Acute effects of sumatriptan on aortic blood pressure, stiffness, and pressure waveform.

Background And Objectives: Sumatriptan, a 5-hydroxytryptamine (HT)(1B/1D) receptor agonist, is an effective acute antimigraine drug. Because of its vasoconstrictor activity, it is contraindicated in patients at high risk for adverse cardiovascular events. Acute antimigraine drugs without vasoconstrictor effects are currently being developed, and sensitive, noninvasive techniques by which to detect drug-induced vascular effects would facilitate their clinical development.

Calcitonin gene-related peptide-induced vasodilation in the human forearm is antagonized by CGRP8-37: evaluation of a human in vivo pharmacodynamic model.

Objectives: The aims of this study were to assess the potential of CGRP8-37, the C-terminal fragment of calcitonin gene-related peptide (CGRP), to inhibit CGRP-induced vasodilation in the human forearm and to evaluate a pharmacodynamic model to aid the clinical development of novel CGRP-receptor antagonists.

Methods: Forearm blood flow (FBF) responses to intra-arterial CGRP infusions were measured via venous occlusion plethysmography in 21 healthy subjects. Dose response to CGRP was assessed during graded infusion of CGRP (1, 3, and 10 ng.

Reproducibility of forearm vasodilator response to intra-arterial infusion of calcitonin gene-related peptide assessed by venous occlusion plethysmography.

Aims: To assess the reproducibility of the forearm blood flow (FBF) response to intra-arterial infusion of calcitonin-gene related peptide (CGRP), measured by venous occlusion plethysmography. In addition, to compare different ways of expressing the FBF response and perform sample size calculations.

Methods: On two separate visits, CGRP (10 ng min(-1) dl(-1) forearm) was infused for 45 min into the brachial artery of six healthy subjects.