title: Acute and chronic nitrendipine administration in essential hypertension: a chronobiologic study.
abstract: To evaluate the chronobiologic pattern of the hypotensive effect of nitrendipine, 10 patients with mild-to-moderate arterial hypertension were studied. They received a randomized single dose (20 mg) of nitrendipine and placebo, and 20 mg of nitrendipine daily for 2 months. Systolic and diastolic blood pressure (SBP and DBP, respectively) and heart rate (HR) were measured for 24 h using an automatic noninvasive device. The data were analyzed by single and mean cosinor methods and by ANOVA and Student's paired t test. Chronic administration of nitrendipine resulted in a more effective lowering of the SBP and DBP mesor, compared with placebo and acute administration, preserving the circadian rhythms. The preservation of the HR circadian rhythm agrees with the lack of interference of the drug with neurohormonal mechanisms.
authors.affiliation: Istituto di Medicina Interna, Università di Ferrara, Italy.
authors.forename: D
authors.initials: D
authors.lastname: Mele
authors.forename: R
authors.initials: R
authors.lastname: Manfredini
authors.forename: G
authors.initials: G
authors.lastname: Amadei
authors.forename: M
authors.initials: M
authors.lastname: Vaccari
authors.forename: P
authors.initials: P
authors.lastname: Sgobino
authors.forename: C
authors.initials: C
authors.lastname: Fersini
authors.forename: C
authors.initials: C
authors.lastname: Longhini
mesh_terms: D000328:Adult; D001794:Blood Pressure / Q000187:drug effects; D002909:Chronobiology Phenomena; D004334:Drug Administration Schedule; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D006973:Hypertension / Q000188:drug therapy*; D008297:Male; D008875:Middle Aged; D009568:Nitrendipine / Q000008:administration & dosage*
chemical_list: D009568:Nitrendipine