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Residual Platelet Activity In Advanced Peripheral Artery Disease

Yalnız qeydiyyatdan keçmiş istifadəçilər məqalələri tərcümə edə bilərlər
Giriş / Qeydiyyatdan keçin
Bağlantı panoya saxlanılır
Status
Sponsorlar
University of Roma La Sapienza
Əməkdaşlar
University of Florence

Açar sözlər

Mücərrəd

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.

Təsvir

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.

Tarixlər

Son Doğrulandı: 10/31/2012
İlk təqdim: 06/13/2012
Təxmini qeydiyyat təqdim edildi: 06/19/2012
İlk Göndərmə: 06/24/2012
Son Yeniləmə Göndərildi: 11/26/2012
Son Yeniləmə Göndərildi: 11/27/2012
Həqiqi Təhsilin Başlama Tarixi: 06/30/2012
Təxmini İlkin Tamamlanma Tarixi: 06/30/2014
Təxmini İşin Tamamlanma Tarixi: 06/30/2015

Vəziyyət və ya xəstəlik

Peripheral Arterial Disease

Müdaxilə / müalicə

Drug: Antiplatelet therapy

Drug: Antiplatelet therapy

Faza

Faza 4

Qol Qrupları

QolMüdaxilə / müalicə
Other: Antiplatelet therapy
Patients underwent peripheral revascularization procedures undergoing a double antiplatelet therapy
Drug: Antiplatelet therapy
100 mg once per day

Uyğunluq Kriteriyaları

Təhsil üçün uyğun yaşlar 40 Years Üçün 40 Years
Təhsilə Uyğun CinslərAll
Sağlam Könüllüləri qəbul edirBəli
Kriteriyalar

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

Nəticə

İlkin nəticə tədbirləri

1. Residual Platelet Activity [2 years]

Evaluate the high residual platelet activity prevalence in PAD patients

İkincili Nəticə Tədbirləri

1. Target vessels thrombosis [2 years]

Evaluate the target vessels thrombosis incidence

2. Major Cardiac Events [2 years]

Evaluate the Major Cardiac Events (MACE) incidence in PAD patients undergoing the peripheral revascularization procedures.

3. Platelet aggregation tests [2 years]

Compare the different platelet aggregation tests specificity, sensitivity, accuracy and predictive values

4. Oxidative stress [2 years]

Evaluate platelet activation and oxidative stress indexes relationship

5. Laboratory tests predictive values [2 years]

Evaluate the different laboratory tests (platelet aggregation, oxidative stress markers, seric thromboxane) predictive values in identify recurrent thrombosis high risk patients

6. High risk patients score [2 years]

Validate a clinical-laboratoristic predictive score in order to identify recurrent thrombosis high risk patients

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