Supervised Exercise, Stent Revascularization,or Medical Therapy for ClaudicationDue to Aortoiliac Peripheral Artery Disease

Supervised Exercise, Stent Revascularization,
or Medical Therapy for Claudication
Due to Aortoiliac Peripheral Artery Disease
The CLEVER Study
[Claudication: Exercise Versus Endoluminal
Revascularization ]
JOURNAL OF THE AMERICAN COLLEGE OF
CARD IOLOGY
VOL. 65, NO. 10, 2015

BACKGROUND
• Treatment for claudication that is due to
aortoiliac peripheral artery disease (PAD) often
relies on stent revascularization (ST).
• However, supervised exercise (SE) is known to
provide comparable short-term (6-month)
improvements in functional status and quality
of life. [Circulation. 2012 January 3]
• Longer-term outcomes are not known.

• PAD is one of the most prevalent
cardiovascular diseases, affecting up to 5% of
individuals over 55 years of age.[Circulation
2004;110:738–43]
• Clinical trials have demonstrated that
supervised exercise (SE) is an effective
treatment because it significantly improves
walking performance.[JAMA 1995;274:975–
80], and quality of life. [J Vasc Surg 1996;
23:104–15]
• Despite this, access to SE is limited, because
clinicians do not actively prescribe this
claudication treatment.

OBJECTIVES
• To report the longer-term (18-month) efficacy
of SE compared with ST and optimal medical
care (OMC)
• Comparative effectiveness study that
compared outcomes for aortoiliac stenting
(ST) or SE with optimal medical therapy
(OMT) at 6 and 18 months

METHODS
• Randomized, multicenter clinical trial conducted
at 29 centers in the United States and Canada.
• Adults over 40 years of age with moderate-to-
severe claudication that was due to aortoiliac
PAD, who were enrolled between April 24, 2007,
and January 11, 2011.
• A total of 999 patients were screened, 119 were
enrolled, and 79 completed the 18-month follow-
up clinical and treadmill assessment

EXCLUSION CRITERIA
• Individuals with critical limb ischemia or who
had comorbid conditions that limited their
walking ability were excluded

Supervised Exercise, Stent Revascularization,or Medical Therapy for ClaudicationDue to Aortoiliac Peripheral Artery Disease

• Moderate-to-severe claudication: defined as
the ability to walk at least 2 min on a treadmill
at 2 miles per hour at no grade, but <11 min on
a graded treadmill test using the Gardner-
Skinner protocol.
• All subjects were enrolled on the basis of the
presence of at least a 50% diameter stenosis of
the distal aorta or iliac arteries involving the
more symptomatic leg, which was confirmed
by either noninvasive vascular laboratory
testing(n-92) or catheter angiography (n-19)

SUPERVISED EXERCISSE
• SE: It consisted of treadmill walking for up to
78 scheduled exercise sessions that were 1 h
long, 3 days a week, for 6 months.
• Patients in the SE group received quarterly
contact by research coordinators during the
supervised phase, and then participated in a
telephone-based maintenance program
designed to promote exercise adherence during
the unsupervised phase of the study.

• This telephone support system was provided to
SE patients from the beginning of month 7 to
the end of month 18.
• OMC: atherosclerosis risk factor management;
the claudication medication, cilostazol; and
home exercise counseling

ENDPOINTS
• All endpoints were assessed at 6 months and at 18
months.
• Functional status was measured by treadmill
performance measurements that included the
PWT(Peak walking time), and claudication onset
time (COT).
• Three quality-of-life health status measures were
used: the Medical Outcomes Study Short Form-
12, the Walking Impairment Questionnaire
(WIQ), and the Peripheral Artery Questionnaire
(PAQ).

STATISTICALANALYSIS
• All endpoints were analyzed according to the
intention-to-treat principle
• Secondary analyses were performed on a per-
protocol population

RESULTS
• CONCLUSION:(6 MONTHS)SE results in
superior treadmill walking performance than
ST, for those with aortoiliac peripheral artery
disease. The contrast between better walking
performance for SE and better patient-reported
quality of life for ST warrants further study.

TREADMILL WALKING AND
HEMODYNAMIC ENDPOINTS
• PWT at 18 months improved least for OMC
patients (0.2-2.1 min), more for ST (3.2-4.7
min), and most for SE patients (5.0-5.4 min)
between baseline and 18 months

QUALITY OF LIFE
• There were no baseline differences in quality
of life among the treatment groups.
• At 18 months, improvement in disease-specific
scales (WIQ, PAQ) was statistically superior
for ST and SE compared with OMC

DISCUSSION
• The 18-month follow-up results of the
CLEVER study demonstrate a comparable,
clinically important, and durable benefit in
functional status, as measured by the PWT, for
both ST and SE compared with OMC

CONCLUSIONS
• The benefit of SE, a strategy of care that
provides several proven biological benefits
that improve limb muscle strength, efficiency,
and performance, was equal to the invasive
stent strategy and was maintained for a full
year after completion of the supervised
training phase with use of a telephone-based
counseling program.

DIAGNOSIS OF PAD
• Evidence of aortoiliac stenosis involving the most
symptomatic limb was established by either noninvasive
vascular testing (ABI <0.9, thigh-brachial index <1.1,
common femoral artery systolic acceleration time >140
msec) (N=41); duplex ultrasound (doubling of peak systolic
velocity in the aortoiliac segment, combined with an ABI
<0.9) (N=26); or computed tomographic angiography
(N=28) or magnetic resonance angiography (N=5)
confirming at least a 60% stenosis by cross-sectional
imaging test, combined with Doppler ultrasound waveform
analysis (showing biphasic common femoral artery
waveform; or catheter angiography (≥50% stenosis in the
aorta or iliac arteries) (N=19).

Supervised Exercise, Stent Revascularization,or Medical Therapy for ClaudicationDue to Aortoiliac Peripheral Artery Disease

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