Residual Platelet Activity In Advanced Peripheral Artery Disease

NCT ID: NCT01627431

Last Updated: 2012-11-28

Basic Information

• Recruitment Status: UNKNOWN
• Clinical Phase: PHASE4
• Total Enrollment: 410 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2012-07-31
• Study Completion Date: 2015-07-31

Brief Summary

The peripheral arterial disease (PAD) is a common atherosclerotic disease manifestation and its prevalence increase with age and with the simultaneous presence of cardiovascular risk factors.

PAD patients are usually treated, as a first line treatment, with the exercise therapy, combined with the pharmacological antiplatelet therapy.

In the case of first line therapy failure, PAD patients usually undergoing to invasive revascularization procedures.

After a peripheral stent has been located, the major follow-up problem is the restenosis rate.

Published studies describe how, in a large amount of patients, can be recognised an high residual platelet activity. These data about PAD patients at the moment are lacking .

The authors would evaluate the incidence of PAD patients with an high residual platelet activity.

Detailed Description

The peripheral arterial disease (PAD) is a common atherosclerotic disease manifestation and its prevalence increases with age and with the co-presence of cardiovascular risk factors. PAD affects a large proportion of the adult population, with an age-adjusted prevalence of 4-15% which increases to 29% in case of comorbidity such as the presence of diabetes mellitus in the same individual. Less than 20% of patients with peripheral arterial laments the typical symptom of "claudication intermittens". Studies on the symptomatic PAD natural history indicate that the risk of limb loss in non-diabetic patients is low (2% or less), but the cardiovascular disease represent the leading cause of death; the annual rate of cardiovascular events (myocardial infarction, stroke or cardiovascular death) is between 5 and 7%. Medical treatment and / or surgery in this type of patient should be directed not only to improve the walking autonomy but also to reduce cardiovascular risk. Claudicant patients first-line therapy is based on structured physical exercise program and, in some specific cases, on the antiplatelet pharmacological therapy. The lack of response to exercise and / or drug therapy should lead to the next level of decision making, which is to consider limb revascularization procedures. However, in patients with suspected proximal lesion (gluteal claudication or absent femoral pulse), revascularization procedures could be considered as a first line therapy. When the revascularization procedures are considered, the first choice intervention should be the endovascular strategy, considering the lowest number of periprocedural complications. Recommendations for optimal drug therapy after revascularisation procedures in the lower limbs are hampered by lack of agreement on the optimal role of these procedures, and lack of data from randomized clinical trials. Transluminal angioplasty (PTA), primary or associated with stenting, is recommended for focal stenotic lesions of the iliac (common and external first section) and femoral-popliteal axis, particularly when the claudication intermittents is considered as severe, rather than critical ischemia. Also, this approach is recommended in non-diabetic patients with a relatively preserved tibial vessels flow. Exists a minor agreement about endovascular procedures use in extended occlusive lesions. In recent years, has become more common the use of open or covered stents during endovascular treatments in order to make it more secure and durable over time, especially in obstructive and extended lesions. This has certainly led to improved primary patency outcomes, but has entailed and still entails additional problems of drug therapy agreement.

Nowadays, the main problem concerning lower limbs revascularization is the post-procedure anti-thrombotic pharmacological treatment and the different antiplatelet drugs effectiveness This issue was addressed in two meta-analyses, where have been shown how the data are not conclusive. Moreover, a recent study by Marcucci et al (Circulation. 2009; 119: 237-42) has clearly shown that impaired platelet activation inhibition is a crucial point for the prevention of vascular outcomes, because residual platelet reactivity has been associated with adverse vascular outcomes.

Overall, these data identify two key issues:

1. Platelet hyperactivation, usually observed after revascularization procedures;

2. The platelet inhibition percentage appears crucial to reduce postoperative thrombotic complications and restenosis early onset.

Therefore, a unique aspect of this study is to analyze whether after peripheral revascularization procedures a platelet hyperactivation is observed and evaluate the possible involved mechanisms. In fact, the knowledge of the underlying mechanism could lead to more appropriate pharmacological approach to prevent platelet activation. In this context, the authors would explore the role of reactive oxygen species (ROS) in inducing platelet activation in patients with PAD undergoing revascularization devices.

Conditions

Peripheral Arterial Disease

Keywords

PAD; Peripheral revascularization; Antiplatelet therapy; Residual platelet activity

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: BASIC_SCIENCE
• Blinding Strategy: NONE

Study Groups

Antiplatelet therapy

Patients underwent peripheral revascularization procedures undergoing a double antiplatelet therapy

Group Type: OTHER

Acetylsalicylic acid

Intervention Type: DRUG

100 mg once per day

Clopidogrel

Intervention Type: DRUG

75 mg once per day

Interventions

Acetylsalicylic acid

100 mg once per day

Intervention Type: DRUG

Clopidogrel

75 mg once per day

Intervention Type: DRUG

Other Intervention Names

Aspirin; Plavix

Eligibility Criteria

Inclusion Criteria

• Claudicatio Intermittens affected patients in which both exercise than pharmacological therapies failed
• Ankle Brachial Index < 0.9 or > 1.3
• Peripheral Arteries stenosis > 50% bilateral

Exclusion Criteria

• Acute Limb Ischemia patients
• Patients that underwent a peripheral revascularization procedure within 6 months

• Minimum Eligible Age: 40 Years
• Maximum Eligible Age: 80 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

University of Florence

OTHER

Sponsor Role: collaborator

University of Roma La Sapienza

OTHER

Sponsor Role: lead

Responsible Party

Francesco Violi

Prof.

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Francesco Violi, MD

Role: STUDY_CHAIR

Divisione di Prima Clinica Medica - Sapienza University of Rome

Rosanna Abate, MD

Role: STUDY_CHAIR

Azienda Ospedaliero-Universitaria Careggi University of Florence

Locations

University of Florence - Azienda Ospedaliero-Universitaria Careggi

Florence, Florence, Italy

Site Status: NOT_YET_RECRUITING

Sapienza- University of Rome -Azienda Policlinico Umberto I

Rome, Rome, Italy

Site Status: RECRUITING

Countries

Italy

Central Contacts

Francesco Violi, Prof

Role: CONTACT

Phone: +39-06-4461933

Email: francesco.violi@uniroma1.it

Stefania Basili, Prof

Role: CONTACT

Phone: +39-06-49974678

Email: stefania.basili@uniroma1.it

Facility Contacts

Rosanna Abbate, MD

Role: primary

Francesco Violi, MD

Role: primary

Stefania Basili, MD

Role: backup

Other Identifiers

SAPIENZA-PAD

Identifier Type: -

Identifier Source: org_study_id