이 페이지는 자동 번역되었으며 번역의 정확성을 보장하지 않습니다. 참조하십시오 영문판 원본 텍스트의 경우.

Intravascular Optical Coherence Tomography Imaging - Length of Anti-Platelet Therapy After Drug Eluting Stent Placement (FDI-DAPT-ZES)

2013년 11월 18일 업데이트: Aloke V. Finn, Emory University

Frequency Domain Imaging to Determine Stent Strut Coverage and Duration of Anti-Platelet Treatment After Endeavor Stent Placement

Patients who receive drug-coated stents (as opposed to the less frequently used bare metal stents) are currently recommended aspirin plus a thienopyridine such as Plavix, Effient, or Ticlid for one year. These guidelines apply to all patients with drug-coated stents, regardless of the type of stent they received. The purpose of these medications is to prevent a clot at the stent site when there is poor healing of artery tissues over the stent. A clot is a serious concern because it can suddenly block blood flow to the heart and cause a heart attack. These medications have been proven to be helpful in stent patients, but they do have risks. The common side-effects are related to bleeding which in a few patients can be serious. A patient may be at risk for forming a clot if they must put these medications on hold for a surgical procedure to reduce the risk of bleeding. Plavix and Effient are also expensive for patients who are underinsured or uninsured. There is interest is finding a way to show that a patient's stent has healed properly before 12 months and that they can safely stop these medications early.

This study is looking at a way to determine if patients who receive the Endeavor drug-coated stent and who are prescribed aspirin and Plavix can safely stop Plavix at 3 months instead of 12. Previous studies have shown 99.9% coverage of the body's own tissues on an Endeavor stent after 3 months.

A device called an Optical Coherence Tomography (OCT) catheter will be used in this study to look at how much a stent has healed. It allows imaging inside a heart artery and the ability to see the healing of tissues over the stent.

연구 개요

상태

빼는

상세 설명

There is a need to find a personalized approach to prescribing dual anti-platelet therapy after a stent is placed in a coronary artery. Stenting involves inserting and expanding a metal tube-shaped device in a heart artery where a blockage is limiting blood flow to the heart muscle. This device stays in the artery permanently and the body's tissues grow over it over time.

Patients in the study will have Optical Coherence Tomography (OCT) imaging done before stent placement and again 3 months later in a follow-up angiography. Patients with sufficient stent healing at 3 months will stop taking Plavix. Patients who have poor stent healing at 3 months will have to continue Plavix through 12 months. Patients will be called once a month during the first year to see how they are doing and if they are taking their prescribed medicines.

Other diagnostic methods that are used when patients have suspected heart blockages include intravascular ultrasound (a device on a catheter that allows ultrasound imaging inside a vessel), fractional flow reserve (a measurement of blood flow to determine if a blockages is serious enough to need treatment), angiography (injection of dye into the arteries to look for narrowing or blockages). These methods are used to look at the severity of heart blockages once a patient already has signs and symptoms. They are not appropriate devices for seeing if a patient's previous stent has healed properly after a certain period of time.

The long-term effectiveness of stenting procedures to treat symptomatic coronary artery disease is limited by the need to take dual anti-platelet therapy (DAPT) with aspirin and plavix to prevent complications related to clot formation within these devices due to incomplete healing of the stented segment. While anti-platelet pharmacologic therapy can minimize this risk, it is associated with an increased risk of serious bleeding events. Currently all patients receiving drug eluting stents (DES) are advised to take plavix for twelve months although a personalized approach for determining the appropriate duration of anti-platelet therapy on a patient by patient basis would reduce both thrombosis and bleeding, thereby improving the long-term safety of coronary revascularization procedures. Optical coherence tomography (OCT) is a new high resolution imaging modality with the potential to discern stent strut healing at follow-up and thus allow for individual tailoring of anti-platelet regimens. Among the commercially available coated stents used in the U.S., the zotarolimus eluting stents (ZES or Endeavor) has demonstrated superior endothelialization and long term safety data in both preclinical and clinical studies and it is very likely earlier discontinuation of anti-platelet therapy is safe. In this trial, patients undergoing ZES placement for symptomatic CAD will undergo 3 months follow-up OCT imaging to determine stent strut healing. Patients demonstrating complete healing will be withdrawn from plavix (with aspirin continued) while those with evidence of incomplete healing will be continued on DAPT for another 9 months. All patients will be followed clinically for another 9 months and intercurrent adverse events recorded. In the end, this research will establish OCT determined stent healing as a surrogate measure for determining optimal anti-platelet therapy following DES implantation.

연구 유형

관찰

참여기준

연구원은 적격성 기준이라는 특정 설명에 맞는 사람을 찾습니다. 이러한 기준의 몇 가지 예는 개인의 일반적인 건강 상태 또는 이전 치료입니다.

자격 기준

공부할 수 있는 나이

80년 이하 (어린이, 성인, 고령자)

건강한 자원 봉사자를 받아들입니다

아니

연구 대상 성별

모두

샘플링 방법

확률 샘플

연구 인구

Patients undergoing percutaneous transluminal coronary intervention (PTCI) for treatment of de novo native vessel coronary artery disease with a single DES (EndeavorTM, zotarolimus, Medtronic Vascular) will be enrolled in this study.

설명

Inclusion Criteria:

  • Any patient requiring percutaneous coronary intervention and meeting criteria (as determined by the performing physician) for Endeavor Drug Eluting Stent Placement

Exclusion Criteria:

  • Patients requiring >1 stent per treated lesion
  • ST segment elevation MI (STEMI)
  • inability to comply with study follow-up including 12 months of DAPT
  • current or planned pregnancy (for women of childbearing age)

공부 계획

이 섹션에서는 연구 설계 방법과 연구가 측정하는 내용을 포함하여 연구 계획에 대한 세부 정보를 제공합니다.

연구는 어떻게 설계됩니까?

디자인 세부사항

코호트 및 개입

그룹/코호트
RUTTS Score <30%
Patients with evidence of complete healing of stent at 3 months
RUTTS<30%
Group with evidence of incomplete healing of the stent

연구는 무엇을 측정합니까?

주요 결과 측정

결과 측정
측정값 설명
기간
Ratio of Uncovered to Total Stent Struts Per Cross Section (RUTTS) score of ≤30% of the target stent as determined by OCT pullback of the target stent
기간: 3 months
Primary Endpoint: The primary endpoint of this trial will be the frequency of near complete healing 3 months after Endeavor placement defined as a Ratio of Uncovered to Total Stent Struts Per Cross Section (RUTTS) score of ≤30%.
3 months

2차 결과 측정

결과 측정
측정값 설명
기간
death
기간: 1 year
Occurrence of events after 3-month follow-up in the group with OCT guided early discontinuation of DAPT versus those adhering to standard of care (i.e. 12 months of DAPT). Events will be defined as death, stent thrombosis (Academic Research Consortium definition), myocardial infarction (defined as any evidence of troponin elevation above the upper limit of normal), and bleeding (TIMI Bleeding Classification (table 1)). We will also examine the relationship between underlying plaque morphology and 3 month follow-up OCT determined strut coverage.
1 year
Stent Thrombosis
기간: 1 year
As defined by the Academic Research Consortium definition.
1 year
myocardial infarction
기간: 1 year
Defined as any troponin elevation above the upper limit of normal
1 year
Bleeding
기간: 1 year
As defined by the TIMI Bleeding Classification.
1 year

공동 작업자 및 조사자

여기에서 이 연구와 관련된 사람과 조직을 찾을 수 있습니다.

스폰서

수사관

  • 수석 연구원: Aloke Finn, MD, Emory University

간행물 및 유용한 링크

연구에 대한 정보 입력을 담당하는 사람이 자발적으로 이러한 간행물을 제공합니다. 이것은 연구와 관련된 모든 것에 관한 것일 수 있습니다.

연구 기록 날짜

이 날짜는 ClinicalTrials.gov에 대한 연구 기록 및 요약 결과 제출의 진행 상황을 추적합니다. 연구 기록 및 보고된 결과는 공개 웹사이트에 게시되기 전에 특정 품질 관리 기준을 충족하는지 확인하기 위해 국립 의학 도서관(NLM)에서 검토합니다.

연구 주요 날짜

연구 시작

2010년 11월 1일

기본 완료 (실제)

2010년 12월 1일

연구 완료 (실제)

2010년 12월 1일

연구 등록 날짜

최초 제출

2010년 10월 8일

QC 기준을 충족하는 최초 제출

2010년 10월 11일

처음 게시됨 (추정)

2010년 10월 13일

연구 기록 업데이트

마지막 업데이트 게시됨 (추정)

2013년 11월 20일

QC 기준을 충족하는 마지막 업데이트 제출

2013년 11월 18일

마지막으로 확인됨

2013년 11월 1일

추가 정보

이 정보는 변경 없이 clinicaltrials.gov 웹사이트에서 직접 가져온 것입니다. 귀하의 연구 세부 정보를 변경, 제거 또는 업데이트하도록 요청하는 경우 register@clinicaltrials.gov. 문의하십시오. 변경 사항이 clinicaltrials.gov에 구현되는 즉시 저희 웹사이트에도 자동으로 업데이트됩니다. .

관상동맥 질환에 대한 임상 시험

3
구독하다