title: Metoclopramide-Induced Vascular Hyperreactivity: A Comparative Study Between Normotensive and Hypertensive Subjects.
abstract: In the present study, we have evaluated the cardiovascular responses to the cold pressor test (CPT) under intravenous metoclopramide (MTC) treatment (7.5 &mgr;g kg(minus sign1) min(minus sign1)) during a 30-min period and two additional periods, before and after MTC by using 5% glucose solution. There was a vascular hyperreactivity induced by MTC, Delta mm Hg was 21.4/24/1 mm Hg (systolic/diastolic blood pressure [BP]) during MTC versus Delta 17.2/17.9 mm Hg during 5% glucose infusion. In nine hypertensive subjects, Delta mm Hg was 36.8/25.7 during MTC versus Delta 31/24 mm Hg during 5% glucose. Bromocriptine pretreatment (7.5 mg daily for 7 days) antagonized MTC-BP increase during CPT. We conclude the following: (1) MTC induces a greater BP response during CPT which is blocked by using bromocriptine, a known DA(2) dopaminergic agonist. (2) A dopaminergic influence is present during CPT in normotensive and hypertensive subjects.
authors.affiliation: Clinical Pharmacology Unit, Division of Cardiology and Department of Pharmacology, Vargas Medical School, Caracas, Venezuela.
authors.forename: Mario
authors.initials: M
authors.lastname: Blanco
authors.forename: Ingrid
authors.initials: I
authors.lastname: Jelambi
authors.forename: Northan
authors.initials: N
authors.lastname: Hurtado
authors.forename: Manuel
authors.initials: M
authors.lastname: Velasco