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Supervised Exercise
Therapy for Peripheral
Artery Disease (PAD)
American Heart Association
Diane Treat-Jacobson, PhD, RN,
FSVM, FAHA, FAAN
School of Nursing, University of
Minnesota
2
Financial Disclosures
3
National Heart Lung and Blood Institute
Margaret A. Cargill Foundation
Learning Objectives
4
• Learn the basics of developing an exercise training
program for patients with symptomatic PAD.
• Learn how to implement an exercise training
program for patients with symptomatic PAD.
Exercise Training
in Patients
With PAD
5
Exercise Training in Patients with PAD
• Efficacy of supervised treadmill training
to improve walking distance in patients
with claudication is well established
• Mechanisms by which exercise training
improves walking include both local and
systemic changes
6
Understanding the Physiology of Exercise
CardiacOutput =
HR x strokevolume
7 Keteyian, Ehrman, et al. Advanced exercise physiology: essential concepts and applications p. 74.
Understanding the Physiology of Exercise
No ischemia/Pain:
Blood/oxygen supply = Oxygen demand
Ischemia/Pain:
Blood/oxygen supply < Oxygen demand
Hiatt & Brass, 2006. Pathophysiology of Intermittent Claudication p. 240. In Vascular Medicine Creager, Dzau, Loscalzo, Eds. Slide courtesy of Jon Ehrman, PhD
8
Pathophysiology of PAD
• PAD-reduced lumen
diameter
• Reduced blood flow
and O2 delivery
Endothelial
dysfunction
Ischemia Systemic
inflammation
Skeletal muscle fiber:
• denervation
• atrophy
• altered myosin expression
Altered aerobic muscle
metabolism
• Poor aerobic capacity
• Reduced muscle
strength and endurance
• Impaired walking
ability
• Decreased QoL
Deconditioning& worsening:
• obesity
• hypertension
• dyslipidemia
• hyperglycemia
• thrombotic risk
A
VICIOUS
CYCLE
X
9 Stewart et al, N Engl J Med 2002; 347: 1941-1951
Proposed Mechanisms by
Which Exercise May Improve
Function and Symptoms
10 Stewart et al, N Engl J Med 2002; 347: 1941-1951
• Enhanced ATP production
(mitochondrial function)
• Increased muscle strength
• Improved walking economy due to
improved walking biomechanics
• Improved pain threshold/tolerance
Treadmill Exercise Training for Claudication
There is a wide range of response reported, depending on
training methods and duration, as well as patient population.
Duration of
Supervised
Program
Change in
Claudication
Onset Distance
(Meters)
% Change in
Claudication
Onset Distance
Change in Peak
Walking Distance
(Meters)
% Change in
Peak Walking
Distance
12 weeks (n=8) 156.60 (92–243 m) 103% (54–165%) 283.10 (191–402 m) 79% (42–137%)
24–52 weeks (n=7) 251.23 (155–310 m) 167% (109–230%) 334.06 (212–456 m) 92% (50–131%)
Overall (n=15) 203.93 m 128% 307.45 82%
11 Parmenter, et al, Atherosclerosis, 2011
Pain-Free Walking Exercise Therapy
• 12-week intervention of treadmill training to onset
of pain—4 studies (Mika, et al. 2005;2006;2011;2013)
• Studies 1–3: (total n=196) resulted in:
‒ Increase in pain-free walking distance of 110% (217 meters)
‒ Increase in peak walking distance of 52% (247 meters)
‒ No increases in inflammatory markers after exercise training (2005)
‒ Erythrocyte deformability was significantly improved only in the
exercise group (2011)
‒ No improvement in control group
12
• Study 4 (2013) compared two treadmill walking protocols (12 weeks):
1. Traditional treadmill walking into moderate to severe discomfort
2. Vs. treadmill walking only to the onset of claudication
‒ Both groups had statistically significant improvement in walking distance
‒ No statistical differences between groups:
Pain-Free Walking Exercise Therapy
13
Moderate Intensity Group
• Improved pain-free walking
distance 120% (121 meters)
• Improved peak walkingdistance
100% (393 meters)
Pain-Free Walking Group
• Improved pain-free walking
distance 93% (141 meters)
• Improved peak walkingdistance
98% (465 meters)
Lower Extremity Cycling
Investigator Sample
Size
Duration Change with
Leg Cycling
Change
with
Treadmill
Training
Change in
Control
Sanderson,
Askew et al.
2006
n=42 6 weeks PWD +43m
COD +16m
PWD +215m
COD +174m
PWD -16m
COD +49m
Walker,
Nawaz et al.
2000
n=67 6 weeks PWD +137m
COD +114m
PWD none
COD none
Zwierska,
Walker et al.
2005
n=104 24 weeks PWD +31%
COD +57%
PWD none
COD none
14
Aerobic Upper Body Exercise Therapy for PAD
Investigators From Sheffield, UK
• Series of studies comparing arm ergometry (arm cranking)
versus leg cycling and control (Walker, Nawaz et al. 2000,
n=57; Zwierska, Walker et al. 2005, n=104) or control (Tew,
Nawaz et al. 2009, n=51)
• Exercise training 2x/week; 40-minute sessions; 12–24 weeks
• Outcomes: 50% improvement in PFWD and 30% in MWD
• One study (Tew, Nawaz et al. 2009) found increased time to
minimal STO2 of calf muscle following 12 weeks of arm
exercise
15
Exercise Training for Claudication (ETC) Study
16
Randomized, controlled pilot study to determine
the relative efficacy of 12 weeks of 3x/week
supervised treadmill training or arm ergometry
alone, or in combination, versus ‘usual care’ in
patients with claudication
• Claudication onset distance after 12 weeks exercise training:
AE=+133m (82%); TM= +91.6m (54%); Combo= +62m (60%)
• Peak walking distance after 12 weeks of exercise training:
AE=+182m (53%); TM= +295m (69%); Combo= +217m (68%)
• No improvement in control subjects
Treat-Jacobson, Bronas et al. 2009
CLEVER:
19 Murphy, T.P. et al. J Am Coll Cardiol. 2015; 65(10):999-1009
Supervised Exercise Versus Iliac Artery Stenting
Change from Baseline to Six (6) Months and 18 months
Peak Walking Time Claudication Onset Time
CLEVER: Cost Effectiveness
Pre-planned analysis of cost effectiveness of
supervised exercise (SE) stenting, and optimal
medical care (OMC) for claudication
• Incremental cost effectiveness ratios (ICERS)
̶ $24,070 per quality adjusted life year gained for SE vs OMC
̶ $41,376 per quality adjusted life year gained for Stent vs OMC
̶ $122,600per quality adjusted life year gained for Stent vs SE
20 Reynolds, et al., JAHA, 2014; 3:e001233
CLEVER: Cost Effectiveness
“Given the increased expense and marginal
benefits of ST relative to SE, there would appear
to be no rational justification for covering ST but
not SE for the treatment of claudication.”
(Reynolds, et al. p. 8)
21 Reynolds, et al., JAHA, 2014; 3:e001233
COR LOE Recommendations
I A
In patients with claudication, a supervised exercise program
is recommended to improve functional status and QoL and
to reduce leg symptoms.
I B-R
A supervised exercise program should be discussed as a
treatment option for claudication beforepossible
revascularization.
IIa A
In patientswith PAD, a structured community- or home-
based exercise program with behavioral change techniques
can be beneficial to improve walking ability and functional
status.
IIa A
In patientswith claudication,alternativestrategies of
exercise therapy, includingupper-body ergometry, cycling,
and pain-free or low-intensity walking that avoids
moderate-to-maximumclaudication while walking,can be
beneficial to improve walking abilityand functional status.
COR-Class
(strength) of
recommendation
LOE-Level
(quality) of
evidence
Supervised Exercise Rehabilitation
22 Gerhard-Herman M, et al. 2016 AHA/ACC guideline on the management of patients with lower extremity peripheral artery disease. Circulation. 2016;69(11):1465-1508.
2016 PAD Guideline Definitions
23
Structured exercise program
• Planned programthat provides individualized recommendations for type, frequency, intensity, and
durationof exercise.
• Program provides recommendations for exercise progression to assure that the body is consistently
challenged to increase exercise intensityand levels as functional status improves over time.
Supervised exercise program
• Program takes place in a hospital or outpatient facility.
• Program uses intermittent walking exercise as the treatment modality.
• Program can be standalone or within a cardiac rehabilitation program.
• Program is directly supervised by qualified healthcareprovider(s).
• Trainingis performed for a minimum of 30–45 minutes/session; sessions are performed
at least 3 times/week for a minimum of 12 weeks.
• Traininginvolvesintermittentbouts of walking to moderate-to-maximum
claudication,alternatingwith periods of rest.
• Warm-up and cool-down periods precede and follow each session of walking.
2016 PAD Guideline Definitions
24
Structured community- or home-based exercise program
• Program takes place in the personal setting of the patient rather than in a clinical setting.
• Program is self-directed with guidance of healthcare providers.
• Healthcare providers prescribe an exercise regimen similar to that of a supervised program.
• Patient counseling ensures understanding of how to begin and maintain the program and how
to progress the difficulty of the walking (by increasing distance or speed).
• Program may incorporate behavioral change techniques, such as health coaching or use of
activity monitors.
CMS Coverage Language for SET
for Treatment of Symptomatic PAD
25
• 3-1-2017:“The Centers for Medicare & Medicaid Services (CMS) proposes that the evidence is
sufficient to cover supervised exercise therapy (SET) for beneficiaries with intermittent
claudication (IC) for the treatment of symptomaticperipheral artery disease (PAD).”
• A SET program must include:
̶ Sessions lasting 30–60 minutes comprised
of a therapeutic exercise-training program
for PAD in patients with claudication
• CMS proposes that Medicare Administrative Contractors (MACs) have the discretion to cover SET
beyond 36 sessions over 12 weeks and may cover an additional 36 sessions over an extended
period of time with a new referral if patients continue to be symptomatic.
̶ Three sessions per week
̶ Up to 12 weeks of sessions
̶ (CPT code: 93668)
Reimbursement
26
CPT code: 93668
Payment: for 2018 for on-campus hospital outpatient setting ~$55 per session; recall patient
pays for 20% or approximately $11 per session
ICD10 Codes:
I73.9 Peripheral vascular disease, unspecified
I70.20 Unspecified atherosclerosis of native arteries of extremities
I70.21 Atherosclerosis of native arteries of extremities w/intermittent claudication
I70.22 Atherosclerosis of native arteries of extremities w/rest pain
(-) Add 6th character
1 – right leg 2 – leftleg 3 – bilaterallegs
NOTE: Always check with your Medicare Administrative Contractor (MAC) for specifics.
Our Experience
27
• Two projects that have informed implementation of SET for
PAD
• PAD PRAIRIE Initiative
̶ Implementing SET for PAD in communities in rural Minnesota
• Clinical implementation of SET for PAD throughout the Fairview
cardiac rehabilitation centers in the Twin Cities Metropolitan
area
• This has allowed us to see the “real world” implications of an
implementation of a clinical PAD exercise program.
Elements Needed
28
Develop ProgrammaticInfrastructure
• Identify medical director.
• Establish referral process. Make providers aware of
availability SET for PAD.
̶ May need changes to electronic health record
• Train cardiac rehabilitation staff about how to implement
SET for PAD.
• Develop implementation process.
Baseline Assessment
29
• Functional evaluation
̶ Graded Exercise Test (Gardner; Hiatt; Bronas/Treat-Jacobson)
• Peak walking time or distance (PWT/D); claudication onset time or distance
(COT/D)
̶ 6-minute walk test
̶ Short Physical Performance Battery
̶ Timed Up and Go (TUG) Test
• Subjective assessment
̶ Walking Impairment Questionnaire
̶ Quality of life (PADQOL, VASCUQOL, PAQ)
̶ Functional status (SF-36, PROMIS)
• Orient patient to exercise equipment
Medical History (check all that applyand explain)
 Heart  Other
 Lung
 Stroke
 Depression
 Orthopedic
Risk Factorsfor CAD (check all that apply)
 Weight  Exercise
 Stress  HTN
 Cholesterol  DM
 FamilyHx  Depression
Wounds Present:
Do you have any wounds on your feet? Yes No
Location of wounds:
Do you know how to do a foot inspection? Yes No
Handout provided? Yes No
30
Pain Screen:
Intensity Rating:
Location: Onset:
Duration of ea. Episode:
Precipitating Factors:
Alleviating Factors:
ABIs:
Right Pre Ex: Post Ex:
Left Pre Ex: Post Ex:
Symptomsof Claudication:
Location of Claudication:
Stresstest results(if available):
Max HR:
85% of max HR:
Onset of Claudication: minutes
Peak MET Level:
Peripheral Artery Disease
Supervised Exercise Therapy Evaluation
Client Name: MR#: CSN#:
Date: DOB/Age: Diagnosis:
6-Minute Walk Test: Initial Date: DischargeDate:
Total Time Walked
Resting Heart Rate (bpm)
Exercise Heart Rate
Recovery Heart Rate
Resting Blood Pressure (mm Hg)
Exercise Blood Pressure
Recovery Blood Pressure
Claudication Onset Time (COT)
Claudication Onset Distance (COD)
Total Distance Walked (PWD)
Effort Rating (OMNI Scale)
O2 Saturation
31
Peripheral Artery Disease
Supervised Exercise Therapy Evaluation
Peripheral Artery Disease
Supervised Exercise Therapy Evaluation
Yes No
Client Name: MR#: CSN#:
FALLS SCREEN (Circle one)
Have you fallentwo or more times in the past year? Yes No Have you fallenand had an injury in the past year?
Referral toPhysical Therapy? Yes No
Evaluation Therapist Signature: Date: Time:
Discharging TherapistSignature: Date: Time:
Outcomes: Initial Discharge
MET level (6 MWT): MET level (6 MWT):
MET level (treadmill): MET level (treadmill):
TUG Test: 1st: 2nd: TUG Test: 1st: 2nd:
32
Initial MET level (treadmill) is based on third visit. Discharge MET level (treadmill)is based on peak METs achieved at end of program.
Goals:
1. 2.
Initial Session: Comments:
Discharge Summary: GoalsMET: Yes No Comments:
Treadmill Walking Exercise
• Considered the gold standard for exercise
therapy for PAD
̶ Initial prescription (speed and grade of
treadmill) is determined by baseline functional
testing
̶ Perform a treadmill familiarization to allow the
patient to determine preferred walking speed
̶ Training sessions consist of intermittentbouts
of walking/resting based on claudication level
̶ Use claudication scale to determine
exercise/restcycles
33
Claudication Pain Scale
34 ACSM Guidelines for Exercise Testing and Prescription, 2017
0 = no pain
1 = mild pain
2 = moderate pain
3 = intense pain
4 = unbearable pain
Resting or early exercise effort
1st feeling of any pain in legs
Pain level at which exercise
training should cease
Nearly maximal pain
Most severe pain experienced
Claudication Pain Scale
Resting or early exercise effort
Where patient needs to stop
during exercise training
1st feeling of any pain in legs
35
0 = no pain
1 = onset of pain
2 = mild pain
3 = moderate pain
4 = moderate pain
5 = severe pain
Stop before you have severe pain.
Treadmill Walking Exercise
36
Intensity and Time
• Begin at initial speed/grade that brings on
claudication within 2–5 minutes.
• Walk to bring on claudication.
̶ Make progressive increases in walking time.
̶ Stop and sit when you reach moderate intensity pain.
̶ Resume when pain has completely subsided.
̶ Continually repeat process for total time
(walking + resting) of 30–60 minutes.
• Make progressive increases in grade
and speed over time as walking
duration improves.
Peripheral Artery Disease Supervised Exercise Therapy
Daily Progress Note
Diagnosis:
Date: / Session #: Blood Sugar: Pre: Post:
MODALITY SPEED GRADE TIME ONSETOF PAIN PAIN (0-5 SCALE) OMNI
EFFORT
RESTTIME
OT
WORK
RestingHeart Rate: Exercise Heart Rate: RestingBloodPressure:
ExerciseBloodPressure: Total Exercise Time: Total Rest Time: Total SessionTime:
Symptoms BeyondClaudication Pain: Home Exercise:
Assessment/Progress: Plan:
Signature: Date: Time:
546345 Rev 8/17 Progress Note/Clinic Note Original: Medical Record Page 1
37
Session1: Choose a comfortablewalking speedand adjust grade as needed to induce a 3–4/5 claudication
within 5–10 minutes. Have participant rest until pain dissipates.Repeatintervals 60 minutes as tolerated.
If able to walk continuously for8–10 minutes or
more
If not able to walk continuously for8–10 minutes
Continue progressionscheme until participant is able to walk continuously for
8–10 minutes at a grade of 10%; increase by 0.1 mph next session
If patient able to walk continuously for8–10 minutes at more
than 3.0 mph and 10% grade
Increase grade by 1%
NEXT SESSION
If able to walk at 15% grade and 3.0 mph, continue increasing mph by 0.1 mph each time individual is able to walk
continuously for 8–10 minutes NEXT SESSION
If not able to walk continuously for8–10 minutes
Continue at the same speed and grade
Continue at the same intensity
Increase grade by 1%
Session 2: Repeat session 1 exercise prescription
Treadmill Protocol
38 Treat-Jacobson, Bronas, et al, 2009
SET for PAD in the “Real World”
• Most PAD exercisetrials have compared treadmill
exercise to another condition (procedure, alternative
exercise, control).
• Patients needed to be able to walk on a treadmill at 2
mph, otherwise they were excluded.
• We have found that many PAD patients are not willing
or able to walk on a treadmill (balance, discomfort).
• Number of treadmills may be limited.
• Alternative forms of exercise should be considered.
39
SET for PAD in the “Real World”
• Try treadmill or other walking exercisefirst.
• If unable to perform treadmill exercise or if walking
duration is so short that benefit is unlikely, consider
alternative mode:
̶ Seated aerobic arm exercise
̶ Recumbent total body stepping (NuStep)
̶ Lower extremity cycling
• Encourage the exercise therapists to apply their art and
science as they do with cardiac rehabilitation.
40
Session 1–6: Initiate UBE-EX at 50–60 rpm; adjust ergometer resistance to
promote moderate exertion (RPE 12–13). UBE-EX performed at intervals of
2:2 for entirety of 60-minute session
Session 7–12: Progress UBE-EX by increasing work/rest ratio to 3:2; adjust
resistance to promote moderate intensity (RPE 12–13)
Session 13–30: Progress UBE-EX by gradually increasing work/rest ratios
from 3:2 to 5:1 over several weeks. Adjust resistance to promote moderate
to vigorous intensity (RPE 13–14)
Session 31: Progress UBE-EX by increasing work/rest ratio to 5:1 adjust
resistance to promote vigorous intensity (RPE 14–15)
PAD PRAIRIE Initiative
41
Arm Ergometry Protocol
Progress workload by 1 level Continue at same intensity
If patient is able to exercise at workload (level) 10 continuously for 8–10
minutes, increase pace (steps per minute) by 10
If patient is able to exercise continuously for If patient is not able to exercise continuously
8–10 minutes for 8–10 minutes
Progress workload by 1 level Continue at same intensity
If patient is able to exercise at workload (level) 20 continuously for 8–10
minutes, maintain intensity for remainder of program
If patient is able to exercise continuously
for 8–10 minutes
If patient is not able to exercise continuously
for 8–10 minutes
PAD PRAIRIE Initiative
42
Total Body Recumbent Stepping Protocol
Session 1: Determine comfortable step rate (50–80 steps per minute), adjust resistance
(level) that induces 3–4/5 claudication within 5–10 minutes. Have participant rest until
pain dissipates. Repeat intervals for entirety of 60-minute session.
Session 2: Repeat session 1 exercise prescription
43 Courtesy of Jon Ehrman, PhD
Where to put a chair?
Someone took
my treadmill!!
Safety Considerations
44
• Potential to unmask new angina due to increased
exercise capability
̶ Follow up on new signs and symptoms of
coronary disease
• Abrupt increase in claudication symptoms could
signal worsening of lower extremity arterial disease
̶ Evaluate for deterioration in limb blood flow
Safety Considerations
45
Assess legs and feet for indications
of critical limb ischemia.
• Ask patient about sores or pain.
• If known open sore or pain, assess more
often.
• Evaluate skin: color, hair, shiny, thin,
fragile.
Critical Limb Ischemia
Dependent rubor Elevation pallor
46
Collecting Outcome Data
• Not a CMS requirement, but part of “Best Practices”
for Cardiac Rehabilitation
• Collect same measurements as at baseline
• Functional
̶ Change in walking speed and grade
̶ 6 MWT
̶ Graded treadmill test to assess for pain-free and peak
walking time
̶ PROMIS or SF-36 questionnaire
̶ WIQ (Walking Impairment Questionnaire)
• Quality of Life
̶ PADQOL
̶ VASCUQOL
47
Resources
48
• Intake and progress forms being finalized and can be adapted
• PAD PRAIRIEwebsite https://www.nursing.umn.edu/research/research-projects/pad-
prairie/resources-providers and videos available
̶ Functional Assessment testing
• 6-minute walk test
• Timed Up and Go Test (TUG)
• Short Physical Performance Battery
̶ How to initiate progress a patient in supervised treadmill exercise and aerobic
arm exercise
• Updated PAD Rehabilitation Toolkit available at no charge on AACVPR website
• AHA commissioned a Science Advisory “How to Implement Supervised Exercise
Therapy for Patients With Symptomatic Peripheral Artery Disease,” which should be
completed in the next six months.

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Webinar_3_Exercise_in_PAD_slides[1].pptx

  • 1. Supervised Exercise Therapy for Peripheral Artery Disease (PAD) American Heart Association
  • 2. Diane Treat-Jacobson, PhD, RN, FSVM, FAHA, FAAN School of Nursing, University of Minnesota 2
  • 3. Financial Disclosures 3 National Heart Lung and Blood Institute Margaret A. Cargill Foundation
  • 4. Learning Objectives 4 • Learn the basics of developing an exercise training program for patients with symptomatic PAD. • Learn how to implement an exercise training program for patients with symptomatic PAD.
  • 6. Exercise Training in Patients with PAD • Efficacy of supervised treadmill training to improve walking distance in patients with claudication is well established • Mechanisms by which exercise training improves walking include both local and systemic changes 6
  • 7. Understanding the Physiology of Exercise CardiacOutput = HR x strokevolume 7 Keteyian, Ehrman, et al. Advanced exercise physiology: essential concepts and applications p. 74.
  • 8. Understanding the Physiology of Exercise No ischemia/Pain: Blood/oxygen supply = Oxygen demand Ischemia/Pain: Blood/oxygen supply < Oxygen demand Hiatt & Brass, 2006. Pathophysiology of Intermittent Claudication p. 240. In Vascular Medicine Creager, Dzau, Loscalzo, Eds. Slide courtesy of Jon Ehrman, PhD 8
  • 9. Pathophysiology of PAD • PAD-reduced lumen diameter • Reduced blood flow and O2 delivery Endothelial dysfunction Ischemia Systemic inflammation Skeletal muscle fiber: • denervation • atrophy • altered myosin expression Altered aerobic muscle metabolism • Poor aerobic capacity • Reduced muscle strength and endurance • Impaired walking ability • Decreased QoL Deconditioning& worsening: • obesity • hypertension • dyslipidemia • hyperglycemia • thrombotic risk A VICIOUS CYCLE X 9 Stewart et al, N Engl J Med 2002; 347: 1941-1951
  • 10. Proposed Mechanisms by Which Exercise May Improve Function and Symptoms 10 Stewart et al, N Engl J Med 2002; 347: 1941-1951 • Enhanced ATP production (mitochondrial function) • Increased muscle strength • Improved walking economy due to improved walking biomechanics • Improved pain threshold/tolerance
  • 11. Treadmill Exercise Training for Claudication There is a wide range of response reported, depending on training methods and duration, as well as patient population. Duration of Supervised Program Change in Claudication Onset Distance (Meters) % Change in Claudication Onset Distance Change in Peak Walking Distance (Meters) % Change in Peak Walking Distance 12 weeks (n=8) 156.60 (92–243 m) 103% (54–165%) 283.10 (191–402 m) 79% (42–137%) 24–52 weeks (n=7) 251.23 (155–310 m) 167% (109–230%) 334.06 (212–456 m) 92% (50–131%) Overall (n=15) 203.93 m 128% 307.45 82% 11 Parmenter, et al, Atherosclerosis, 2011
  • 12. Pain-Free Walking Exercise Therapy • 12-week intervention of treadmill training to onset of pain—4 studies (Mika, et al. 2005;2006;2011;2013) • Studies 1–3: (total n=196) resulted in: ‒ Increase in pain-free walking distance of 110% (217 meters) ‒ Increase in peak walking distance of 52% (247 meters) ‒ No increases in inflammatory markers after exercise training (2005) ‒ Erythrocyte deformability was significantly improved only in the exercise group (2011) ‒ No improvement in control group 12
  • 13. • Study 4 (2013) compared two treadmill walking protocols (12 weeks): 1. Traditional treadmill walking into moderate to severe discomfort 2. Vs. treadmill walking only to the onset of claudication ‒ Both groups had statistically significant improvement in walking distance ‒ No statistical differences between groups: Pain-Free Walking Exercise Therapy 13 Moderate Intensity Group • Improved pain-free walking distance 120% (121 meters) • Improved peak walkingdistance 100% (393 meters) Pain-Free Walking Group • Improved pain-free walking distance 93% (141 meters) • Improved peak walkingdistance 98% (465 meters)
  • 14. Lower Extremity Cycling Investigator Sample Size Duration Change with Leg Cycling Change with Treadmill Training Change in Control Sanderson, Askew et al. 2006 n=42 6 weeks PWD +43m COD +16m PWD +215m COD +174m PWD -16m COD +49m Walker, Nawaz et al. 2000 n=67 6 weeks PWD +137m COD +114m PWD none COD none Zwierska, Walker et al. 2005 n=104 24 weeks PWD +31% COD +57% PWD none COD none 14
  • 15. Aerobic Upper Body Exercise Therapy for PAD Investigators From Sheffield, UK • Series of studies comparing arm ergometry (arm cranking) versus leg cycling and control (Walker, Nawaz et al. 2000, n=57; Zwierska, Walker et al. 2005, n=104) or control (Tew, Nawaz et al. 2009, n=51) • Exercise training 2x/week; 40-minute sessions; 12–24 weeks • Outcomes: 50% improvement in PFWD and 30% in MWD • One study (Tew, Nawaz et al. 2009) found increased time to minimal STO2 of calf muscle following 12 weeks of arm exercise 15
  • 16. Exercise Training for Claudication (ETC) Study 16 Randomized, controlled pilot study to determine the relative efficacy of 12 weeks of 3x/week supervised treadmill training or arm ergometry alone, or in combination, versus ‘usual care’ in patients with claudication • Claudication onset distance after 12 weeks exercise training: AE=+133m (82%); TM= +91.6m (54%); Combo= +62m (60%) • Peak walking distance after 12 weeks of exercise training: AE=+182m (53%); TM= +295m (69%); Combo= +217m (68%) • No improvement in control subjects Treat-Jacobson, Bronas et al. 2009
  • 17. CLEVER: 19 Murphy, T.P. et al. J Am Coll Cardiol. 2015; 65(10):999-1009 Supervised Exercise Versus Iliac Artery Stenting Change from Baseline to Six (6) Months and 18 months Peak Walking Time Claudication Onset Time
  • 18. CLEVER: Cost Effectiveness Pre-planned analysis of cost effectiveness of supervised exercise (SE) stenting, and optimal medical care (OMC) for claudication • Incremental cost effectiveness ratios (ICERS) ̶ $24,070 per quality adjusted life year gained for SE vs OMC ̶ $41,376 per quality adjusted life year gained for Stent vs OMC ̶ $122,600per quality adjusted life year gained for Stent vs SE 20 Reynolds, et al., JAHA, 2014; 3:e001233
  • 19. CLEVER: Cost Effectiveness “Given the increased expense and marginal benefits of ST relative to SE, there would appear to be no rational justification for covering ST but not SE for the treatment of claudication.” (Reynolds, et al. p. 8) 21 Reynolds, et al., JAHA, 2014; 3:e001233
  • 20. COR LOE Recommendations I A In patients with claudication, a supervised exercise program is recommended to improve functional status and QoL and to reduce leg symptoms. I B-R A supervised exercise program should be discussed as a treatment option for claudication beforepossible revascularization. IIa A In patientswith PAD, a structured community- or home- based exercise program with behavioral change techniques can be beneficial to improve walking ability and functional status. IIa A In patientswith claudication,alternativestrategies of exercise therapy, includingupper-body ergometry, cycling, and pain-free or low-intensity walking that avoids moderate-to-maximumclaudication while walking,can be beneficial to improve walking abilityand functional status. COR-Class (strength) of recommendation LOE-Level (quality) of evidence Supervised Exercise Rehabilitation 22 Gerhard-Herman M, et al. 2016 AHA/ACC guideline on the management of patients with lower extremity peripheral artery disease. Circulation. 2016;69(11):1465-1508.
  • 21. 2016 PAD Guideline Definitions 23 Structured exercise program • Planned programthat provides individualized recommendations for type, frequency, intensity, and durationof exercise. • Program provides recommendations for exercise progression to assure that the body is consistently challenged to increase exercise intensityand levels as functional status improves over time. Supervised exercise program • Program takes place in a hospital or outpatient facility. • Program uses intermittent walking exercise as the treatment modality. • Program can be standalone or within a cardiac rehabilitation program. • Program is directly supervised by qualified healthcareprovider(s). • Trainingis performed for a minimum of 30–45 minutes/session; sessions are performed at least 3 times/week for a minimum of 12 weeks. • Traininginvolvesintermittentbouts of walking to moderate-to-maximum claudication,alternatingwith periods of rest. • Warm-up and cool-down periods precede and follow each session of walking.
  • 22. 2016 PAD Guideline Definitions 24 Structured community- or home-based exercise program • Program takes place in the personal setting of the patient rather than in a clinical setting. • Program is self-directed with guidance of healthcare providers. • Healthcare providers prescribe an exercise regimen similar to that of a supervised program. • Patient counseling ensures understanding of how to begin and maintain the program and how to progress the difficulty of the walking (by increasing distance or speed). • Program may incorporate behavioral change techniques, such as health coaching or use of activity monitors.
  • 23. CMS Coverage Language for SET for Treatment of Symptomatic PAD 25 • 3-1-2017:“The Centers for Medicare & Medicaid Services (CMS) proposes that the evidence is sufficient to cover supervised exercise therapy (SET) for beneficiaries with intermittent claudication (IC) for the treatment of symptomaticperipheral artery disease (PAD).” • A SET program must include: ̶ Sessions lasting 30–60 minutes comprised of a therapeutic exercise-training program for PAD in patients with claudication • CMS proposes that Medicare Administrative Contractors (MACs) have the discretion to cover SET beyond 36 sessions over 12 weeks and may cover an additional 36 sessions over an extended period of time with a new referral if patients continue to be symptomatic. ̶ Three sessions per week ̶ Up to 12 weeks of sessions ̶ (CPT code: 93668)
  • 24. Reimbursement 26 CPT code: 93668 Payment: for 2018 for on-campus hospital outpatient setting ~$55 per session; recall patient pays for 20% or approximately $11 per session ICD10 Codes: I73.9 Peripheral vascular disease, unspecified I70.20 Unspecified atherosclerosis of native arteries of extremities I70.21 Atherosclerosis of native arteries of extremities w/intermittent claudication I70.22 Atherosclerosis of native arteries of extremities w/rest pain (-) Add 6th character 1 – right leg 2 – leftleg 3 – bilaterallegs NOTE: Always check with your Medicare Administrative Contractor (MAC) for specifics.
  • 25. Our Experience 27 • Two projects that have informed implementation of SET for PAD • PAD PRAIRIE Initiative ̶ Implementing SET for PAD in communities in rural Minnesota • Clinical implementation of SET for PAD throughout the Fairview cardiac rehabilitation centers in the Twin Cities Metropolitan area • This has allowed us to see the “real world” implications of an implementation of a clinical PAD exercise program.
  • 26. Elements Needed 28 Develop ProgrammaticInfrastructure • Identify medical director. • Establish referral process. Make providers aware of availability SET for PAD. ̶ May need changes to electronic health record • Train cardiac rehabilitation staff about how to implement SET for PAD. • Develop implementation process.
  • 27. Baseline Assessment 29 • Functional evaluation ̶ Graded Exercise Test (Gardner; Hiatt; Bronas/Treat-Jacobson) • Peak walking time or distance (PWT/D); claudication onset time or distance (COT/D) ̶ 6-minute walk test ̶ Short Physical Performance Battery ̶ Timed Up and Go (TUG) Test • Subjective assessment ̶ Walking Impairment Questionnaire ̶ Quality of life (PADQOL, VASCUQOL, PAQ) ̶ Functional status (SF-36, PROMIS) • Orient patient to exercise equipment
  • 28. Medical History (check all that applyand explain)  Heart  Other  Lung  Stroke  Depression  Orthopedic Risk Factorsfor CAD (check all that apply)  Weight  Exercise  Stress  HTN  Cholesterol  DM  FamilyHx  Depression Wounds Present: Do you have any wounds on your feet? Yes No Location of wounds: Do you know how to do a foot inspection? Yes No Handout provided? Yes No 30 Pain Screen: Intensity Rating: Location: Onset: Duration of ea. Episode: Precipitating Factors: Alleviating Factors: ABIs: Right Pre Ex: Post Ex: Left Pre Ex: Post Ex: Symptomsof Claudication: Location of Claudication: Stresstest results(if available): Max HR: 85% of max HR: Onset of Claudication: minutes Peak MET Level: Peripheral Artery Disease Supervised Exercise Therapy Evaluation Client Name: MR#: CSN#: Date: DOB/Age: Diagnosis:
  • 29. 6-Minute Walk Test: Initial Date: DischargeDate: Total Time Walked Resting Heart Rate (bpm) Exercise Heart Rate Recovery Heart Rate Resting Blood Pressure (mm Hg) Exercise Blood Pressure Recovery Blood Pressure Claudication Onset Time (COT) Claudication Onset Distance (COD) Total Distance Walked (PWD) Effort Rating (OMNI Scale) O2 Saturation 31 Peripheral Artery Disease Supervised Exercise Therapy Evaluation
  • 30. Peripheral Artery Disease Supervised Exercise Therapy Evaluation Yes No Client Name: MR#: CSN#: FALLS SCREEN (Circle one) Have you fallentwo or more times in the past year? Yes No Have you fallenand had an injury in the past year? Referral toPhysical Therapy? Yes No Evaluation Therapist Signature: Date: Time: Discharging TherapistSignature: Date: Time: Outcomes: Initial Discharge MET level (6 MWT): MET level (6 MWT): MET level (treadmill): MET level (treadmill): TUG Test: 1st: 2nd: TUG Test: 1st: 2nd: 32 Initial MET level (treadmill) is based on third visit. Discharge MET level (treadmill)is based on peak METs achieved at end of program. Goals: 1. 2. Initial Session: Comments: Discharge Summary: GoalsMET: Yes No Comments:
  • 31. Treadmill Walking Exercise • Considered the gold standard for exercise therapy for PAD ̶ Initial prescription (speed and grade of treadmill) is determined by baseline functional testing ̶ Perform a treadmill familiarization to allow the patient to determine preferred walking speed ̶ Training sessions consist of intermittentbouts of walking/resting based on claudication level ̶ Use claudication scale to determine exercise/restcycles 33
  • 32. Claudication Pain Scale 34 ACSM Guidelines for Exercise Testing and Prescription, 2017 0 = no pain 1 = mild pain 2 = moderate pain 3 = intense pain 4 = unbearable pain Resting or early exercise effort 1st feeling of any pain in legs Pain level at which exercise training should cease Nearly maximal pain Most severe pain experienced
  • 33. Claudication Pain Scale Resting or early exercise effort Where patient needs to stop during exercise training 1st feeling of any pain in legs 35 0 = no pain 1 = onset of pain 2 = mild pain 3 = moderate pain 4 = moderate pain 5 = severe pain Stop before you have severe pain.
  • 34. Treadmill Walking Exercise 36 Intensity and Time • Begin at initial speed/grade that brings on claudication within 2–5 minutes. • Walk to bring on claudication. ̶ Make progressive increases in walking time. ̶ Stop and sit when you reach moderate intensity pain. ̶ Resume when pain has completely subsided. ̶ Continually repeat process for total time (walking + resting) of 30–60 minutes. • Make progressive increases in grade and speed over time as walking duration improves.
  • 35. Peripheral Artery Disease Supervised Exercise Therapy Daily Progress Note Diagnosis: Date: / Session #: Blood Sugar: Pre: Post: MODALITY SPEED GRADE TIME ONSETOF PAIN PAIN (0-5 SCALE) OMNI EFFORT RESTTIME OT WORK RestingHeart Rate: Exercise Heart Rate: RestingBloodPressure: ExerciseBloodPressure: Total Exercise Time: Total Rest Time: Total SessionTime: Symptoms BeyondClaudication Pain: Home Exercise: Assessment/Progress: Plan: Signature: Date: Time: 546345 Rev 8/17 Progress Note/Clinic Note Original: Medical Record Page 1 37
  • 36. Session1: Choose a comfortablewalking speedand adjust grade as needed to induce a 3–4/5 claudication within 5–10 minutes. Have participant rest until pain dissipates.Repeatintervals 60 minutes as tolerated. If able to walk continuously for8–10 minutes or more If not able to walk continuously for8–10 minutes Continue progressionscheme until participant is able to walk continuously for 8–10 minutes at a grade of 10%; increase by 0.1 mph next session If patient able to walk continuously for8–10 minutes at more than 3.0 mph and 10% grade Increase grade by 1% NEXT SESSION If able to walk at 15% grade and 3.0 mph, continue increasing mph by 0.1 mph each time individual is able to walk continuously for 8–10 minutes NEXT SESSION If not able to walk continuously for8–10 minutes Continue at the same speed and grade Continue at the same intensity Increase grade by 1% Session 2: Repeat session 1 exercise prescription Treadmill Protocol 38 Treat-Jacobson, Bronas, et al, 2009
  • 37. SET for PAD in the “Real World” • Most PAD exercisetrials have compared treadmill exercise to another condition (procedure, alternative exercise, control). • Patients needed to be able to walk on a treadmill at 2 mph, otherwise they were excluded. • We have found that many PAD patients are not willing or able to walk on a treadmill (balance, discomfort). • Number of treadmills may be limited. • Alternative forms of exercise should be considered. 39
  • 38. SET for PAD in the “Real World” • Try treadmill or other walking exercisefirst. • If unable to perform treadmill exercise or if walking duration is so short that benefit is unlikely, consider alternative mode: ̶ Seated aerobic arm exercise ̶ Recumbent total body stepping (NuStep) ̶ Lower extremity cycling • Encourage the exercise therapists to apply their art and science as they do with cardiac rehabilitation. 40
  • 39. Session 1–6: Initiate UBE-EX at 50–60 rpm; adjust ergometer resistance to promote moderate exertion (RPE 12–13). UBE-EX performed at intervals of 2:2 for entirety of 60-minute session Session 7–12: Progress UBE-EX by increasing work/rest ratio to 3:2; adjust resistance to promote moderate intensity (RPE 12–13) Session 13–30: Progress UBE-EX by gradually increasing work/rest ratios from 3:2 to 5:1 over several weeks. Adjust resistance to promote moderate to vigorous intensity (RPE 13–14) Session 31: Progress UBE-EX by increasing work/rest ratio to 5:1 adjust resistance to promote vigorous intensity (RPE 14–15) PAD PRAIRIE Initiative 41 Arm Ergometry Protocol
  • 40. Progress workload by 1 level Continue at same intensity If patient is able to exercise at workload (level) 10 continuously for 8–10 minutes, increase pace (steps per minute) by 10 If patient is able to exercise continuously for If patient is not able to exercise continuously 8–10 minutes for 8–10 minutes Progress workload by 1 level Continue at same intensity If patient is able to exercise at workload (level) 20 continuously for 8–10 minutes, maintain intensity for remainder of program If patient is able to exercise continuously for 8–10 minutes If patient is not able to exercise continuously for 8–10 minutes PAD PRAIRIE Initiative 42 Total Body Recumbent Stepping Protocol Session 1: Determine comfortable step rate (50–80 steps per minute), adjust resistance (level) that induces 3–4/5 claudication within 5–10 minutes. Have participant rest until pain dissipates. Repeat intervals for entirety of 60-minute session. Session 2: Repeat session 1 exercise prescription
  • 41. 43 Courtesy of Jon Ehrman, PhD Where to put a chair? Someone took my treadmill!!
  • 42. Safety Considerations 44 • Potential to unmask new angina due to increased exercise capability ̶ Follow up on new signs and symptoms of coronary disease • Abrupt increase in claudication symptoms could signal worsening of lower extremity arterial disease ̶ Evaluate for deterioration in limb blood flow
  • 43. Safety Considerations 45 Assess legs and feet for indications of critical limb ischemia. • Ask patient about sores or pain. • If known open sore or pain, assess more often. • Evaluate skin: color, hair, shiny, thin, fragile.
  • 44. Critical Limb Ischemia Dependent rubor Elevation pallor 46
  • 45. Collecting Outcome Data • Not a CMS requirement, but part of “Best Practices” for Cardiac Rehabilitation • Collect same measurements as at baseline • Functional ̶ Change in walking speed and grade ̶ 6 MWT ̶ Graded treadmill test to assess for pain-free and peak walking time ̶ PROMIS or SF-36 questionnaire ̶ WIQ (Walking Impairment Questionnaire) • Quality of Life ̶ PADQOL ̶ VASCUQOL 47
  • 46. Resources 48 • Intake and progress forms being finalized and can be adapted • PAD PRAIRIEwebsite https://www.nursing.umn.edu/research/research-projects/pad- prairie/resources-providers and videos available ̶ Functional Assessment testing • 6-minute walk test • Timed Up and Go Test (TUG) • Short Physical Performance Battery ̶ How to initiate progress a patient in supervised treadmill exercise and aerobic arm exercise • Updated PAD Rehabilitation Toolkit available at no charge on AACVPR website • AHA commissioned a Science Advisory “How to Implement Supervised Exercise Therapy for Patients With Symptomatic Peripheral Artery Disease,” which should be completed in the next six months.