To determine the effectiveness of pre and post-operative exercise therapy in patients undergoing peripheral artery stenting for peripheral arterial disease.
Peripheral artery disease (PAD) is a form of cardiovascular disease that affects the arteries supplying blood flow to the legs. The prevalence of PAD is increasing rapidly in the United States. When PAD is severe, it can cause pain with movement and limit a person's ability to walk or perform their normal daily activities. With severe PAD, a procedure is often performed in which an artery is held open with a small tube called a stent. Programs of exercise-based rehabilitation have been shown to greatly help these patients in terms of the pain they experience with walking, their ability to perform daily activities or those required by work, and improved quality of life. There is also a newer form of therapy, called prehabilitation, which has been shown to have important benefits for patients with PAD. Prehabilitation involves four to six weeks of exercise therapy and lifestyle recommendations before undergoing a stent procedure. Prehabilitation helps patients improve exercise tolerance and make lifestyle changes that improve risk factors before the procedure. Those who participate in prehabilitation programs have fewer complications with the stent procedure, spend fewer days in the hospital, and have a better ability to exercise and return to work more quickly. Although the benefits of prehabilitation and rehabilitation are well established, most doctors neglect to recommend these treatments to their patients who undergo a stent procedure for PAD. The research team will study the impact of prehabilitation, rehabilitation or both forms of therapy. The results will likely encourage more doctors to recommend the best option for their patients, and possibly to recommend both prehabilitation and rehabilitation among patients who are having a stent procedure.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
300
Aerobic and resistance exercise will be components of the prehabiliation and rehabilitation programs. Given the presence of PAD, a particular emphasis will be placed on volume of walking and improving walking performance.
The prehabilitation and rehabilitation programs include all Core Components of rehabilitation as outlined in guidelines. The current clinical VAPAHCS program includes smoking cessation, nutrition, risk factor management and psychosocial counseling referrals as appropriate, and these services will be available for the current proposal.
VA Palo Alto Health Care System
Palo Alto, California, United States
RECRUITINGTime to claudication pain
Time to initial onset of claudication pain with exercise treadmill test.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Peak VO2
Peak V02 will be determined on a treadmill using an individualized ramp protocol with collection of continuous ventilatory gas exchange responses.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
6-minute walk test (6MWT)
Total distance (meters) of walk in 6 minutes.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Walking Impairment Questionnaire (WIQ)
Developed to evaluate walking limitations in patients with PAD. Assesses the ability of individuals to walk defined distances and speeds and climb stairs.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Peripheral Artery Questionnaire (PAQ)
20-item questionnaire developed and validated specifically for PAD and is designed to quantify patients' physical limitations, symptoms, social function, treatment satisfaction, and quality of life.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Walking
Physical activity patterns, expressed as steps/day will be quantified using fitness/health tracking device.
Time frame: Up to 22 weeks
Energy expenditure
Energy expenditure will be quantified using fitness/health tracking device.
Time frame: Up to 22 weeks
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Chair raises
Number of repetitions completed within 60 seconds (46cm high seat).
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Upper body strength
1 repetition max for Chest Press.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Lower body strength
1 repetition max for Leg Extension.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Hand grip strength
Maximum isometric strength will be measured using a hand grip dynamometer.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Insulin sensitivity
Fasting glucose and insulin samples will be obtained from blood draw to generate Homeostasis Model Assessment of Insulin Resistance (HOMA-IR) score.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Lipid panel
Fasting total cholesterol, LDL, HDL and triglycerides will be assessed from blood draw.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Sodium
Standard Chem 20 blood draw will be used to obtain sodium in blood value.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Homocysteine
Homocysteine will be assessed from blood draw.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
High-sensitivity C-reactive protein (hs-CRP)
High-sensitivity C-reactive protein (hs-CRP) will be assessed from blood draw.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Interleukin-6 (IL-6)
Interleukin-6 (IL-6) will be assessed from blood draw.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
D-dimer
D-dimer will be assessed from blood draw.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Blood protein
Blood draw will be used to obtain blood protein value.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Albumin
Blood draw will be used to obtain albumin in blood value.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Calcium
Blood draw will be used to obtain calcium in blood value.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Potassium
Blood draw will be used to obtain potassium in blood value.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Chloride
Blood draw will be used to obtain chloride in blood value.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Carbon dioxide
Blood draw will be used to obtain carbon dioxide in blood value.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
AST/GOTU/l
Blood draw will be used to obtain AST/GOTU/l in blood value.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
ALT/GPT
Blood draw will be used to obtain ALT/GPT in blood value.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
ALK Phosphatase
Blood draw will be used to obtain ALT/GPT in blood value.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Bilirubin
Blood draw will be used to obtain total bilirubin in blood value.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Urea Nitrogen
Blood draw will be used to obtain urea nitrogen in blood value.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
Creatinine
Blood draw will be used to obtain creatinine in blood value.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks
eGFR
Blood draw will be used to obtain eGFR value.
Time frame: Baseline, 6 weeks, 14 weeks, 22 weeks