Use of CPETarm for Risk Stratification of Patients With CLTI

Not Applicable

Not yet recruiting

• Conditions: Chronic Limb-Threatening Ischemia; Surgery-Complications
• Interventions: Diagnostic Test: CardioPulmonary Exercise Testing

• Registration Number: NCT06404229
• Lead Sponsor: University of Manchester

Brief Summary

This is a prospective cohort study of patients undergoing surgery for chronic limb threatening ischaemia. Prior to surgery, patients will undergo CardioPulmonary Exercise testing (CPET) using an arm ergometer. Feasibility outcome measures will be recorded at testing and participants will be followed up for a period of up to 5 years to obtain clinical outcome measures.

Detailed Description

Chronic limb-threatening ischaemia (CLTI) is the most severe clinical manifestation of peripheral arterial disease, defined by the presence of pain at rest and/or tissue loss affecting the legs. It is a major cause of chronic pain, amputation and death. CLTI is a growing global healthcare problem attributable to the ageing population and increase of risk factors such such as diabetes.

Prevalence of high blood pressure, heart disease and diabetes is high amongst this cohort of patients and so it is unsurprising that surgery is associated with an alarmingly high risk of illness, complications and even death when compared to other types of surgery. As nearly half of the patients present as an emergency, assessment and optimisation of health prior to surgery is challenging.

The aims of the assessment prior to surgery includes optimising any current health problems, understanding what care may be required after surgery, allowing the patient to be fully informed of the risks and considering non surgical options where appropriate. Inadequate risk stratification can lead to delays in theatre, increased length of hospital stay and unnecessary loss of limb and/or life.

Currently there is no established method to risk stratify CLTI patients presenting as an emergency. CardioPulmonary Exercise Testing (CPET) is an exercise test useful in identification of a number of heart and lung conditions. The test is established for risk-stratification in other populations but its method of using a bicycle is not suitable for CLTI patients, nor has it previously been used in the emergency setting. This study will assess whether CPET using arm exercise instead of the traditional bicycle is a feasible test that can be performed at the bedside within 48 hours of intention to treat, required to make it a practical test in the assessment of emergency patients.

Hypothesis:

1. Cardiopulmonary exercise testing using an arm ergometer (CPETarm) is a feasible, acceptable and safe tool to use at the 'bedside' in patients undergoing emergency surgery for chronic limb threatening ischaemia (CLTI).

2. Values obtained from CPETarm and/or hand grip strength can be used to predict post operative outcomes including major adverse cardiovascular events and mortality for this group of patients.

Recruitment:

The study will enrol 120 consecutive, eligible and consenting patients admitted with with CLTI to the Manchester Vascular Centre at Manchester University National Health Service Foundation Trust. Patients scheduled to undergo non elective surgical or endovascular treatment of their chronic limb threatening ischaemia will be screened for inclusion. Decision for surgery/management will be recommended by their Consultant Vascular Surgeon.

Study Timeline

• Study First Submitted: 2024-03-12
• Status Verified: 2024-05
• Study First Submitted QC: 2024-05-03
• Last Update Submitted: 2024-05-03
• Study First Posted: 2024-05-08
• Last Update Posted: 2024-05-08
• Study Start: 2024-05-28
• Primary Completion: 2025-05-28
• Study Completion: 2030-04-28

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 120

Inclusion Criteria

• Ability and willingness to give written informed consent
• Diagnosis of chronic limb threatening ischaemia, undergoing one of the following procedures: Infra inguinal bypass, Extra anatomical bypass, Common femoral endarterectomy, Endovascular treatment, Primary amputation

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Exclusion Criteria

• Patients with active medical conditions deemed an absolute contraindication for undertaking CPET
• Ongoing evaluation for coronary artery disease (e.g awaiting stress test or cardiac catheterisation or requiring the up titration of anti anginal medications)
• Active arrthymic requiring the initiation or up titration of an anti arrthymic medication
• Active congestive cardiac failure requiring the initiation or up titration of diuretic therapy.
• Severe cardiac valvular stenosis
• Physical disability precluding ability to perform CPETarm
• Psychiatric disorder or dementia precluding them from consenting for research and/or undertaking testing and/or follow up

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
CardioPulmonary Exercise Testing	CardioPulmonary Exercise Testing	All patients included in the study will perform CardioPulmonary Exercise Testing prior to surgery

Primary Outcome Measures

Name	Time	Method
Acceptability of bedside CPET	At time of CPET testing (1 day)	The percentage of recruited participants actually performing CPET compared to the number of patients consenting.; (A) identifying reasons, and their number, as to why participants did not undertake CPET, and (B) identifying reasons, and their number, for clinician-led termination of CPET
Recruitment rate (uptake of bedside CPET)	At time of CPET testing (1 day)	The percentage of eligible patients who gave informed consent to participate in the study
Adverse or unexpected events report	At time of CPET testing (1 day)	Defined as participants experiencing serious adverse events during or after the test.; Defined adverse events for CPET as: 1) death during the stress test, 2) external defibrillation or implantable cardioverter-defibrillator discharge, 3) sustained ventricular tachycardia (wide complex tachycardia lasting longer than 30 seconds), 4) myocardial infarction, 5) syncope, 6) administration of advanced cardiac life support medications, 7) referral for direct hospital admission, or 8) referral to emergency department
Practicality of bedside CPET	At time of CPET testing (1 day)	Recorded as three variables; 1. Time between decision for surgical intervention and CPET testing; 2. Location of testing; 3. Duration of testing (inclusive of set up, patient instructions, completion of test and recovery)
Patient reported outcome measures	30 days	Established by identifying participant opinions on satisfaction with, and suitability of, CPET for future use.; Assessed in a qualitative manner using a semi structured interview with 8 pre determined questions and quantitatively using a 5 point Likert scale for 12 statements, whereby 1='strongly disagree' and 5='strongly agree'.

Secondary Outcome Measures

Name	Time	Method
Length of hospital stay	Recorded at 30 days	Defined as number of days spent in index hospital from date of operation.
Rate of re-intervention	Recorded at 30 day and 90 days	Primary patency: Freedom from occlusion of bypass-graft or endovascular treated arterial segment and freedom of restenosis that need intervention in bypass-graft or endovascular treated arterial segment.; Secondary patency: Freedom from occlusion of bypass-graft or endovascular treated arterial segment. Treated for restenosis in bypass-graft or endovascular treated arterial segment.
Hospital readmission rate	Recorded at 30 and 90 days.	Defined as a readmission after discharge from the index hospital stay and within 90 days of the primary surgical procedure
Amputation-free survival	Recorded at 30 days, 90 days, 1 year, 3 years and 5 years	Freedom of death and major limb amputation during the study
Level of care post-surgery	Recorded at 30 days	Categorised as according to the ward the patient is cared for in the immediate post operative period.; * Level 0 (postoperative recovery on a surgical ward; * Level 1 (postoperative recovery on a surgical ward with access to a critical care outreach team); * Level 2 (high dependency unit, post anaesthesia care unit); * Level 3 (intensive care unit)
Health related quality of life	Recorded at 30 and 90 days	Health related quality of life measured by The Vascular Quality of Life Questionnaire 25 (VASCUQOL25). VascuQol consists of 25 items, subdivided into five domains. Each question has a seven-point response scale. The responses are averaged to give an overall and a domain score ranging from one (worst Health Related Quality of Life, HRQoL) to seven (best HRQoL).
Higher level of care length of stay	Recorded at 30 days	Recorded as the length of stay on a ward categorised as level 2 or 3.
Peri-operative complications	Recorded at 30 days	Defined as defined as any complication that occurred during surgery or within 30 days of surgery. Graded using the Clavien-Dindo classification.
All cause mortality	Recorded at 30 days, 90 days, 1 year, 3 years and 5 years	Defined as death from any cause during the study
Discharge destination	Recorded at 30 days	Recorded as place of discharge from hospital. Discharge destination, dichotomized as home or non-home. Non-home discharge was defined as discharge to a skilled care facility (e.g., a transitional care unit, subacute hospital, or skilled nursing home), unskilled care (e.g., nursing home or assisted facility, only if this was not the patient's preoperative location), separate acute care, rehabilitation, or a multi-level senior community)
Major adverse cardiovascular events	Recorded at 30 and 90 days	Defined as non fatal myocardial infarction, non fatal stroke, cardiovascular death, coronary intervention or unstable angina requiring hospitalisation.

Trial Locations

Locations (1)

University of Manchester; 🇬🇧 Manchester, Greater Manchester, United Kingdom