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Leg Ischaemia Management Collaboration (LIMb)

2020年11月3日 更新者：University of Leicester

Single-centre prospective cohort study of patients presenting with severe limb ischaemia (SLI). The primary outcome measure will be 12 month major amputation rate. A historical cohort of patients identified retrospectively will be the comparitor group used to assess the impact of a newly-established rapid-access limb salvage clinic.

Primary aim:

- Determine the proportion of patients with SLI undergoing major lower limb amputation within 12 months of presentation.

Secondary aims:

  • Assess clinically important short-, medium- and long-term outcomes in those undergoing and not undergoing amputation
  • Prevalence and degree of frailty and cognitive impairment
  • Pevalence and degree of cardiac disease (detected by stress MRI)
  • Establish a biobank for future biomarker analysis
  • Investigate the role of frailty and cognitive assessments, cardiac MRI and biomarkers in risk-stratification of patients with SLI

研究概览

地位

招聘中

条件

详细说明

Severe limb ischaemia (SLI) is the end-stage of peripheral arterial occlusive disease (PAOD) whereby the viability of the limb is threatened due to the degree of arterial disease and subsequent ischaemia in the peripheral tissues. It is defined as ischaemic rest pain (or night pain) and/or ulceration or gangrene in the affected limb(s) for a minimum of two weeks attributed to confirmed PAOD. Treatment includes open surgical and endovascular revascularisation, with or without surgical debridement of affected tissues, amputation of toes and drainage of sepsis. In some patients revascularisation is not possible or fails resulting in the person requiring a major lower limb amputation.

Over 4000 major lower limb amputations per year were undertaken in England alone between 2003 and 2013 and a diabetes-related major lower limb amputation is performed every 30 seconds world-wide. As many as 25% of people with SLI will undergo a major lower limb amputation in the first year after presentation. Amputation negatively affects quality of life due to its negative impact on mobility, independence and ability to carry out activities of daily living.

This single-centre prospective cohort study will investigate the amputation rate at one year in patients presenting with SLI and compare this to a retrospectively identified historical cohort. This study will also investigate the prevelance and degree of frailty, cognitive impairment, and cardiac disease (detected by cardiac magnetic resonance imaging (MRI)), as well as establish a biobank for future biomarker analyses. The role of frailty and cognitive assessments, cardiac MRI and biomarker analysis in risk-stratifying patients with SLI will also be investigated.

研究类型

观察性的

注册 (预期的)

420

联系人和位置

本节提供了进行研究的人员的详细联系信息，以及有关进行该研究的地点的信息。

学习联系方式

  • 姓名：Rob D Sayers, MD
  • 电话号码：+44 (0)116 252 3141
  • 邮箱：rs152@le.ac.uk

研究联系人备份

  • 姓名：Tanya J Payne, BSc
  • 电话号码：+44 (0)116 258 3867
  • 邮箱：tjp28@le.ac.uk

学习地点

  • 英国
    • Leicestershire
      • Leicester、Leicestershire、英国、LE3 9QP
        • 招聘中
        • Glenfield Hospital Leicester
        • 副研究员：
          • Gerry P McCann, MD
        • 接触：
          • Tanya J Payne
          • 电话号码：+44 (0)116 358 3867
          • 邮箱：tjp28@le.ac.uk
        • 首席研究员：
          • Rob D Sayers, MD
        • 副研究员：
          • Matt J Bown, MD
        • 副研究员：
          • Thompson G Robinson, MD
        • 副研究员：
          • Victoria J Haunton, MD
        • 副研究员：
          • Sally J Singh, PhD
        • 首席研究员：
          • Robert SM Davies, MD
        • 副研究员：
          • Tanya J Payne, BSc
        • 副研究员：
          • Laura J Gray, PhD
        • 副研究员：
          • Harjeet S Rayt, MD
        • 副研究员：
          • Gregory S McMahon, MD

参与标准

研究人员寻找符合特定描述的人，称为资格标准。这些标准的一些例子是一个人的一般健康状况或先前的治疗。

资格标准

适合学习的年龄

18年 至 110年 (成人、年长者)

接受健康志愿者

不

有资格学习的性别

全部

取样方法

非概率样本

研究人群

As representative a sample of patients presenting to the Leicester Vascular Institute with SLI during the study period as possible. All patients presenting with SLI within the age criteria will be eligible and personal consultee consent will allow recruitment even of those patients lacking capacity to consent.

描述

PRIMARY COHORT

Inclusion Criteria:

  • All patients presenting to the Leicester Vascular Institute with SLI

Exclusion Criteria:

  • SLI not caused by PAOD
  • Patients undergoing intervention during their index presentation prior to recruitment
  • Patients lacking capacity to consent with no accompanying next of kin, relative, partner or friend who can act as a personal consulted
  • Patients who cannot read, write or understand English
  • Any significant disease or disorder which may either put the patient at risk because of participation in the study, or may influence the results of the study or the patient's ability to participate in the study

FRAILTY & COGNITIVE ADDITIONAL ASSESSMENTS

Inclusion criteria:

  • Patients recruited to the primary cohort in whom a decision has been made to undergo an intervention for SLI
  • Patients aged ≥65 years

Exclusion criteria:

  • Nil additional

CARDIAC MRI ADDITIONAL ASSESSMENTS

Inclusion criteria:

  • Patients recruited to the primary cohort in whom a decision has been made to undergo an intervention

Exclusion criteria:

  • Absolute contraindications to cardiac MRI (Pregnancy, Non-MR safe permanent pacemaker, implanted cardiac defibrillator, intra-auricular implant or intra-cranial clips, severe claustrophobia, unstable angina)
  • Contraindication to gadolinium contrast agent (Known adverse reaction, chronic renal failure (eGFR <30mL/min/1.73m^2))
  • Patients lacking capacity to consent for cardiac MRI

BIOMARKERS ADDITIONAL ASSESSMENTS

  • Patients recruited to the primary cohort in whom a decision has been made to undergo an intervention

Exclusion criteria:

  • Nil additional

学习计划

本节提供研究计划的详细信息，包括研究的设计方式和研究的衡量标准。

研究是如何设计的？

设计细节

队列和干预

团体/队列
Primary cohort
Any patient presenting to the Leicester Vascular Institute with SLI during the 2 year recruitment period (minimum 420 patients).
Frailty & cognitive additional assessments
Any patient recruited to the primary cohort aged ≥65 years and undergoing an intervention for SLI (minimum 150 patients, target 210 patients).
Cardiac MRI additional assessments
Any patient recruited to the primary cohort, with capacity to consent and undergoing an intervention for SLI (minimum 100 patients).
Biomarkers additional assessments
Any patient recruited to the primary cohort and undergoing an intervention for SLI (no target recruitment set).
Historical cohort
Retrospectively identified cohort of patients presenting to the study site with SLI between 2013 -15 (target 420).

研究衡量的是什么？

主要结果指标

结果测量
措施说明
大体时间
12 month amputation rate
大体时间：12 months post recruitment
Proportion of patients undergoing major lower limb amputation
12 months post recruitment

次要结果测量

结果测量
措施说明
大体时间
Amputation free survival
大体时间：≥12 months post recruitment
Composite outcome measure of death or amputation
≥12 months post recruitment
All-cause mortality
大体时间：≥12 months
Death from any cause
≥12 months
Quality of life
大体时间：12 and 24 months post recruitment

Quality of life as measured by the Vascular Quality of Life questionnaire (VascuQoL)

  • 25 item questionnaire, score 1-7 for each item, higher score = better quality of life
  • Domains: activities (8 items), symptoms (4 items), pain (4 items), social (2 items) and emotional (7 items); each scored 1-7 (total of domain item scores/number of items)
  • Overall score 1-7 (total item score/25)
12 and 24 months post recruitment
Disability
大体时间：12 and 24 months post recruitment

Level of disability as measured by the Barthel Index

- Score 0-20; higher score = greater degree of functional independence/lower level of disability
12 and 24 months post recruitment
Clinical Frailty Scale
大体时间：Baseline, 12 and 24 months

Prevalence and degree of frailty as measured by the Clinical Frailty Scale (CFS)

  • Score 1-9, higher score = greater degree of frailty
  • Results will also be reported dichotomised to frail (score ≥5) and non-frail (score ≤4)
Baseline, 12 and 24 months
Anxiety & Depression
大体时间：Baseline, 12 and 24 months

Prevalence and degree of anxiety and depression as measured by the Hospital Anxiety and Depression Scale (HADS)

  • 14 item questionnaire; score 0-3 for each item, higher score = more severe anxiety/depression
  • Domains: Depression (7 items), Anxiety (7 items); each scored 0-21; 0-7 = normal, 8-10 = bordeline, 11-21 = abnormal (case).
Baseline, 12 and 24 months

其他结果措施

结果测量
措施说明
大体时间
Cognitive impairment (Frailty & Cognitive additional assessments only)
大体时间：Baseline, 3 and 12 months

Prevalence of cognitive impairment as detected by the Montreal Cognitive Assessment (MoCA)

  • Score 0-30; highger score = greater level of cognitive function
  • Results will also be reported dichotomised to normal (score ≥24) and cognitive impairment (score ≤23)
Baseline, 3 and 12 months
Post-operative delirium (Frailty & Cognitive additional assessments only)
大体时间：24 and 72 hours post intervention
Incidence of post-operative delirium as detected by the Single Question in Delirium (SQiD) +/- 4 A's Test for delirium (4AT)
24 and 72 hours post intervention
Prevalence of coronary artery disease (Cardiac MR additional assessments only)
大体时间：Baseline
Prevalence of coronary artery disease as detected by stress cardiac MRI
Baseline
Incidence of peri-operative myocardial infarction (Cardiac MR additional assessments only)
大体时间：2-4 months post intervention
Incidence of peri-operative myocardial infarction as detected by cardiac MRI
2-4 months post intervention
Edmonton Frail Scale (Frailty & Cognitive additional assessments only)
大体时间：Baseline, 3 and 12 months

Prevalence and degree of frailty as measured by the Edmonton Frail Scale (EFS)

  • Score 0-17, 0-5 = not frail, 6-7 = vulnerable, 8-9 = mild frailty, 10-11 = moderate frailty, 12-17 = severe frailty
  • Results will also be reported dichotomised to frail (score ≥8) and non-frail (score ≤7)
Baseline, 3 and 12 months

合作者和调查者

在这里您可以找到参与这项研究的人员和组织。

赞助

University of Leicester

合作者

University Hospitals, Leicester
National Institute for Health Research, United Kingdom
The George Davies Charitable Trust

调查人员

  • 学习椅：Rob D Sayers, MD、University of Leicester

出版物和有用的链接

负责输入研究信息的人员自愿提供这些出版物。这些可能与研究有关。

一般刊物

研究记录日期

这些日期跟踪向 ClinicalTrials.gov 提交研究记录和摘要结果的进度。研究记录和报告的结果由国家医学图书馆 (NLM) 审查，以确保它们在发布到公共网站之前符合特定的质量控制标准。

研究主要日期

学习开始 (实际的)

2019年5月10日

初级完成 (预期的)

2022年5月9日

研究完成 (预期的)

2031年5月9日

研究注册日期

首次提交

2019年7月11日

首先提交符合 QC 标准的

2019年7月18日

首次发布 (实际的)

2019年7月19日

研究记录更新

最后更新发布 (实际的)

2020年11月4日

上次提交的符合 QC 标准的更新

2020年11月3日

最后验证

2020年11月1日

更多信息

与本研究相关的术语

关键字

其他相关的 MeSH 术语

其他研究编号

  • 0686

计划个人参与者数据 (IPD)

计划共享个人参与者数据 (IPD)？

未定

IPD 计划说明

Anonymised dataset will be available on request to the Chief Investigator (Prof Rob Sayers). The study protocol will be published in an open-access journal prior to completion of recruitment.

药物和器械信息、研究文件

研究美国 FDA 监管的药品

不

研究美国 FDA 监管的设备产品

不

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