NCT00204984

Heart and Blood Pressure Study: The Effect of Aortic Impedance on Myocardial Relaxation

The Effect of Aortic Impedance on Myocardial Relaxation

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 17 (actual)
• Sponsor: University of Wisconsin, Madison · Academic / Other
• Sex: All
• Age: 65 Years
• Healthy volunteers: Accepted

Summary

Does dilation of blood vessels (vasodilation), which decreases aortic stiffness, have a greater effect on heart myocardium relaxation (diastole) than vasodilation which affects mean pressure equally without improving aortic stiffness?

Detailed description

60 subjects, 30 with hypertension and 30 without will attend two visits to the GCRC. At each visit, pulsatile hemodynamics (by using tonometry-a non-invasive means to obtain arterial pressure tracings) and Doppler tissue imaging relaxation velocity (a measurement of myocardial relaxation obtained by echocardiography) data will be collected before and after administration of vasodilator medication. At the first visit, each patient will receive an oral dose of the vasodilator hydralazine (does not effect aortic stiffness), and at the second visit each patient will receive intravenous nesiritide (does effect aortic stiffness). The relationship between timing of the reflected pulse wave and myocardial relaxation velocity will be studied at baseline and following administration of each vasodilator to determine if changing aortic stiffness has an impact on myocardial relaxation.

Conditions

• High Blood Pressure

Interventions

Type	Name	Description
DRUG	oral hydralazine and intravenous nesiritide	vasodilators

Timeline

• Start date: 2005-05-01
• Primary completion: 2006-12-20
• Completion: 2006-12-20
• First posted: 2005-09-20
• Last updated: 2019-02-08

Locations

1 site across 1 country: United States