Study Results
Results available
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View full resultsBasic Information
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Recruitment Status
COMPLETED
Clinical Phase
NA
Total Enrollment
25 participants
Study Classification
INTERVENTIONAL
Study Start Date
2014-11-30
Study Completion Date
2015-12-31
Brief Summary
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DESIGN: Single-centre, feasibility study AIMS: The aim of this study is to evaluate the acceptability and pre-operative impact on functional capacity of a trimodal prehabilitation program in a cohort of patients undergoing aneurysm repair.
This will enable the design (feasibility and power) of a large scale Randomised Controlled Trial.
Expected outcomes
* The potential number of patients who would benefit, the compliance and acceptability of a pre-operative prehabilitation programme will be calculated.
* Preoperatively, expected at 6-weeks, the change in physical fitness of patients (assessed by the physical function section of SF-36 and measured with peak flow/6-minute walk testing) during the pre-operative phase will be assessed in both groups.
* The effects on quality of life, anxiety and depression on each study participant will be assessed immediately pre-op, expected at 6-weeks.
* The number of patients who are able to reduce or cease smoking will be reported during the pre-op phase (expected at 6 weeks), as will length of hospital stay after aortic surgery, expected at 6-8 weeks.
POPULATION: Patients undergoing planned elective aortic surgery procedures
ELIGIBILITY: Adult patients (over 18 years) undergoing elective open and endovascular aneurysm repair with capacity to consent and physical fitness to undergo an pre-operative exercise programme DURATION: 1 year from 1st June 2014
This will enable the design (feasibility and power) of a large scale Randomised Controlled Trial.
Expected outcomes
* The potential number of patients who would benefit, the compliance and acceptability of a pre-operative prehabilitation programme will be calculated.
* Preoperatively, expected at 6-weeks, the change in physical fitness of patients (assessed by the physical function section of SF-36 and measured with peak flow/6-minute walk testing) during the pre-operative phase will be assessed in both groups.
* The effects on quality of life, anxiety and depression on each study participant will be assessed immediately pre-op, expected at 6-weeks.
* The number of patients who are able to reduce or cease smoking will be reported during the pre-op phase (expected at 6 weeks), as will length of hospital stay after aortic surgery, expected at 6-8 weeks.
POPULATION: Patients undergoing planned elective aortic surgery procedures
ELIGIBILITY: Adult patients (over 18 years) undergoing elective open and endovascular aneurysm repair with capacity to consent and physical fitness to undergo an pre-operative exercise programme DURATION: 1 year from 1st June 2014
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Detailed Description
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Proposed intervention - The introduction of a biopsychosocial intervention before surgery. The physical exercise programme will be a prescribed exercise training twice per week which will be supported by a physical therapist and vascular nurse specialist. A trained clinical psychologist will also deliver a brief psychological intervention based on cognitive behavioural therapy (CBT) techniques in two sessions to modify illness, surgical preparation and rehabilitation beliefs. Lastly patients will be counselled and referred to smoking cessation services as appropriate by the vascular nurse specialist.
Baseline information will include patient demographics and medical history, quality of life assessment using SF-36 forms, hospital anxiety and depression scale (HADS) and exercise testing by a standardised 6-minute walk test Information immediately pre-operatively will be collected to include a repeat assessment of physical function with a 6-minute walk test, SF-36 assessment and HADS scores. Smoking cessation rate will be collected.
A pre and post-intervention group will be studied over a 1-year period. We will report on the eligibility, acceptability and pre-operative effect of this trimodal rehabilitation programme.
AIM AND EXPECTED IMPACT
This is a non-randomised pre-post intervention pilot study to understand the acceptability and pre-operative effects of a combined physical, psychological and social prehabilitation package in patients undergoing aneurysm repair. This will enable the design (feasibility and power) of a large scale Randomised Controlled Trial.
Our hypotheses include:
* The introduction of a prehabilitation programme will be acceptable to the majority of patients undergoing aneurysm surgery
* A physical pre-operative exercise programme will increase physical fitness before surgery
* A psychological intervention based on cognitive behaviour therapy techniques will reduce anxiety before surgery and prepare patients better for their post-operative recovery
* The introduction of psycho-social counselling for smoking cessation will encourage more patients to give up smoking pre-operatively
PARTICIPANT ENTRY: PATIENTS
PRE-REGISTRATION EVALUATIONS The research team will identify eligible patients for recruitment into the study via clinic lists, multidisciplinary meetings and referral letters before the patient attends their clinic appointment. Only adult patients undergoing aortic surgery will be selected. Patient information leaflets will be given to selected patients and patients will be given the opportunity to read them and ask questions before deciding whether or not to participate.
INCLUSION CRITERIA
* Adult patients (\>18 years old) undergoing aortic aneurysm repair.
* Ability to comprehend and retain instructions regarding self-training
* Physical fitness allowing participation in an exercise programme.
EXCLUSION CRITERIA
* Minors (\<18 years old)
* Adult patients who do not have capacity to consent.
* Emergency or urgent procedures who will not have a necessary 6 week lead in time until operation.
WITHDRAWRAL CRITERIA The patient will be made aware that they may withdraw from the study at any time without providing a reason; their care and treatment will not be affected
STUDY DESIGN The acceptability of this programme will be studied and the pre-operative impact on functional capacity will be assessed in a comparator (pre-intervention) and post-intervention group.
Patients
Patients from Imperial College Healthcare NHS Trust Vascular Unit undergoing aortic aneurysm repair will be recruited.
Study Protocol
Our current vascular pre-operative assessment service is an established nurse led service, run by a dedicated aortic clinical nurse specialist. The prehabilitation would run in conjunction with the current pre-operative screening measures currently in place - which include dobutamine stress echocardiography, renal assessment and pulmonary function tests.
-Phase 1 - Comparator (pre-intervention) evaluation
Patients undergoing present standard of care - i.e. standard work-up for aneurysm repair without nurse-led prehabilitation strategy, who meet inclusion and exclusion criteria will be given a patient information leaflet, informed they are in the pre-intervention group and consented for inclusion in the study as detailed above.
At the baseline appointment, on the same day as work-up tests, information will be collected on standardised data collection sheets to include:
* Patient demographics and medical history
* Baseline Quality of Life assessment using SF-36 forms
* Hospital anxiety and depression scale (HADS).
* Exercise testing by a standardised 6-minute walk test
* Peak Expiratory Flow Rate (PEFR)
Information immediately pre-operatively will be collected the day before operation (our standard admission is the day before) to include a repeat assessment of physical function with a 6-minute walk test, Peak Expiratory Flow Rate (PEFR), SF-36 assessment and HADS scores. Smoking cessation rate over the pre-operative period will be collected. The aneurysm repair will proceed as standard of care, and will be unchanged from standard practice.
-Phase 2 - Intervention
Proposed intervention - The introduction of a biopsychosocial intervention before surgery. The physical exercise programme will be prescribed exercise training twice per week which will be supported by our vascular nurse specialist, previously shown to have a small effect on length of stay in cardiac patients \[12\].
A trained specialist (a registered psychologist) will also deliver a brief psychological intervention based on cognitive behavioral therapy (CBT) techniques in two sessions to modify illness, surgical preparation and rehabilitation beliefs. This psychological intervention has been shown to be effective in encouraging claudicants to initiate and continue exercise training \[13\].
Lastly patients will be counselled and referred to smoking cessation services as appropriate.
Phase 2 protocol - During an initial set-up phase comprehensive information booklets will be developed to instruct the patient on these three modes of prehabilitation.
Patients who are eligible for the study will be approached in the same way as patients studied in the comparator group. At the baseline study visit, the same baseline information will be collected as for the comparator group i.e.:
At the baseline appointment, on the same day as work-up tests, information will be collected on standardised data collection sheets to include:
* Patient demographics and medical history
* Baseline Quality of Life assessment using SF-36 forms
* Hospital anxiety and depression scale (HADS).
* Exercise testing by a standardised 6-minute walk test
* Peak Expiratory Flow Rate (PEFR)
In addition patients will receive:
* Information booklets
* Physical exercise plan, run-through and explanations.
* Psychological therapy on this day or a mutually convenient day for patient and therapist.
* Counselling by the nurse specialist and referral for smoking cessation
Patients will receive a telephone follow-up with the nurse specialist at week 2 and week 4 to evaluate progress and to encourage compliance with the programme. Between weeks 5-6 the patient will have a further session with the clinical psychologist, just prior to admission for treatment, to prepare them for their impending hospitalisation.
Again, information immediately pre-operatively will be collected to include a repeat assessment of physical function with a 6-minute walk test, Peak Expiratory Flow Rate (PEFR), SF-36 assessment and HADS score. In addition, patients will be asked to fill out a questionnaire assessing compliance with and acceptability of the prehabilitation programme. Smoking cessation rate will be collected.
Data Collection
The following demographic data will be recorded on standardised data collection forms for each patient, collected from patient records and the patient interviews:
* Inclusion and exclusion criteria
* Medical history/risk factors
* ASA classification
* Planned operative procedure details
* Physical status using functional capacity, measured in metabolic equivalents (METs), with a Duke Activity Status Index (score of less than 4 indicates poor physical function).
Functional capacity may be usually expressed in metabolic equivalents (METs), where one MET is defined as the oxygen consumption of a 70-kg man at rest. Greater than 7 METs of activity tolerance is considered excellent, whereas less than 4 METs is considered poor activity tolerance.
The Duke Activity Status Index suggests questions that correlate with MET levels; for example, walking on level ground at about 4 miles per hour or carrying a bag of groceries up a flight of stairs expends approximately 4 METs of activity. This system is used by the Cleveland clinic for pre-operative cardiac evaluation. It allows a pre-operative assessment of physical function to assess predicted ability to cope at home after surgery. A brief, self-completed questionnaire (Appendix 1) can provide a standardized assessment of functional status that correlates well with an objective measure of maximal exercise capacity \[14\].
Post-operative data will be collected for patients in order to plan for a further study based on reducing length of stay.
* Inpatient complications: grade and details using standardised data collection sheets
* Length of stay
* HDU/ITU use
* Mortality
At base line visit and prior to operation each patient will be assessed using:
* Baseline Quality of Life assessment using SF-36 forms
* Hospital anxiety and depression scale (HADS).
* Exercise testing by a standardised 6-minute walk test
* Peak Expiratory Flow Rate (PEFR)
An event log will be recorded for each patient throughout the study period.
Patients undergoing intervention will be asked to complete a short questionnaire on compliance and acceptability of the prehabilitation programme.
ANALYSIS Completed data collection sheets will be analysed for omissions and missing data completed before being logged onto a central database and analysed by the research team at Imperial College, London, St. Mary's Campus.
The two groups will be compared using simple statistical methods. We intend to analyse and report on the following
* The number of patients who accepted inclusion into a pre-operative prehabilitation programme will be calculated.
* The change in physical fitness of patients (assessed by the physical function section of SF-36 and measured with peak flow/6-minute walk testing) during the pre-operative phase will be assessed pre and post-intervention groups.
* The effects on quality of life.
* The effect of a programme on anxiety and depression on each study participant will be assessed.
* The number of patients who are able to reduce or cease smoking will be reported.
* Compliance and acceptability of the prehabilitation programme.
* Morbidity and Mortality, HDU/ITU resource use as well as Length of hospital stay after aortic surgery.
Baseline information will include patient demographics and medical history, quality of life assessment using SF-36 forms, hospital anxiety and depression scale (HADS) and exercise testing by a standardised 6-minute walk test Information immediately pre-operatively will be collected to include a repeat assessment of physical function with a 6-minute walk test, SF-36 assessment and HADS scores. Smoking cessation rate will be collected.
A pre and post-intervention group will be studied over a 1-year period. We will report on the eligibility, acceptability and pre-operative effect of this trimodal rehabilitation programme.
AIM AND EXPECTED IMPACT
This is a non-randomised pre-post intervention pilot study to understand the acceptability and pre-operative effects of a combined physical, psychological and social prehabilitation package in patients undergoing aneurysm repair. This will enable the design (feasibility and power) of a large scale Randomised Controlled Trial.
Our hypotheses include:
* The introduction of a prehabilitation programme will be acceptable to the majority of patients undergoing aneurysm surgery
* A physical pre-operative exercise programme will increase physical fitness before surgery
* A psychological intervention based on cognitive behaviour therapy techniques will reduce anxiety before surgery and prepare patients better for their post-operative recovery
* The introduction of psycho-social counselling for smoking cessation will encourage more patients to give up smoking pre-operatively
PARTICIPANT ENTRY: PATIENTS
PRE-REGISTRATION EVALUATIONS The research team will identify eligible patients for recruitment into the study via clinic lists, multidisciplinary meetings and referral letters before the patient attends their clinic appointment. Only adult patients undergoing aortic surgery will be selected. Patient information leaflets will be given to selected patients and patients will be given the opportunity to read them and ask questions before deciding whether or not to participate.
INCLUSION CRITERIA
* Adult patients (\>18 years old) undergoing aortic aneurysm repair.
* Ability to comprehend and retain instructions regarding self-training
* Physical fitness allowing participation in an exercise programme.
EXCLUSION CRITERIA
* Minors (\<18 years old)
* Adult patients who do not have capacity to consent.
* Emergency or urgent procedures who will not have a necessary 6 week lead in time until operation.
WITHDRAWRAL CRITERIA The patient will be made aware that they may withdraw from the study at any time without providing a reason; their care and treatment will not be affected
STUDY DESIGN The acceptability of this programme will be studied and the pre-operative impact on functional capacity will be assessed in a comparator (pre-intervention) and post-intervention group.
Patients
Patients from Imperial College Healthcare NHS Trust Vascular Unit undergoing aortic aneurysm repair will be recruited.
Study Protocol
Our current vascular pre-operative assessment service is an established nurse led service, run by a dedicated aortic clinical nurse specialist. The prehabilitation would run in conjunction with the current pre-operative screening measures currently in place - which include dobutamine stress echocardiography, renal assessment and pulmonary function tests.
-Phase 1 - Comparator (pre-intervention) evaluation
Patients undergoing present standard of care - i.e. standard work-up for aneurysm repair without nurse-led prehabilitation strategy, who meet inclusion and exclusion criteria will be given a patient information leaflet, informed they are in the pre-intervention group and consented for inclusion in the study as detailed above.
At the baseline appointment, on the same day as work-up tests, information will be collected on standardised data collection sheets to include:
* Patient demographics and medical history
* Baseline Quality of Life assessment using SF-36 forms
* Hospital anxiety and depression scale (HADS).
* Exercise testing by a standardised 6-minute walk test
* Peak Expiratory Flow Rate (PEFR)
Information immediately pre-operatively will be collected the day before operation (our standard admission is the day before) to include a repeat assessment of physical function with a 6-minute walk test, Peak Expiratory Flow Rate (PEFR), SF-36 assessment and HADS scores. Smoking cessation rate over the pre-operative period will be collected. The aneurysm repair will proceed as standard of care, and will be unchanged from standard practice.
-Phase 2 - Intervention
Proposed intervention - The introduction of a biopsychosocial intervention before surgery. The physical exercise programme will be prescribed exercise training twice per week which will be supported by our vascular nurse specialist, previously shown to have a small effect on length of stay in cardiac patients \[12\].
A trained specialist (a registered psychologist) will also deliver a brief psychological intervention based on cognitive behavioral therapy (CBT) techniques in two sessions to modify illness, surgical preparation and rehabilitation beliefs. This psychological intervention has been shown to be effective in encouraging claudicants to initiate and continue exercise training \[13\].
Lastly patients will be counselled and referred to smoking cessation services as appropriate.
Phase 2 protocol - During an initial set-up phase comprehensive information booklets will be developed to instruct the patient on these three modes of prehabilitation.
Patients who are eligible for the study will be approached in the same way as patients studied in the comparator group. At the baseline study visit, the same baseline information will be collected as for the comparator group i.e.:
At the baseline appointment, on the same day as work-up tests, information will be collected on standardised data collection sheets to include:
* Patient demographics and medical history
* Baseline Quality of Life assessment using SF-36 forms
* Hospital anxiety and depression scale (HADS).
* Exercise testing by a standardised 6-minute walk test
* Peak Expiratory Flow Rate (PEFR)
In addition patients will receive:
* Information booklets
* Physical exercise plan, run-through and explanations.
* Psychological therapy on this day or a mutually convenient day for patient and therapist.
* Counselling by the nurse specialist and referral for smoking cessation
Patients will receive a telephone follow-up with the nurse specialist at week 2 and week 4 to evaluate progress and to encourage compliance with the programme. Between weeks 5-6 the patient will have a further session with the clinical psychologist, just prior to admission for treatment, to prepare them for their impending hospitalisation.
Again, information immediately pre-operatively will be collected to include a repeat assessment of physical function with a 6-minute walk test, Peak Expiratory Flow Rate (PEFR), SF-36 assessment and HADS score. In addition, patients will be asked to fill out a questionnaire assessing compliance with and acceptability of the prehabilitation programme. Smoking cessation rate will be collected.
Data Collection
The following demographic data will be recorded on standardised data collection forms for each patient, collected from patient records and the patient interviews:
* Inclusion and exclusion criteria
* Medical history/risk factors
* ASA classification
* Planned operative procedure details
* Physical status using functional capacity, measured in metabolic equivalents (METs), with a Duke Activity Status Index (score of less than 4 indicates poor physical function).
Functional capacity may be usually expressed in metabolic equivalents (METs), where one MET is defined as the oxygen consumption of a 70-kg man at rest. Greater than 7 METs of activity tolerance is considered excellent, whereas less than 4 METs is considered poor activity tolerance.
The Duke Activity Status Index suggests questions that correlate with MET levels; for example, walking on level ground at about 4 miles per hour or carrying a bag of groceries up a flight of stairs expends approximately 4 METs of activity. This system is used by the Cleveland clinic for pre-operative cardiac evaluation. It allows a pre-operative assessment of physical function to assess predicted ability to cope at home after surgery. A brief, self-completed questionnaire (Appendix 1) can provide a standardized assessment of functional status that correlates well with an objective measure of maximal exercise capacity \[14\].
Post-operative data will be collected for patients in order to plan for a further study based on reducing length of stay.
* Inpatient complications: grade and details using standardised data collection sheets
* Length of stay
* HDU/ITU use
* Mortality
At base line visit and prior to operation each patient will be assessed using:
* Baseline Quality of Life assessment using SF-36 forms
* Hospital anxiety and depression scale (HADS).
* Exercise testing by a standardised 6-minute walk test
* Peak Expiratory Flow Rate (PEFR)
An event log will be recorded for each patient throughout the study period.
Patients undergoing intervention will be asked to complete a short questionnaire on compliance and acceptability of the prehabilitation programme.
ANALYSIS Completed data collection sheets will be analysed for omissions and missing data completed before being logged onto a central database and analysed by the research team at Imperial College, London, St. Mary's Campus.
The two groups will be compared using simple statistical methods. We intend to analyse and report on the following
* The number of patients who accepted inclusion into a pre-operative prehabilitation programme will be calculated.
* The change in physical fitness of patients (assessed by the physical function section of SF-36 and measured with peak flow/6-minute walk testing) during the pre-operative phase will be assessed pre and post-intervention groups.
* The effects on quality of life.
* The effect of a programme on anxiety and depression on each study participant will be assessed.
* The number of patients who are able to reduce or cease smoking will be reported.
* Compliance and acceptability of the prehabilitation programme.
* Morbidity and Mortality, HDU/ITU resource use as well as Length of hospital stay after aortic surgery.
Conditions
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Aortic Aneurysm
Study Design
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Allocation Method
NON_RANDOMIZED
Intervention Model
PARALLEL
Primary Study Purpose
SUPPORTIVE_CARE
Blinding Strategy
NONE
Open label
Study Groups
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Pre-intervention
Patients treated as standard before intervention
Group Type
NO_INTERVENTION
No interventions assigned to this group
Post-intervention arm = Prehabilitation
Introduction of rehabilitation program
Group Type
ACTIVE_COMPARATOR
Post-intervention arm = Prehabilitation
Intervention Type
BEHAVIORAL
Introduction of a physical exercise training programme, psychological counselling and smoking cessation advice
Interventions
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Post-intervention arm = Prehabilitation
Introduction of a physical exercise training programme, psychological counselling and smoking cessation advice
Intervention Type
BEHAVIORAL
Eligibility Criteria
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Inclusion Criteria
\- patients undergoing elective repair, willing/able to undertake a period of prehabilitation, and those able to comprehend and retain instructions regarding self-training.
Exclusion Criteria
\- Symptomatic patients or those undergoing urgent treatment (\< 2 weeks)
Minimum Eligible Age
40 Years
Maximum Eligible Age
95 Years
Eligible Sex
ALL
Accepts Healthy Volunteers
No
Sponsors
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Imperial College London
OTHER
Sponsor Role
lead
Responsible Party
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Responsibility Role
SPONSOR
References
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Rooks DS, Huang J, Bierbaum BE, Bolus SA, Rubano J, Connolly CE, Alpert S, Iversen MD, Katz JN. Effect of preoperative exercise on measures of functional status in men and women undergoing total hip and knee arthroplasty. Arthritis Rheum. 2006 Oct 15;55(5):700-8. doi: 10.1002/art.22223.
Reference Type
BACKGROUND
Mayo NE, Feldman L, Scott S, Zavorsky G, Kim DJ, Charlebois P, Stein B, Carli F. Impact of preoperative change in physical function on postoperative recovery: argument supporting prehabilitation for colorectal surgery. Surgery. 2011 Sep;150(3):505-14. doi: 10.1016/j.surg.2011.07.045.
Reference Type
BACKGROUND
Kim DJ, Mayo NE, Carli F, Montgomery DL, Zavorsky GS. Responsive measures to prehabilitation in patients undergoing bowel resection surgery. Tohoku J Exp Med. 2009 Feb;217(2):109-15. doi: 10.1620/tjem.217.109.
Reference Type
BACKGROUND
Li C, Carli F, Lee L, Charlebois P, Stein B, Liberman AS, Kaneva P, Augustin B, Wongyingsinn M, Gamsa A, Kim DJ, Vassiliou MC, Feldman LS. Impact of a trimodal prehabilitation program on functional recovery after colorectal cancer surgery: a pilot study. Surg Endosc. 2013 Apr;27(4):1072-82. doi: 10.1007/s00464-012-2560-5. Epub 2012 Oct 9.
Reference Type
BACKGROUND
Carli F, Charlebois P, Stein B, Feldman L, Zavorsky G, Kim DJ, Scott S, Mayo NE. Randomized clinical trial of prehabilitation in colorectal surgery. Br J Surg. 2010 Aug;97(8):1187-97. doi: 10.1002/bjs.7102.
Reference Type
BACKGROUND
Dunckley M, Ellard D, Quinn T, Barlow J. Coronary artery bypass grafting: patients' and health professionals' views of recovery after hospital discharge. Eur J Cardiovasc Nurs. 2008 Mar;7(1):36-42. doi: 10.1016/j.ejcnurse.2007.06.001. Epub 2007 Jul 23.
Reference Type
BACKGROUND
Kiecolt-Glaser JK, Page GG, Marucha PT, MacCallum RC, Glaser R. Psychological influences on surgical recovery. Perspectives from psychoneuroimmunology. Am Psychol. 1998 Nov;53(11):1209-18. doi: 10.1037//0003-066x.53.11.1209.
Reference Type
BACKGROUND
Devine EC. Effects of psychoeducational care for adult surgical patients: a meta-analysis of 191 studies. Patient Educ Couns. 1992 Apr;19(2):129-42. doi: 10.1016/0738-3991(92)90193-m.
Reference Type
BACKGROUND
Mumford E, Schlesinger HJ, Glass GV. The effect of psychological intervention on recovery from surgery and heart attacks: an analysis of the literature. Am J Public Health. 1982 Feb;72(2):141-51. doi: 10.2105/ajph.72.2.141.
Reference Type
BACKGROUND
Furze G, Dumville JC, Miles JN, Irvine K, Thompson DR, Lewin RJ. "Prehabilitation" prior to CABG surgery improves physical functioning and depression. Int J Cardiol. 2009 Feb 6;132(1):51-8. doi: 10.1016/j.ijcard.2008.06.001. Epub 2008 Aug 15.
Reference Type
BACKGROUND
Owen D, Bicknell C, Hilton C, Lind J, Jalloh I, Owen M, Harrison R. Preoperative smoking cessation: a questionnaire study. Int J Clin Pract. 2007 Dec;61(12):2002-4. doi: 10.1111/j.1742-1241.2007.01565..x. Epub 2007 Sep 10.
Reference Type
BACKGROUND
Arthur HM, Daniels C, McKelvie R, Hirsh J, Rush B. Effect of a preoperative intervention on preoperative and postoperative outcomes in low-risk patients awaiting elective coronary artery bypass graft surgery. A randomized, controlled trial. Ann Intern Med. 2000 Aug 15;133(4):253-62. doi: 10.7326/0003-4819-133-4-200008150-00007.
Reference Type
BACKGROUND
Cunningham MA, Swanson V, O'Carroll RE, Holdsworth RJ. Randomized clinical trial of a brief psychological intervention to increase walking in patients with intermittent claudication. Br J Surg. 2012 Jan;99(1):49-56. doi: 10.1002/bjs.7714. Epub 2011 Oct 28.
Reference Type
BACKGROUND
Hlatky MA, Boineau RE, Higginbotham MB, Lee KL, Mark DB, Califf RM, Cobb FR, Pryor DB. A brief self-administered questionnaire to determine functional capacity (the Duke Activity Status Index). Am J Cardiol. 1989 Sep 15;64(10):651-4. doi: 10.1016/0002-9149(89)90496-7.
Reference Type
BACKGROUND
Other Identifiers
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14/LO/1368
Identifier Type: -
Identifier Source: org_study_id
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