peripheral arterial disease – the new cardiovascular endemic · cardiovascular risk increases...
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Peripheral Arterial Disease – The New Cardiovascular Endemic
Friday April 21st 2017
Osama A. Ibrahim, MD, FACCDirector of PAD, Limb Salvage, and Amputation Prevention Programs
Director of Endovascular Therapies
North Memorial Heart and Vascular Institute
North Memorial Healthcare
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Executive Summary• Peripheral artery disease or PAD commonly refers to the presence of a
stenosis or occlusion in the aorta or arteries of the limbs• Individuals with PAD have an exceptionally elevated risk for cardiovascular
events, and the majority will eventually die of cardiac or cerebrovascular etiology
• Prognosis is correlated with the severity of PAD as measured by the ankle brachial index (ABI)
• General practitioners (e.g., PCP, podiatrists, etc) must be engaged in the diagnosis and management of PAD—it can be life saving
• Early referral to a (cardio)vascular specialist can facilitate optimal risk factor modification and management—this saves lives
• WHEN revascularization is necessary, endovascular therapy for PAD should be considered FIRST-LINE therapy in most cases
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PAD Epidemiology
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• The presence of a stenosis or occlusion in the aorta or arteries of the limbs
• One of the three cardinal manifestations of atherosclerosis in addition to CAD and CVD
• Associated with an increased risk of cardiovascular and cerebrovascular events, including death, MI and stroke
PAD36.9%
CAD
CVD
14.2%9.5%
39.4%
Patients with one manifestation often have coexistent disease in other
vascular beds1
Definition of PAD1,2
CAD=coronary artery disease; CVD=cardiovascular disease; MI=myocardial infarction.1. Bhatt DL et al, on behalf of the REACH Registry Investigators. JAMA 2006; 295(2): 180-189
2. Rooke T et al. 2011 ACCF/AHA focused update of the guideline for the management of patients with peripheral arterial disease (updating the 2005 guideline): a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines.
Circulation. 2011;124:2020–2045.
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Prevalence of PAD
NHANES=National Health and Nutrition Examination Survey.1. Selvin E, Erlinger T. Prevalence of and risk factors for peripheral arterial disease in the United States: results from the National
Health and Nutrition Examination Survey, 1999–2000. Circulation. 2004;110:738–743.2. Criqui M et al. The prevalence of peripheral arterial disease in a defined population. Circulation. 1985;71:510–515.
3. Meijer W et al. Peripheral arterial disease in the elderly: the Rotterdam Study. Arterioscler Thromb Vasc Biol. 1998;18:185–192. 4. Diehm C et al. High prevalence of peripheral arterial disease and co-morbidity in 6880 primary care patients: cross-sectional study.
Atherosclerosis. 2004;172:95–105.5. Hirsch A et al. Peripheral arterial disease detection, awareness, and treatment in primary care. JAMA. 2001;286:1317–1324.
NHANES1
Age >40
0% 5% 10% 15% 20% 25% 30% 35%
PARTNERS5
Age >70 or 50–69 with Diabetes or Smoking29%
San Diego2
Mean Age=66 11.7%
Diehm4
Age ≥65 19.8%
Rotterdam3
Age >5519.1%
NHANES1
Age ≥7014.5%
4.3% When common risk factors were included, the prevalence of PAD
was approximately one-third of patients
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Prevalence
Asymptomatic5 million
Symptomaticuntreated
3.75 millionSymptomatic
treated1.25 million
Pentecost, et al. “Guidelines for Peripheral Percutaneous Transluminal Angioplasty of the Abdominal Aorta and Lower Extremity Vessels”; 1993
Total ~ 10 million U.S. patients
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Dormandy J, Rutherford R; TASC Working Group, TransAtlantic Inter-Society Consensus (TASC). Management of peripheral arterial disease (PAD). J Vasc Surg. 2000;31(1 pt 2):S1–S288.
Risk Factors for PAD
Smoking
Diabetes
Hypertension
Hypercholesterolemia
Hyperhomocysteinemia
Elevated C-Reactive Protein
Reduced
Relative Risk 1 2 3 4 5 60
Increased
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Criqui M et al. Mortality over a period of 10 years in patients with peripheral arterial disease. N Engl J Med. 1992;326:381–386.
10-Year Survival Rates for Patients with PAD
100
75
50
25
02 4 6 8 10 12
Surv
ival
, %
Year
Asymptomatic PADSymptomatic PAD
Normal subjects
Severe symptomatic PAD
0
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>1.1 1.1–1.01 1.0–0.91 0.9–0.71 <0.7
ABI
CHD
Even
t Out
com
es
per Y
ear,
%
0
1
2
3
4
5-year risk:10%
5-year risk:19%
PAD
2%
3.8%
Cardiovascular Risk Increases with Decreases in ABI
Fatal or nonfatal MI. CHD=coronary heart disease (chronic heart failure).
Leng G et al. Use of ankle brachial pressure index to predict cardiovascular events and death: a cohort study. Brit Med J. 1996;313:1440–1444.
Framingham “high risk” = 20 percent at 10 yearsEvery patient with PAD is at “very high risk”
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Clinical Presentation
• Asymtomatic 20-50 %• Atypical leg pain 40-50 %• Classic claudication 10-35 %• Critical limb ischemia 1-2 %
Hirsch, AT et al. ACC/AHA 2005 Practice guidelines for management of patients with PAD, Circ 2006
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Clinical Manifestations of PAD• Patients can be asymptomatic for PAD (up to 50-60% of the time)• Or patients can experience
• Symptoms of intermittent claudication• Discomfort• Aching • Leg cramps with exercise that resolve with rest
• Functional impairment • Slow walking speed, gait disorder
• Rest pain• Pain or paresthesia in foot or toes, worsened by leg elevation and improved by
dependency• Ischemic ulceration and gangrene (Critical Limb Ischemia)
Rooke T et al. 2011 ACCF/AHA focused update of the guideline for the management of patients with peripheral arterial disease (updating the 2005 guideline): a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. Circulation.
2011;124:2020–2045.
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Hirsch, AT et al. ACC/AHA 2005 Practice guidelines for management of patients with PAD, Circ 2006
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Classification of PAD
Dormandy J, Rutherford R; TASC Working Group, TransAtlantic Inter-Society Consensus (TASC). Management of peripheral arterial disease (PAVascSurg. 2000;31(1 pt 2):S1–S2D). J 88.
Fontaine Stages Rutherford CategoriesStage Clinical Grade Category Clinical
I Asymptomatic 0 0 Asymptomatic
IIA Mild claudication I 1 Mild claudication
IIB Moderate-severe claudicationI 2 Moderate claudication
I 3 Severe claudication
III Ischemic rest pain II 4 Ischemic rest pain
IV Ulceration or gangreneIII 5 Minor tissue loss
IV 6 Ulceration or gangrene
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Diagnosis of PAD
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Comprehensive Vascular Examination
• Carotid • Radial/ulnar• Femoral• Popliteal• Dorsalis pedis• Posterior tibial
Pulse* Examination
• Bilateral arm blood pressure• Cardiac exam• Palpation of abdomen
for potential aneurysmal disease
• Auscultation for bruits• Examination of legs and feet
Physical Examination
*Pulse should be assessed and rated on a scale of 0 to 2, where 0 is absent, 1 is diminished and 2 is normalSource: Rutherford’s Textbook of Vascular Surgery, 2005
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• Performed with pants and shoes off
• Limb examination (and comparison with the opposite limb) includes
• Absent or diminished femoral or pedal pulses (especially after exercising the limb)
• Arterial bruits• Hair loss• Poor nail growth (brittle nails)• Dry, scaly, atrophic skin• Dependent rubor
• Pallor with leg elevation after 1 minute at 60° (normal color should return in 10–15 seconds; >40 seconds indicates severe ischemia)
• Ischemic tissue ulceration (punched-out, painful, with little bleeding), gangrene
Physical Examination Findings Suggestive of PAD
Gey D et al. Management of peripheral arterial disease. Am Fam Physician. 2004;69:525–532.
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Diagnosis• ABI with exercise• Dupplex ultrasound• CTA/MRA• Conventional angiography
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Noninvasive Assessments in CAD and PAD Are Similar
Hirsch A et al. ACC/AHA 2005 practice guidelines for the management of patients with peripheral arterial disease (lower extremity, renal, mesenteric, and abdominal aortic): a collaborative report from the American Association for Vascular Surgery/Society for Vascular Surgery, Society
for Cardiovascular Angiography and Interventions, Society for Vascular Medicine and Biology, Society of Interventional Radiology, and the ACC/AHA Task Force on Practice Guidelines (writing committee to develop guidelines for the management of patients with peripheral arterial
disease): endorsed by the American Association of Cardiovascular and Pulmonary Rehabilitation; National Heart, Lung, and Blood Institute; Society for Vascular Nursing; TransAtlantic Inter-Society Consensus; and Vascular Disease Foundation. Circulation. 2006;113:e463–e654.
• Electrocardiogram• Echocardiogram• Stress test• Angiography
CAD
• ABI• PVR, segmental pressures• Treadmill test• DUS, CTA, MRA
PAD
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• The resting ABI should be used to establish the lower extremity PAD diagnosis in patients with suspected lower extremity PAD, defined as individuals
• With exertional leg symptoms• With nonhealing wounds• Who are age ≥65• Or who are age ≥50 with a history of smoking or diabetes
ACCF/AHA 2011 PAD Guidelines Diagnostic Methods: ABI
ACCF=American College of Cardiology Foundation; AHA=American Heart Association.Adapted from Rooke T et al. 2011 ACCF/AHA focused update of the guideline for the management of patients with peripheral arterial disease (updating the 2005 guideline): a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice
Guidelines. Circulation. 2011;124:2020–2045.
I IIA IIB III
B
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ABI =Ankle systolic pressure
Brachial systolic pressure
• Ankle and brachial systolic pressures taken using a hand-held Doppler instrument
• The ABI is 95-percent sensitive, 99-percent specific for PAD
Normal 1.00–1.40Borderline 0.91–0.99PAD ≤0.90Pain/Ulceration ≤0.40Noncompressible ≥1.40
Rooke T et al. 2011 ACCF/AHA focused update of the guideline for the management of patients with peripheral arterial disease (updating the 2005 guideline): a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. Circulation.
2011;124:2020–2045.
Ankle Brachial Index
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Suggested Diagnostic Algorithm for PADHistory, physical
examinationsuggestive of PAD?
Search for alternate diagnosis
PAD
Vascular lab referral:• Segmental
pressures, PVR• Graded treadmill test
Anatomic assessment: DUS, CTA, MRA
ABI
Still suspicious?
<0.9 0.9–1.0 ≥1.40
Yes
No
CTA=computed tomography angiography; DUS=duplex ultrasound; MRA=magnetic resonance angiography; PVR=pulmonary vascular resistance. Source: Sunil Parikh, MD, UHHS
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Advanced Vascular Imaging
CT Angiography
• Maximum-intensity projection (MIPs)
• Angiographic like representation
• Volume rendering• Preserves depth
information
• Multi-planar reformat
• Curved planar reformat (CPR)
• Perpendicular to median arterial centerline
MR Angiography• Traditional: Time of flights• Contrast-enhanced MRA
– Improves speed of exam, anatomic coverage, and small- vessel resolution
• Time-resolved gadolinium enhanced sequences
– Time-resolved imaging of contrast kinetics (TRICKS)
– Provides angiographic like dynamic contrast passage
• Moving-table technique or multi-array, parallel-imaging
– Optimize large field-of-view imaging
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Management
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Medical Therapy and Risk Factor Modification
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Therapies for PADPreventing death, MI, stroke• Antiplatelets
(Pletal/ASA/Plavix/Zontivty)• Cholesterol lowering – statins• Angiotensin-converting enzyme (ACE)
inhibitors
Reducing symptoms• Exercise• Pletal (Cilostazol).• Endovascular interventions• Surgery
Saving limbs• Endovascular interventions• Surgery
Adapted from Rooke T et al. 2011 ACCF/AHA focused update of the guideline for the management of patients with peripheral arterial disease (updating the 2005 guideline): a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice
Guidelines. Circulation. 2011;124:2020–2045.
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Pharmacotherapy• Drugs with evidence of clinical utility in claudication
– Cilostazol [Phosphodiesterase Inhibitor]• Drugs with supporting evidence of clinical utility in claudication
– Carnitine and Propionyl L-Carnitine [skeletal muscle oxidative metabolism]
– Lipid lowering agents• Drugs with insufficient evidence of clinical utility in claudication
– Pentoxifylline– Antithrombotic agents [ASA/plavix]– Vasodilators [CCB/α-adrenergic antagonists/β2-adrenergic
agonists/Papaverine]– 5-hydroxytryptamine antagonist [Ketanserin/Sarpogrelate]– Prostaglandins [PGE1]
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Effects of Exercise on Claudication: Meta-analysis of 21 Studies
200
0
20
40
60
80
100
120
140
160
180
Onset of Claudication Pain
Maximal Claudication Pain
Chan
ge in
Tre
adm
ill W
alki
ng D
ista
nce,
%
Exercise trainingControl
Gardner A, Poehlman E. Exercise rehabilitation programs for the treatment of claudication pain: a meta-analysis. JAMA. 1995;274:975–980.
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Revascularization Options
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1.Interventional Cardiologists (41 percent)2.Vascular surgeons (40 percent)3.Interventional radiologists (19 percent)
Goodney P et al. National trends in lower extremity bypass surgery, endovascular interventions, and major amputations. J Vasc Surg. 2009:50:54–60.
Who Is Doing Peripheral Interventions These Days?
Year
Prop
ortio
n of
All
Endo
vasc
ular
Pro
cedu
res,
%
100
80
60
40
20
020051997 19981996 20021999 20062000 200420032001
10%
23%
67%
40%
41%
19%
Vascular surgeons
Cardiologists
Radiologists
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• Complications • Mortality: 2–5 percent • MI: 1.9–3.4 percent • Hemorrhage: 2 percent • Graft thrombosis: 2–7 percent • Wound infection: 8–19 percent • Surgical revision: >20 percent
PAD: Surgical Revascularization Has Risks
Dormandy J, Rutherford R; TASC Working Group, TransAtlantic Inter-Society Consensus (TASC). Management of peripheral arterial disease (PAD). J Vasc Surg. 2000;31(1 pt 2):S1–S296.
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Aortoiliac (Suprainguinal) Revascularization
• Initial clinical success of PTA for iliac stenosis exceeds 90%.• Approaches 100% success rate with focal iliac lesions.• Technical success of 80-85% for recanalization of long segment
iliac occlusions.• 5 year patency 70-79%• Factors negatively affecting long term patency
– Quality of distal runoffs– Severity of ischemia– Length of diseased segment– Female gender
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CFA/SFA Occlusive Disease• Claudication of thigh, calf or both.• Calf claudication
– Most common complaint– Cramping pain consistently reproduced with exercise
and relieved promptly with rest– Differential Diagnosis
• Nocturnal leg cramps (elderly/nocturnal/rest)• Calf pressure and tightness (athletes/chronic exercise)
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Infrainguinal Revascularization• Endovascular preferred choice of therapy.• Clinical success rate of PTA 95%• Predictors of restenosis
– Length of lesion– Extent of outflow disease– Tobacco abuse
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Tibial/Peroneal Occlusive Disease
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Infrapopliteal Endovascular Revascularization
• Indicated for limb salvage.• Increasing evidence to support a recommendation of
PTA in patients with CLI and Infrapopliteal artery occlusion.
• Controversy remains for PTA versus PTA with stent placement.
• Atherectomy starting to play a significant role.
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Thank You
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Need for Clinical Integration
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Why Now – Patient Population Factors
• Aging population.• Increased prevalence of Diabetics.• Smoking remains a true healthcare nightmare.• High percentage of “Asymptomatic” presentation.
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Why now – Economic Factors
• Cost of Amputation.• Disability claims.• Cost of prosthesis.• High mortality and morbidity associated with amputation.
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Why now – Technical Factors
• Tremendous advancements have been made in the medical device industry allowing for better outcomes and limb salvage.
• A few providers from various disciplines have appropriate training and passion to care for these patients.
• A better understanding of “multidisciplinary” approach to treat these patients.
• All team members are of equal significance/importance to save a limb.
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Where do we start
• Identifying the patients at risk.• Provider and community awareness to this disease.• Enhancing risk factor modification.• Enrolling these patients in surveillance programs.• Enrolling these patients in PAD rehabilitation programs.
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Then what
• Identifying the patients at risk.• DM/Age/Tobacco abuse
• Enhancing risk factor modification.• Consult visit with PAD specialist.
• Enrolling these patients in surveillance programs.• Annual Arterial ABI/Dupplex Ultrasound.
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Then what – Asymptomatic Patient
• If patient asymptomatic;• PAD Consult.• Arterial venous ultrasound.
• Surveillance ultrasounds.• Monitoring of progression of disease state.• PAD Rehabilitation/education.• Supervised exercise walking programs.
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Then what – Symptomatic Patient
• If patient symptomatic;• CTA/Angiogram.• Interventional procedure.• Surgical Bypass.
• Surveillance ultrasounds.• PAD rehabilitation enrollment.• Supervised exercise walking programs.