Trials / Completed
CompletedNCT00001629
The Role of Angiotensin Type I Receptor in the Regulation of Human Coronary Vascular Function
- Status
- Completed
- Phase
- Phase 3
- Study type
- Interventional
- Enrollment
- 49 (planned)
- Sponsor
- National Heart, Lung, and Blood Institute (NHLBI) · NIH
- Sex
- All
- Age
- —
- Healthy volunteers
- Not accepted
Summary
The renin angiotensin system (RAS) plays an important physiological and pathophysiological role in the control of blood pressure and plasma volume. Inhibition of the RAS is useful in the treatment of hypertension, cardiac failure and in some patients with myocardial infarction. Several recent clinical trials with angiotensin converting enzyme inhibitors (ACEI) have shown that they also reduce the incidence of myocardial infarction, but the mechanisms underlying this anti-ischemic effect are poorly understood. ACEI reduce angiotensin II synthesis and prevent bradykinin degradation. Results from ongoing studies in the Cardiology Branch (Protocol 95-H-0099) designed to investigate the link between ACEI and the vascular endothelium indicate that ACEI improve both endothelial dysfunction and metabolic coronary vasodilation, an effect that is partially mediated by bradykinin. The current protocol is designed to investigate whether the beneficial effects of ACEI on endothelial function are also partly due to inhibition of angiotensin II. The recent development of selective angiotensin II type 1 (AT1) receptor antagonists allows us to specifically examine the effects of angiotensin II on vasomotor activity.
Detailed description
The renin angiotensin system (RAS) plays an important physiological and pathophysiological role in the control of blood pressure and plasma volume. Inhibition of the RAS is useful in the treatment of hypertension, cardiac failure and in some patients with myocardial infarction. Several recent clinical trials with angiotensin converting enzyme inhibitors (ACEI) have shown that they also reduce the incidence of myocardial infarction, but the mechanisms underlying this anti-ischemic effect are poorly understood. ACEI reduce angiotensin II synthesis and prevent bradykinin degradation. Results from ongoing studies in the Cardiology Branch (Protocol 95-H-0099) designed to investigate the link between ACEI and the vascular endothelium indicate that ACEI improve both endothelial dysfunction and metabolic coronary vasodilation, an effect that is partially mediated by bradykinin. The current protocol is designed to investigate whether the beneficial effects of ACEI on endothelial function are also partly due to inhibition of angiotensin II. The recent development of selective angiotensin II type 1 (AT1) receptor antagonists allows us to specifically examine the effects of angiotensin II on vasomotor activity.
Conditions
Interventions
| Type | Name | Description |
|---|---|---|
| DRUG | Angiotensin II type 1 receptor antagonists |
Timeline
- Start date
- 1997-07-01
- Completion
- 2000-09-01
- First posted
- 2002-12-10
- Last updated
- 2008-03-04
Locations
1 site across 1 country: United States
Source: ClinicalTrials.gov record NCT00001629. Inclusion in this directory is not an endorsement.