298:In Vitro Techniques; D007545:Isoproterenol / Q000494:pharmacology*; D009119:Muscle Contraction / Q000187:drug effects; D010656:Phenylephrine / Q000494:pharmacology*; D011189:Potassium Chloride / Q000494:pharmacology*
chemical_list: D010656:Phenylephrine; D011189:Potassium Chloride; D007545:Isoproterenol