Peripheral Artery Disease (PAD) is a major risk factor for lower limb amputation. Microvascular reactivity assessed with near-infrared spectrometry has been studied in people with PAD but not in people with limb loss (PLL) who have PAD. The purpose of this research is to explore whether near-infrared spectrometry measures can contribute to identifying people at risk for amputation. Specific aims include: 1) Determine the test-retest reliability of near-infrared spectrometry measures in people with peripheral artery disease with or without major unilateral amputation. 2) Determine construct validity of near-infrared spectrometry measures compared to 6-Minute Walk Test, and time to claudication onset; and self-reported prosthetic mobility in people with transtibial amputation. This methodologic prospective study with repeated assessments and long term phone follow-up every year to identify any subjects that undergo revascularization or amputation will include 2 groups of subjects: a PAD group enrolled from an out-patient walking program, and a PLL+PAD group who receive no care but have their walking step counts monitored.
Subjects: Subjects with peripheral artery disease (PAD) with or without lower limb amputation will be recruited from PAD rehabilitation programs or support groups for people with limb loss (PLL) in the Columbia University Irving Medical Center system and New York City metropolitan area. Equal numbers (n=10) will be assigned to the people with PAD group and the PLL plus PAD (PLL+PAD) group. All subjects will be 35-80 years old at risk for amputation as determined by meeting any of the following criteria. 1) People with peripheral artery disease diagnosed by ankle-brachial index (ABI) \<0.9 or 1.4. 2) People who have a history of endovascular or surgical revascularization for critical ischemia, or 3) People with previous major or minor unilateral lower limb loss due to PAD, with or without diabetes. Once informed written consent has been obtained Assessment sessions will depend on group assignment. The PLL+PAD group will attend 2 assessment sessions: initial and 1-month follow-up assessments only. The PLL+PAD group will receive no intervention. However, a monitor will be used to remotely assess their general walking activity. At the end of the initial assessment, PLL will have daily step count assessed with a StepWatch4 step activity monitor strapped just above the lateral prosthetic ankle. The average daily step count will be derived from the last full week of 24- hour/day data collection closest in time to the next assessment, at which time the StepWatch4 will be removed. Between sessions, subjects will be encouraged to continue their usual activities; no directions regarding exercise, physical activity, or walking will be given. Data from the two sessions will be used to determine test-retest reliability (Aim 1). Near infrared spectrometry measurement data from the 1st session will be used to determine associations with walking performance measures (Aim 2). The PAD group will attend 3 assessment sessions: initial, 1-month, and 2-month follow-up assessments. The PAD group will already be enrolled in a PAD rehabilitation program-independent of this research program-that consists of 2-3 times per week 1-hour sessions. Sessions include progressive treadmill training for 30- minute-including rest breaks as needed-with inclination added if tolerated. Also included is 30-minutes of calf and hamstring stretching and general strengthening including free weights for the upper limbs, cuff weights for the lower limbs, and repeated sit-to-stand and step functional training. The rehabilitation program consists of 24 sessions over 2 months and the number of sessions attended will be counted. If subjects opt for an additional 1-month of training session, they will undergo a 3-month follow-up assessment. Repeated measures data from the PAD group will be used to determine effect size change of the primary outcome measures (Aim 3). Measures: All subjects at each session will complete a questionnaire and undergo clinical assessments. Follow up calls every 6 months will be made to determine medical outcome. Questionnaire data will include individual characteristics, medical history, and self-report claudication scale. General health perception will be assessed with SF-12. Clinical assessment will occur at each session and include vital signs, ankle brachial index, near infrared spectrometry during strength and walking assessments. General lower extremity strength will be assessed with heel raises up to 25 repetitions and the 30-sec sit-to-stand. Walking performance will be assessed using the 6-Minute Walk Test using a standard 20m walkway with rests allowed as needed. Walking speed will be obtained from the first 20m. Clinical assessment of strength and walking are expected to be of moderate intensity. Statistical analysis will include group descriptions, Intraclass Correlation Coefficients for test-retest reliability, and Pearson correlation coefficients for convergent or divergent validity between near infrared spectrometry and clinical outcome measures.
Study Type
OBSERVATIONAL
Enrollment
3
No Intervention. Clinical Assessments include: vital signs, near infrared spectrometry, general leg strength, and 6-minute walking test.
Columbia University Irving Medical Center
New York, New York, United States
Microvascular Reactivity
Near Infrared Spectrometry
Time frame: Monthly: from initial assessment each month for up to 2 months.
6-Minute Walk Test
Distance and speed
Time frame: Monthly: from initial assessment each month for up to 2 months.
Claudication
Time to onset and severity
Time frame: Monthly: from initial assessment each month for up to 2 months.
General Lower-Limb Strength
30s Sit-to-Stand test
Time frame: Monthly: from initial assessment each month for up to 2 months.
Calf muscle strength
Repetitive heel raises (up to 25 max)
Time frame: Monthly: from initial assessment each month for up to 2 months.
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