Clinical Utility of Endothelial Dysfunction in PAD
|The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.|
|ClinicalTrials.gov Identifier: NCT00491751|
Recruitment Status : Terminated (Insufficient enrollment)
First Posted : June 26, 2007
Results First Posted : July 27, 2018
Last Update Posted : July 27, 2018
|Condition or disease||Intervention/treatment||Phase|
|Peripheral Arterial Disease||Drug: atorvastatin Drug: ascorbic acid Drug: Placebo||Phase 1|
Part 1 of the study will involve only patients with PAD who are undergoing non-cardiac surgery and is an intervention study. Part 2 will involve patients with PAD who have participated in Part 1 and patients with PAD who are not undergoing surgery. This part of the study does not involve an intervention.
The protocol for patients undergoing surgery is as follows: Part 1. Intervention study with follow-up for 30 days after surgery. Patients with planned surgery will be enrolled. We will test endothelial function at baseline using ultrasound and tonometry. They will then be randomzied to one of three groups: Atorvastatin 80 mg/d, Vitamin C 500 mg/d, or placebo. Subjects already on a statin medication at the time of enrollment will receive 40 mg/d of atorvastatin. Patients taking high dose statin (>40 mg/day) will be randomized to received vitamin C or placebo, and will not be eligible to receive any additional statin as part of the study. In the week immediately prior to surgery, we will test endothelial function a second time. They will then be followed for 30 days beginning with the day of surgery for cardiovascular events. Part 1 of the study involves 4 visits as follows: Visit 1 at enrollment will take place within 7-30 days of non-emergent vascular surgery and will last approximately 60 minutes Visit 2 will take place within approximately 1 week of surgery and will last approximately 30-40 minutes Visit 3 will occur on the 1st post-operative day and will last approximately 10-15 minutes Visit 4 will take place only if the subject is still an in-patient. It will take approximately 10-15 minutes Telephone contact will occur at 30 days post surgery and every six months thereafter for two years. The duration of telephone follow-up is expected to be approximately 5-10 minutes. Part 2 (long term follow-up): Patients who have completed Part 1 will be continued on in Part 2 of the study. Part 2 involves two year follow-up with no study medication. Telephone contact will be made every 6 months. subjects will make a visit to our research unit one year after the initial visit for physical examination, and if applicable, an ultrasound study of their bypass grafts.
The protocol for patients with PAD who are not undergoing surgery is as follows. These patients will participate in Part 2 of the study only (long-term follow-up with no intervention). Visit 1: will last approximately 60 minutes and involve measurement of endothelial function by ultrasound and tonometry. We will contact the subject every 6 months by telephone (5-10 minutes) for two years to determine whether a cardiovascular event has occurred. Visit 2 will occur at 1 year post enrollment and will last approximately 20-30 minutes. If the subject has had peripheral bypass surgery, we will perform an ultrasound study to determine graft blood flow.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||108 participants|
|Intervention Model:||Parallel Assignment|
|Masking:||Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)|
|Official Title:||Clinical Utility of Endothelial Dysfunction in PAD|
|Study Start Date :||May 2004|
|Actual Primary Completion Date :||June 2012|
|Actual Study Completion Date :||June 2012|
Atorvastatin 40 or 80 mg/day
atorvastatin 40 or 80 mg/day
Other Name: Lipitor
Experimental: Ascorbic Acid
Ascorbic Acid 500 mg/day
Drug: ascorbic acid
ascorbic acid 500 mg/day
Other Name: Vitamin C
Placebo Comparator: Placebo
Placebo atorvastatin and Placebo ascorbic acid
- Change in FMD [ Time Frame: 1-4 weeks ]Change in flow mediated dilation with treatment: FMD visit 2 - FMD visit 1 FMD is measured by using vascular ultrasound to determine the baseline diameter of the brachial artery. Endothelium-dependent vasodilation is induced by 5-minute arterial occlusion with a blood pressure cuff. When the cuff is released, the resultant increase in blood flow (reactive hyperemia) stimulates vasodilation of the brachial artery. This flow-mediated dilation (FMD) is expressed as the percent change from baseline. Healthy individuals typical dysplay a 10 to 12% dilation. Individuals with PAD had markedly impaired dilation of 6-7. The currernt study sought to determine whether a change in FMD would occur following intervention.
- Percentage Change in FMD in All Participants With and Without a CVD Event (Not by Treatment Group) [ Time Frame: 2 months ]This outcome is independent of the treatment group so the groups are 'CVD event' and ' No CVD Event'. Cardiovascular events (CVD) included cardiovascular disease, myocardial infarction, congestive heart failure, stroke, and unstable angina.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00491751
|United States, Massachusetts|
|Boston Medical Center|
|Boston, Massachusetts, United States, 02118|
|Principal Investigator:||Naomi Hamburg, MD||Boston University|